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COMMONWEALTH OF AUSTRALIA.

DEPARTMENT OF NATIONAL DEVELOPMENT.

BUREAU OF MINERAL RESOURCES GEOLOGY AND GEOPHYSICS.

RECORDS:

1964/86

PART II

MISCELLANEOUS MINOR CHEMICAL, PETROGRAPHIC AND mNERAGRAPHIC INVESTIGATICNS CARRIED our IN f~HE GEOLOGICAL LABORA'llORY.

JUNE TO DECEMBEJR, 1963.

Compiled by

F. ICousal

The information contained in this report has been obtained by the Department of National Development, as part 'of the policy of the Common­wealth Government, to assist in the exploration and' development of mineral resources. It may not be published in any form or used in a company prospectus without the permission in writing of the Director, Bureau of Mineral Resources, Geology and Geophysics.

, .:j

I-I , ~ .. ,,, .~~

1 •

2.

MISCELLANEOUS MINOR CHEMICAL, PETROGRAPHIC AND MINERAGRAPHIC INVESTIGATIONS CiffiRIED OUT IN THE GEOLOGICAL LABORATORY.

JUNE TO DECEMBillR, 1963.

Compiled by F. Kousal.

PART II. ffi:JCORDS 1964/86.

CONTENTS.

Sp0ctrographic analysis of samples from Wabag, T.P.N.G. by D.J.Howard.

Spoctrographic analysis of soil samples from Rum Jungle, N.T. by E.J. Howard.

3. Spectrochemical analysis of geochemical samples from Rum Jungle,N.T. by E.J.Howard.

-4.

6.

Spectrograthic analysis Popondetta, Papua.

Estimation of phosphate Basin, N.T.

Spectrographic analysis

of stream sediment. samples from Safia -by II:.J.Howa.rd.

on core samples from Rum Jungle and Amadeus by S. Baker.

of geochemical samples from Dobbyn, Queensland. by E.J.Howard.

1. Analysis of water samples from the Australian Capital Territory. by S. Baker.

8. Identification of core from Ooramina No.1 :Bore. by E.J • Howard and S.Goadby.

9. Somcrsby Sandstone. by W.Oldershaw.

10. Analysis of phosphato samples from Rum Jungle. N.T. by S. Baker.

11-

12.

White Bundanoon Sandstone. by W.Oldershaw. Water analysis, A.C.T. samplos. by S. Baker.

13. The petrography and goochemistry of thro~ specimens from the Gordon Downs area, Western l~ustralia. by W.R.Morgan, E.J • Howard and S. Baker.

14. Spectrographic analysis of samples from Rum Jungle, Northern Territory. by E.J.Howard.

15. Spectrochemical ~J:'ysis of geochemical sample s from Ingharil, Q,ueensland. by E.J.Howard.

16. Spectrographic analysis of stream sediments from Mount Garnet,Q,ueensland. by E •. T • Howard ,

11. Spectrographic analysis of geochemical samples from Rum Jungle, N.T. by E.J.Howard.

18. Spectrographic analysis of samplo.s from Rum Jungle, N.T. by E.J. Howard,

19. Spectrographic analysis of diamond drill core samples from Tennant Creek. Northern Territory. by E.J.Howard.

20. Spectrogra.phic analysis of geochemical samples from Rum Jungle, lit.T. by E.J.Howard.

21. Spectrographic analysis of geoch00ical samples fron Run Jungle, N.T. by E.J.Howard.

22. The petrography of sheared gr0ywacke from tho Pine Croek area, N.T. by W.R. Morgan.

23. Spoctrochemical anclysis of saL1plos froe Run Jungle, N.T. by E.J.Howard.

24. Mineragraphic description of minoralization in Run Jungle coro, Drill Hole D.G. 24. by I.R.Pontifex.

The inforoation contained in this report has been obtained by the Department of National Developtl0nt, as part of the policy of tho COt'Llonwealth Govornment, to assist in the exploration and development of oineral resources. It may not be published in any fOrL1 or usod in a conpany prospectus without the peroission in writing of tho Director, Bureau of Mineral Resources, Geology and Geophysics.

• " ' . \

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ii

\ [ ) /

SPECTROGRAPHIC ANALYSIS OF S.AMPLES FROM WAEAG TNG • . by

E.J. Howard

Semiquanti"tntive estimations were made of the nickel, cobalt, copper, vanadium, moltbdenum, tin, load and beryllium content of stream sediment samples from vlabag W'G. The samples were submitted by F. Dekker.

The following results are expressed in parts per million.

Sample No. Ni Co Cu V Mo Pb

F1 20 20 20 70 a a

F2 15 15 10 50 a 5 F5 20 20 20 150 a 5 F10 15 20 15 100 a a

F13 10 15 10 50 a a

F16 5- 20 30 150 a 5 F17 20 20 30 150 a 5 F18 10 15 15 30 a 5 F20 15 20 20 150 a a

F24 20 15 15 100 a a

F25 20 15 15 to ~ a ''':'''''

F27 20 15 20 70 a 5 F30 20 15 20 70 a a

F31 20 20 20 70 a a

~'35( 1) 15 15 15 50 a a

F35(2) 20 20 20 100 n. 5 F39 20 15 20 50 a 5 F42 20 ,20 15 70 a 5 F53 10 15 'L5 70 a 5 F56 5- 15 10 100 a a

F57 5- 15 10 100 a a

F59 5- 15 15 70 a a

F60 5- 15 10 70 a a

:&'63 15 15 15 50 a 10

F509 60 30 30 70 a 5-F537 80 30 30 150 a 5 F544 60 20 50 150 a 5 F512 60 30 30 200 a a

F548 30 30 20 200 a a

F549 30 20 20 70 a 5 F589 60 20 20 100 a a

F511 30 20 10 200 a a

F7 40 20 20 150 a 5 F550 30 20 20 100 a 5 F515 80 30 30 100 a 5 F506 60 20 20 100 a a

Serial No. Ni Co Cu V Mo Pb

F539 40 20 30 150 a 5 J?504 40 30 20 200 a -8

F529 30 20 20 100 a a

F544 40 30 20 150 a 10

F517 40 40 30 200 a a

F584 20 30 20 300 a a

F585 10 15 20 70 a 5 F586 15 20 20 70 a a

F587 15 20 30 150 a 8

F588 30 20 20 50 a 5 F502 15 30 30 300 a a

F503 60 40 30 100 a a

F513 60 30 20 100 8 a

F52 - Insufficient sample for analysis.

Tin and beryllium were not detected in any sample. ~

- Plate Nos. 504, 505, 506. ", Lab. serial No. 1069.

.'

..

~,

,

Spectrographic Analysis of Soil Samples from Rum Jungle, Northern Territory

by

E.J. Howard

Semiquantitative estimations were made of the trace metal content of ten soil samples from United Uranium Fenton prospect, Rum Jungle, N.T.

The samples were submitted by A.L. Mather.

The following results are expressed in parts per million.

Sample No. Ni Co Cu V Mo Sn Pb Remarks uu - F1 5 20 25 30 a 10 20 UU - F2 10 20 15 30 a a 20

UU - F3 5- 5- 20 20 a a 20

UU - F4 5- 7 20 30 a a 20

uu- F5 5- 5- 20 200 5 a 20

UU - F6 7 10 10 20 a 20 a

uu '- F7 5- 5- 15 20 a 20 a

UU - F8 5- 5 25 20 a 200 a

UU - F9 5 5- 200 5- a a 5000+ Zn( 5000) ,Ag,

uu- F10 7 20 25 30 a a 50

Be, P and Li were not detected in any sample.

Plate No.661

Lab.Serial No. 1283.

As

i

.. ·e

230

SPECTROCfIDUCA.L ANALYSIS OF GIDCHEMICAL SAMPLES FROM HUM JUNGLE , IiI. T •

by

E.J. Howard

Semi <luanti tiative estj.matione were rr;ade of the trace reetal samples from Rum Jungle, N .T.

content ·of

The samples were submitted by P. Pritchard as part of the geochemical survey of the area.

The following are the results expressod in pal·ts per million.

Mt. Fitch

Holo No. Depth (ft) Ni Co Cu V Mo Pb

5244 6-10 1000 1500 300 500 70 150

·5245 4-12 1000 500 100 100 5 10

5246 6-16 700 1500 500 200 70 100

5247 4-8 150 80 70 300 15 100

5248 4-12 300 150 20 200 a 20

5249 6-10 150 60 70 200 15 100

5250 0-2 60 30 100 300 20 50

5251 4-14 40 20 100 300 15 70

5252 6-10 200 100 500 200 a 50

5253 6",:,,10 500 200 1500 200 10 70

5254 6-10 1000 1000 1500 5 10 150

5255 6-10 700 700 700 20 a 10

5256 6-10 1000 1000 1000 30 15 50

5257 6-10 80 60 200 5- 5 20

5258 6-12 100 100 300 5- a 30

5259 6-10 200 40 150 200 a 50

5260 4-10 150 40 300 200 a 50

5261 6-10 150 40 500 200 10 500

5262 4-10 100 40 500 150 a 300

5~63 6-10 100 60 150 150 a 50

. 5264 4-10 100 40 200 100 5 100

5266 6-10 500 150 300 300 30 50

5267 6-10 1000 300 500 100 5 20

''-''\5268 2-10 700 300 700 500 a 20 ··\(43ON/117E)

5268 6-10 (115E/43ON)

40 15 100 30 a 200

5269 2-10 10 10 50 5 a 150 ~.

5270 4-12 30 20 150 10 5 30

5271 4-12 60 40 150 5 5 30

5272 4-6 150 100 700 5 10 a

,,-' - _ ... - . . ~-.----.-

Hole No.

5274

5275

5276

5277

5278

5279

5280

5281

5282

5283

5284

5285

5286

_ 5287

5288

5289

5290

5291

5292

5293

5294

5295

5296

5297

5298

5299

5300

5301

5302

5303

5304

5305

5306

5307

5308

5309

5310

5311

5312

5313

5314

5315

5316

Depth-- (.ft } .. .--- Ni

2-10 300

2-10

6-10

4-10

4-10

4-10

4-10

4-10

4-12

4-14

10-16

4-6

6-10

6-10

4-10

8-16

6-8

6-10

6-10

8-12

8-10

2-10

4-10

6-10

6-10

6-10

6-10

6-10

4-6

8-10

6-10

6-16

4-10

4-10

2-10

4-10

6-10

4-10

4-8

8-10

6-10

6-19

300

200

10

10

10

100

100

150

200

200

150

300

300

100

80

80

40

150

300

300

150

60

500

150

500

700

1500

100

30

15

40

·40

15

200

100

100

100

60

100

1000

100

150

2. I

Co

100

150

80

10

10

10

150

60

200

150

500

150

300

100

80

60

150

100

200

.300

150

100

40

200

150

700

700

100

100

60

40

80 .

80

30

200

150

60

80

60

100

1000

40

150

Cu V

2000 10

3000 5-

1500 5-70 30

50 30

30 50

700 200

500 100

500 50

300 30

1000 100

700 20

1500 200

1000 200

1000 50

1500 30

700 10

100 10

500 50

300 150

200 200

10 150

100 100

100 100

500 10

700 10

1000 10

5000 100

150 150

100 150

10 100

300 100

500 50

150 50

1000 70

700 30

500 50

500 50

10 200

10 70

1000 50

500 20

500 30

Mo

7

5 a

a

n

5 7

20

15

20

70

10

a

a

a

15

10

15

70

10

5 a

10

15

20

30

100

5 a

a

15

a

n

a

a

a

10

15

15

50

a

Pb

10

20

a

20

30

150

200

30

50

30

200

50

50

20

a

a.

30

20

100

200

300

100

20

20

100

200

200

300

30

20

20

100

1000

20

20

10

10

10

20

50

700

10

10

·'

,

Hole No.

5317

5318

5319

5320

5321

5322

5323

5324

S325 5326

5327

5328

5329

5330

5331

5332

5333

5334

5335

5336

5337

5338

5339

5340

5341

5342

5343

5344

5345

5346

5347

5348

5349

5350

5351

5352

5353

5354

5.355

5356

5357

5358

5364

. Depth (ft)

8-10

4"'10

4-10

0-4

6-10

4-10

8-14

6-14

6-10

4-10

4-10

6-10

6-14

6-10

.4-10

6-10

4-10

4-10

4-10

4-10

6-16

4-10

2-10

4-8

4-10

2-10

6-8

4-10

2-10

8-10

6-10

6-10

8-10

6-8

10-12

4-8

4-10

8-10

4-6

8-10

4-10

4-10

6-10

Ni

100

80

150

100

150

60

80

100

150 200

15

150

40

60

15

40 10c)

200

30

1.5 20

30

60

150

150

60

150

150 100

10

80

30

80 60

40

40

100

20

100

20

60

150

30

3.

Co

200

150

80

100

150

80

60

80

100

500

20

150

40

100

30

30.

150

5CiO

150

15 100

80

150

100

80

60

80

200

150

20

150

40

100

150 60

30

100

30

100

30

80

80

60

Cu V

150 5-

200 50

300 100

1000 20

5000+ 5-

100 20

300 20

150 20

70 20

2000 150

100 10

1000 50

100 5 150 70

50 50 100 20

50 30

500 20

100

100

500

70

500

300

150

500

1000

100

700

50

700

150

300

200

150

50c)

700

70

150

50

70

700

70

5-5-

30

20

10

10

50

7''''' ,-I

50

20

50

20

20

30

70

50

20

30

5 10

10

5 5

5 5-

Mo

a

30

70

10

10

50

30

20

50

50

5 50

5 10

10

15 a

a

a

a

a

a

a

a

10

20

10

a

a

5 a

a

a

30

20

5 a

2

50 a

a

a

a

Pb

20

30

150

10

10

30

10

50

50

50

10

150

10

20

20

20

10

10

10

20

20

20

10

10

10

30

i n '-'

10

20

30

70 20

200

50 20

10

10

20

70

50

50

30

500

.. '-- .,.--- .. -.

~l,. / .

.,

Hole No.

5359 5360

5361

5362

5363

5365

5366

5367

5368

5369

5370

5371

5372

5373

5374

5375

5376

5377

5378

5379 5380

5381

5382

5383

5384

5385

5386

5387

Dep"th (ft)

2-6

4-10

4-10

6-10

6-10

4-10

6-10

6-10

8-10

8-10

6-10

8-10

4-10

2-8

4-10 8-10

8-10

6-10

8-10

8-10

6-10

6-10

4-10

4-10

8-10

4-10

4-10

6-10

Brown's Intermediate

4083

4084

4085

4085

4085 4086

4087

4088

4089

4090

4091

4092

4093

6-18

12-32

6-8

14-22

6-14

10-54

4-12

10-48

18-42

12-28

16-52

16-42

18-48

Ni

40

80

30

40

5 20

. 20

30

30

60

20

20

20

30

5 30

6Q

11)

30

15 20

5-5-

15 40

5-5-

20

Co

40 8(t.

80

40

15 20

20

30

20

30

10

10

10

15

5-15 60

20

20

15

30

5-20

20

60

15

5-40

150 40

fD 30

5- 15 15 20

5- 5-500 1000

500

30 20

15

15

15 200

2000+

100

40

5-15 30

700

Cu

200

500 200

200

30

100

50

50

50 200

100

70 100

100

20

150

50 20

20

30 20

20

10

10

50 10

5 50

2000

2000

30

50 30

5000+

v

7 5-5

10

5 5-5 5-

5 10

70

70 20

5 50 20

5 10

5 5 5 5 5

5-10

5 5-5-

100

100

70 100

70

50

5000+ 50

3000 150

1500 200

10 50

70 50 500 100

5000 50

Mo

2

2

a

2

a

a

a

a

2

a

10

a

2

2

5 2

2

5 2 a

a

a

a

2

5 a

a

a

5 30

15

15 10

5 5

30

5 10

10

30

5

Pb

20

50

70 1000

50 100

10

500

70

500

1500

100

70 20

50 300

200

70

30

30

70 20

20

50

70 20

10

200

10

30

70 100

70

50

50

50 100

70 20

10

20

, I

•

Hole No. Depth (ft)

4094 4-12

4082 BoH

4081 8 1

4075

4070 BoH

4036 BoH 52' 4024 BoH

4023 BoH

4021 BoH

4013 BoH

4012 BoH (619m-r/165U)

4012 BoH ( 6190vl/160N)

4011 BoH

Mt. Burton-Mt. Fitch

4110

4111

4112

4113

4114

4115

4116

4117

4118

4118

4119

4119

Brown I s ~lest

4371

4371

4372

43.73

4374

4375 (114W/16S)

4350

4351

4352

4353

4354

4355 4356

BoH

BoH

8-16

BoH

BaH

14-26·

26-40

20-28

BoH

30-40

36-40

BoH

21l-15

15-25

5-20

5-10

7~-18

7ia-28 5 -17 5-18

5-18

12~18

5-21

7-fz-8

7~30

7i-18

Ni

20

150

eo

1 )i)

30

40

20

5-5-

5-

5-

15

10

10

20

20

5-15

10

15

60

10

30

30

20

30

20

150

5·· 5-5-5-5-

5

5-5-5-

5.

Co

15

700

150

300

300

100

60

60

30

5-5-

5-

5-)-

5-5-5

5-20

10

5 30

10

40

10

10

10

·10

100

5-5-5-5-5-10

5-5-5-

Cu

100

3000

~,OO

'j '500

2000

700

5000

5000+

1000

10

50

50

30

10

5 5

20

20

5 50

20

30

30

20

20

30 20.

30

,0 :5 5

10

10

10

10

20

5 10

v

5-150

20

30

50

50

100

70

100

100

50

10

50

5 150

20

50

70

70

50

50

150

30

30

70

100

100

5 10

5-10 5-

70

70

30

5-100

10

70

Mo

a

20

2

5 2

20

"!O

20

15 20

30

20

10

a

a

a

7 10

15

a

2

10

a

a

a

5 10

5

5 2 2

10

15

5 2

20

7 10

5

Pb

10

50

10

10

20

10

20

20

20

10

10

20

20

a

5 a

5. 10

10

5 10

10

a

a

a

10

20

20

a

a

10 5

10

20

10

a

5

5 150

'~ t 6.

"Hole .No. Depth (ft) Ni Co Cu V l~Io Pb

4357 Bulk 10 5- 15 50 7 300

4358 15-28 200 :6) 20 10 a 5

4358 red clay 50 J) .30 5- a a

4359 Bulk 5- j- : '.J 50 15 70

4360. 10-18 . 5- 5- ~ t·) !I .. I 100 20 20

4361 5-15 5-- 5- 10 70 15 10

4362 5-25 300 (jO 30 30 a a

4363 17~'-40 5- 30 10 30 a a

4364 17~-28 4"0 20 15 50 a 5

4365 5-15 5- 5- 10 100 20 20

4366 7~-15 5- 5- 15 1~O 30 10

4367 5-20 30 20 10 20 a .. 5

436S 7-~~18 20 15 10 50 2 10

4369 2~-25 15 10 5 5- a 10

4330 7t-18 15 5 20 50 7 100

4331 7i-15 30 20 15 5- a 5 4332 7~'-15 5- 5- 15 100 20 1000

~

4333 5-12i 5- 5- 15 100 15 70

, J 4334 7t-23 10 5 20 50 10 2000 •

4335 5-15 5- 5- 15 150 15 200

4336 20-32tt 60 30 15 5- a 10

4337 12~35 80 40 20 10 a 5 4338 221a-35 200 60 50 50 a a

4339 2i-10 5- 5- 10 70 a 70

4340 1 ?;.t-25 100 40 70 70 a a

4341 5-45 150 80 50 20 a 5 4342 15-38 30 20 20 20 a a

4343 171 100 30 50 20 a a

4343 10-37* 200 80 50 5 a a

4344 7i-28 5 5- 20 70 10 10

4345 5-15 20 5- 20 50 5 20

4346 7~ 23 15 5 15 5- 2 20

4347 5-25 5 5- 5 5- a a

4348 7~ 18 60 10 15 50 2 10

4349 15 500 80 70 30 a a ,

Tin, beryllium and phosphorus were not detected in any sample.

Spec. plate Nos. 478-487.

,-

, . ..

Report No. File No~ L.R.R.R. C.S.I.R.O.

Spectrographic Analysis of Stream Sediment Samples from Safia-Popondetta, Papua

by E.J. Howard

B.P. Ruxton submitted twenty one samples of stream sediments from Safia-Popondetta, Papua for spec"t:J?ographic analysis.

The following results are expressed in parts per million.

Sample No. Ni Co Cu V Pb Remarks 1 500 150 25 700 a

2 500 -- 50 300 a

3. 300 &.) 40 300 a

4 10 20 25 200 a

5 30 20 15 500 10

6 40 40 150 500 200 Mo 5

7 12 15 10 150 100 Mo 5

9 30 30 15 500 20

10 10 15 40 150 20

11 700 100 100 500 a

12 150 70 15 500 a

13 30 40 15 500 a

14 12 15 50 100 20

15 300 80 20 200 a

16 100 40 20 500 a

i'7 500 100 15 100 a

18 300 80 100 200 a

19 150 40 50 200 a

20 500 60 100 300 a

21 30 20 10 200 20

22 200 60 100 500 a

Sn, Be, P vlere sought but not detected in any sample.

Lab. Serial No. 1350

Plate Nos. 692, 693

-'.

Report No. B4NT/1

ESTIMATION OF PHOSPHArrE ON CORE SAMPLES FROM RUM JUNGLE AND AMADEUS BASIN

by

s. Baker

Following are results for the determination of phosphate on 116 core samples from Rum Jungle and Amadeus Basin, N.T. submitted by P. Pritchard.

Drill Hole R1~ (Rum Jun~le) Drill Hole R1:2 (Rum Jun~le) percent P205 percent P205

15'-20'C 11.6 15'-20'C 5·7 20'-25' 16.0 20'-25'C 17.3 25'--30'C 26.5 20'-25'F 20.0 25B-30'F 27.0 25'-30'C 27.0 3O'-35'C 26.5 25'-30'F 27.0 30'-35 t F 27.0 30'-35'C 12·5 35'-40'0 26.5 30'-35'F 15.3 35'-40'F 30.0 35'-40'C 4.0

. 40'-45'C 17.0 35'-40'F 1.6 45'-50' 0' 9.0

'.t 45'-50'F 13.3

Drill Hole R30 (Rum Jungle)

percent P20S percent P20!2

0'-5'C less than 1.0 25'-30'F 1.6 0'-5IF " " 1.0 30'-35'C 2.B 5'-10'C " 11 1.0 30'-35'F 5·0 S'-10'F " " 1.0 35'-40'0 3.3 10'-15'0 1.6 35'-40'F 3.2 10'-15 Ill' 2.3 40'-45'0 2.0 15'-20'C 2.7 40'-45'F 2.2 15' -20'F" 3.3 50'-55'0 4.7 20t-25'C 3.0 50'-55'F 4.7 20'-25'F 2.7 55'-60'C '5.5 25'-30'C 3.3 55'-60 f F 5.6 60 ' -65'C 6.2 115'-120'C 1.3 60'-65'F 9.0 115'-120'F 1.0 65'-70'C 11.4 120' -125"C 3.2 70'-75'C 6.6 120'-125'F 3.0 70 t -751F 5.0 130'-135'C 1.5 75'-BOIC 7.0 135'-140'C 3.0

!! 75'-BO'F 5.0 140'-145'C 2.0 BOI-B5'C 4.0 140'-145'F 1.7

• B01_B5'F 3'.6 145'-150'C 1.7

2.

Drill Hole R30 (Rum Jungle) (Cont.)

percent P205 Percent P205.

85'-90'C 2.7 150'-155'C , I . •

, 1.5

85'-90'F 1 • '7 150'-155'F 1.4 90,' "'9:)1 c 2.8 155'-160'C 2.5

90 i -95'F 2.0 155'-160'F 2.8

95'-100'C 1.6 160'-165'C 2.8

95'-100'F 1.0 160'-165'F 1.3 . 100'-105'C 1.5 165'-170'0 2.0

100'-105'F 1.0 165'-170'F 1.2

105'-110'C 1.5 170'-175'C 2.8

105'-110'F 1.4 170'-175'F 1.1 110'-115'C 1.7 175'-180' C 2.2

110'-115'F 1.0 175'-180'F 2.8

Drill Hole API {Amadeus Basin) percent P205 percent P,0:2

83'7"-83'8" 3.0 9287t"-93'1" 1.0 83'8"-84' 8.8 93'1"-93'5" 5.2 84'1"-84'4" 3.0 93'5"-94' 1.0 84'11"-87' less than 1.0 94'-94'2" 9.2 -

r 87'-87'6" less than 1.0 94'2"-94'4" 2.7 87'6"-87'11" less than 1.0 94'4"-95'4" less than 1.0 87'11"-88'5" 2.0 94'4"-96'1" 1.3 88'5"-89'7" 1.0 96'1"-97'3" less than 1.0 89'7"-90'7" less than 1.0 97'3"-97'4" 4.7 90' 7"-90' 10" 9.5 97'4"-98'11" 1 .1 90 i 10"-92'3" 1.0 98'11"-99' 1.4 92'3"-92 i 7" 1.0

99'-99'10" 1.2

99'10"-100' 1~-" 11.0 l 100' 12 "-100' 5'2-" 1.3

100'5~"-100'6t" 6.2 100' 6-~"-101' 22 " less than 1.0 101' 2i"-101' si" 11.3 101'5'2"-102'311 less than 1.0 102'3"-103' " " 1.0 103'-103'5" " " 1.0

Serial No. 1122

,"

Spectrographic Analysis of Geochemical Samples from Dobbyn, Qld.

by

E.J. Howard.

153/Q/1

Semiquantitative estimations were made of the trace metal content of 26 geochemical samples from Dobbyn, Qld.' The samples were submitted by D.O. Zimmerman.

million:

Sample No.

DDS 1

2

3 4

5 6

7 8

9 10

1 1

12

13 14

15 16 17 18

19 20

21

22

23

24 25 26

The following results are expressed in parts per

Ni -5-5-5-5-5-5-5-5-5-5-5-5-5-5-

15

5-5-5-5-5-5-5-5-5-5-5-

Co 10

5 10

5 5 5

10

5

Cu

25

5 5-7

7 15 20

10

y. 20

50

30 20

30

30 30

50 5 10 50 7 15 50 5 7 50

5 7 50 5 10 100

15 5 80 10 10 50

10 5- 50

5 5- 50 7 5- 100

10 7 30 12 10 50

5- 20 30

5 5 20 7 10 30

7 5 30

5 7

15

5-30 50

Zn, Mo, Sn, Pb, Be and P were not detected in any sample.

Plate Nos 660, 661 Lab Serial No. 1375.

16'

:

Report No.

Analysis of Water Samples from the AiC.T.

by

S. Baker Following are results for the Analysis of Bore Water Samples, submitted by G.M. Burton:

City No. 4 City No.6 Hall No.12 Conductivity (micromhos/cm) 980 600 ) 1020 pH 7.7 7.3 7.0 Cl (p. p.m) 125(3.52) 100(2.82) 90(2.54) HC0

3 (P.p.m) 290(4.75) 177(2.90) 750(12.3) S04 (p.p.m) 11 O( 2.29) aO(0.62) 124-(2.58) Ca (p.p.m~ 30(1 .. 50) 64(3.19) 128(6.39) Mg (p.p.m) . 54(4.44) 22(1.81) 71(5.84) Na (p.p.m) 110(4.78) 30(1.)0) 124(5.39)

T.D.S 560 340 900

Figures in brackets refer to m.s./litre. Serial No. 1391

Report No.

Estimation of Phosphate on Samples of Black Shaie from Queensland. by

S. Baker

Following are results for the analysis for phosphate on Black Shale samples from Baralaba, Q'ld, submitted by F. Olgers.

Field No. Percent P205 BA 898 less than 1.0 BA 858/3 less than 1 .0 BA 750 less than 1 .0 B.A: 914 less than 1.0 BA 889 less than 1.0 BA 888 27.0

Serial No. 1384, 1385.

'i

File No. 62/1132

IDENTIFICATION OF CORE

FROM OORAMINNA NO. 1 BORE

by

E. J. Howard & S. Goadby

A sample of core, described as evaporite, was submitted

by J. N. Casey for chemical checking and identification.

Details of the sample locality are Ooraminna No. 1 Bore

25 ml.S.E. of Alice Springs, Northern Territory (1:250,000

International Series F53/14), depth 6085 ft.

Chemical tests and X-ray diffraction showed the sample

consisted mainly of halite with minor calcite, gypsum and.

clay. Trace elements were limited to those normally found

in evaporites.

---------------

Report No.

SPECTROGRAPHIC ANALYSIS OF CUTTINGS FROM WATER BORE, KERRIDY WATERHOLE, NORTHERN TERRITORY.

by E. J. Howard

Three samples from water bore No. F 52/12-44 were submitted by T. Quinlan for spectrographic analysis.

The following results were obtained:

Depth Ni Co Cu V Pb 100-110 feet 10 15 15 10 100 130-140 feet 15 15 15 10 100 180-185 feet 15 15 20 10 200

The above results are expressed in parts per million.

Zinc (100 p.p.m.), gold (10 p.p.m.), silver (2 p.p.m.) were not detected in any sample. Manganese was present in all three samples

Spectrographic Plate No. 530

Lab. Serial No. 1121

-----~------------"

_.4

=

Report No.

SOMERSBY SANDSTONE " -

by

IV. Older shaw

187ACT/1 29/7/63

A sample of white Somersby Sandstone was submitted for petrographic examination to determine its suitability for use as a facing stone on the new Bureau of Mineral Resources building.

The sample is a homogeneous even-grained pale grey sandstone containing scattered glistening flakes of white mica and black specks of biotite and graphite. No bedding, colour banding, stains or other blemishes were seen on the sample.

Under the microscope the sandstone is seen to consist of closely packed sub-roundod grains of Quartz, 0.3 nun. to 0.6 mm. across,/ cemented togethor by ... thin discontinuous pellicles of secondary Quartz and set in a sparse matrix of stained illite and chlorite comprising 27 percent of the rock.

'C' There are a few small grains of epidote, zircon and hematite, contorted stained flakos of mica and irregularly shaped masses of graphite.

There has beon extensive solution and deposition of quartz along tho boundaries of many contiguous Quartz grains; these grains have sutured or intergrown contacts and are thus "welded" together. Many of the grains are also enveloped by thin pellicles of secondary quartz which are continuous with the thin pellicles round other quartz grains. 'l'hus many of the quartz grains have been w'elded together and many have been oemented together by the solution and deposition of seconds.ry Quartz.

Tho clay matrix between the quartz grains consists of micromosaics, felted masses and intergrown flakes of illite, chlorite and a little kaolin. The chlorite is olive green and the illite is limonite stained.

This sandstone has been used on the Fisher Library in Sydney. It appears to be a competent facing stone and is unaffected by the atmosphere; though it may darken slightly on oxposuro unless sealod with a silicono seal. There is a faint colour banding in S011e samplos and care must be taken to select sui table slabs of similar appearance for prominent positions.

COMPARIOON OF COlvlPOSITION .AND SOME PHYSICAL PROPERTIES

Grains Cement Quartz Others Clay Silica Carbonate SpeCific Porosity Matr:i.x Gravity

Somersby 66 1 27 6 2.47 10 ± 2% Gosforo 54 3 37 2 5 2.4 14 ± 2%

64NT/1 Report No~

ANALYSIS OF PHOSPHATE S.UVIPLES FROM RLmJUNGLE

by

S. Baker

Following are results for the estimation of Phosphate on briii Core Samp'les from Rum JUngle; submitted by P. Pritchard.

R 62 (Coarse)

15-20 20-25 25-30 20-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70 70-75 75-80 80-85 85-90 90-95 95-100

100-105 105-110 110-115 115-120

Serial No. 1258

Percent + P205 5.0

13.0 11.0 ·20.0 11.0 4.5 9.0 8.2 9.0 .7.0 6.5 5.5 7.0 5.7 5.4 4.0 5.4 3.5 4.0 1. 2 3.2

II'

Report No.

WHITE BUNDANOON SA'N'DSrrmm

by

w. Oldershaw

187/ACT/1 24/7/63

A sample of white Bundanoon Sandstone was submitted by ·A.G. and A.M.Morris of Tumut, for examin~tion to determine its suitability for use as a facing stone on the second stage of tho Royal Mint.

The sample is a homogeneous~ even-grained~ wh1.te~ clayey sandstone containing a few scattered flakes of white mica and blaok biotite; no iron stains, bi:mding or other blemishes wero $eon. The sample had matured for about a month and was quite hard, in that it was difficult to remove grains fron the surface by rubbing~ or to break off th:) edges. However, before a thin section could be prepared from the srunpl(~ it had to be impregnated Irlth Canada Bnls&~. The rock is not affected by acid. Its hardness, density and porosity are similar to other woll known clayey sandstono building stonos (see table).

Under tho nicroscope the rock is seen to consist of quite closely packed irrogularly shaped grains and angu18.r fro,gr.1cmts of quartz, ranging fron 0.2 to"0.4 nnn. across~ partly cementod togother by socondary quartz and sot in a clay matrix which comprises 33 percent of the rock.

No felspar grains were found. Thore are a few small grains of zircon 9 epidote, henatito and fl~es of Duscovito and biotite.

The marginal parts of many quartz grains in contact with other quartz grains havo boen dissolved and re-crystallized; thus some quartz grains have sutured cont.;wts and have boen IIweldod ti togothor. Each quartz grain is surround.od by a thin pellicle of secondary quartz, and SOIDe of these pelliclos join tho pelliclos around other grains, thus comenting thOD togethor.

Tho cleW matrivc. betwoen the quartz grains consists of about 70 percen t kaolinite and 30 percent illito. The kaolinite occurs as masses of mir1Uto colourless hoxagonal accordeon-like plates, whereas thG illi to forms wisps and intorgrown mosaics. These are small irregularly shaped patchos of lilJ.onito dust scattorod through tho matrix~ SOLlO of whicl: is faintly limonite stained.

Stono from the quarry, from which th8 sClL1plo w"s taken, has boon used for numerous buildings in tho area~ e.g. - the Courthouse and the Jail at Goulb01.U'n~ andtho Mount Carmol Convent in Yass. Tho stone seGms to have been satisfactory; it hardens up on exposure and seoms quite durable and unaffected by tho atmosphero. Tho colour appears to be constant 9 but it would be advisablo to inspect the buildings listed above to see if there has beon any significant colour c.hangcs with weathering. It Vlould also be advisable to inspoct tho quarry to soe if there is an ~doquato supply of :.h..c: good 9 knovm stone. '"" - ,"::". ::~'~." ... .',:: ..... : ".:.: - "'::.:,.:._ 4 .: ;.:'.,'.J-'

.' .' . '" .,,'. ," .... r , .. :' ·iO .

COMPARISON OF Cm1POSITION AND SOME PHYSICAL PROPERTIES

Sandstone

Eundanocm White Bundanoon Brown Somersby

Gosford

Grains Cloy " Cement

Quartz

60

60

58

54

Others Matrix

2

1

2

3

33

36

37

37

Silica Carbonato

5

3

3 2 5

Specific Gravity

2.5

2.6

Porosity

12 + 2 -

13 + 2

13 + 2 -14 + 2 -

"

Report: WATER ANALYSIS

by

S. Baker

-------------"~ --

ACT H5/1

Following are results for the analysis of samples of Water from the A.C.T. submitted by G.M. Burton.

Conductivity p;B (micro mhos/cm)

Field NO. 11 Unnamed Creek 71 7 .. 4

,

13 Gibraltor Creek 55 7.3 14 Paddy's River 55 7.7 22 Tidbinbilla Creek 70 7.6 23 Woolshed Creek

(Naas ,Road) 180 7.4 25 Tracking Station 38 6. 1 L1 Orroral River 71 7.3 31 11 11 70 7.5

Sample L1 11. p. p. m. m. e./l p. p.m. m. e./l

Cl- 7 0.2 6 0.2 S02-

4 ,(2 <::2 HC0 3

- 45 0.7 45 0.7 0.9 0.9

Ca2+ 12 0.6 12 0.6 IvIg2+ < o. 5 -< o. 5 Na+ 7 0.3 7 0~3

Fe < 0.1 4( 0.1

N0 3 not detected npt detected

0.9 0.9

'i

Report No.1 .....

The Petrogt.'aphy and Geochemistry of three specimens from the. Gordon Downs Aroa~ Western 'Australia.

by

W.R.Morgan~ E.J.Howard~and S.Bakor.

Introduction~ Tho speci~~ns were submitted by D.B.Dow for laboratory examina­tion. Their field numbers~ museum registered nurnbors~ and localities arc listed:-

Field No. Registered No. Locality

D.R .1 D.R.2 D.R.3

R. 15104 Ro 15105 R.15106

Ilrnar's Prospect ]~cIntosh Lapolith So.'.1nders Crock.

The petrography is by W.R.Morgan; a spectrographic examination was carried out by E.J.Howard. S.Baker assayed D.R.1 for copper~ lead, and zinc.

R.15104 : Gossam In hand specimen the rock isfin8-grainod~ fGrruginous~ and in places, stained with green malachite. Numerous irregular cavities that are present range up to a millimetre or so in size; some are filled with qunrtz.

In thin section (10057)~ the spec~en is composed mostly of hydre~od iron oxide, together with some red cuprite in mammillary intergrowth. As noted in the hand specimen, numerous cavities are present. Some are partly filled with granular quart z gTains about 0.5 mD. diameter, and others with green malachite. Fairly small amounts of finG fibro-prismatic crystals of probablo bydrozinf)ite are commonly radially arranged and intergrown with ~rdrated iron oxide. HYdrozincite is enclosed by both quartz and malachite; malachite is enclosed in Quartz. Vory small accounts of a colourless chlorite­liko minoral ar8 present •

The assay results are~- Cu; 19.1%, Ph; 0.34%, Zn; 1.6%.

R.15105z Augite and olivine-bearing hypersthene pyroxenite. On a fresh surface the hand specimen is a dark greenish-gray~ coarse-grained rock. Weathered surf'ac0s are stained by iron oxide and small amounts of green malachite.

In thin section (10058)~ about 85 to 90% of the rock is eeen to be composed of roughly prismatic cryst5.ls of very pale pink, faintly pleo -chroic hypersthene that contains exsolution lamellae of clinopyroxene. The remainder of the rock consists of olivine, augito, some interstitial plagio­clase, and an interstitial brown flaky mineral -possibly bowlingite. A single grain of olive-green hornblende ~~s noted, and accessory black iron oxide~ none altored to henatite, is present. In general texture, tho specimen is inoquigranular and bypidiomorphic; the grain-sizos range from 0.2 mw.to 4 Clln.

Spectrographic analySis, in p.p.m' 9 of this sample is~­Ni, 500, Co, 70, Zn, 200; cu, 5000; v, 10; Pb, minus 10.

R.15106~ Tremolite - epidote granofels~ The hand specimen is a fine~grained epidotic-green rock. Some randomly distributed black crystals larger than the matrix grains aro about a millimetre in aver3ge size, an~ are most noticeab10 on out surface of the specimen. The weathered surfaces are stained

with bydrated iron (':tide.

The thin section (R.10059) was stained with sodium cobaltini­tri to in order to identify potash feldspar. The rock ··has an average groundIi1nsS grain-Size of 0.06 mrn.? tho porphyroblasts range up to 0.7 lJ.[;}. diameter. Tho texture is granoblastic. The groundmass consists mostly of granular~ pale yellow epidote, together with smallor amounts of poikiloblastic (or cavity­filling) calcite and randomly oriented fibro-prismatic crystals of very pa.le green actinoli to. Some interstitial green chlorite is present. Veins a...'1.d irregular cavities in the rock are filled with quartz and probable microcline, the veins are about 0.1 rum. thick. Tho large black crystals noted in the hand specimen are opaQue, and were examinod by W.M.B.Roberts in polished section; he describes them as altered magnetite. He also noted small amounts of pyrite forming grains about 0.3 rnn. di~ater. '

Spectrographic analysis of this specil;len shown in p.p.m., the follovling - Ni, 20; Co? 30; Zn9 n.d.; cu, 100; v, 150; Pb, 10. ',.

(I" '1' ". ,. I

\~

Report No. 84NT/4li,

SPECTROGRAPHIC ANALYSI.S OF SAlVIPLES FRC»'I RUM JUNGLE, N .1..

by

E.J. Howard

Semiquantitative estlluatians were made of the nickel, cobalt, copper, vanadium, tin, molybdenum, berylliwll a":~d lead content of samples from Rtim Jungle, N.T.

The samples were submitted by A.L. Mather as part of the geochemical survey of the area.

The following are the results expressed in ppm.

Area 22

Hole Nos. Depth (ft) Ni Co Cu V Ma Sn Pb Be

4200 BaH ~O 15 1000 300 5 a 5000+ a

4201 BaH 60 60 1500 200 10 a 5000+- a

4202 BaH 500 300 1500 150 a a 5000+ a

4203 BaH 500 500 700 150 a a 500 a

4204 (404N/114E) 10-12 60 40 150 100 7 a 50 a

4205 BaH 700 300 3000 150 5 a 5000+ a

"4206 (53/101f) BaH 100 12 150 200 a a 5000+ a

4206 (7S/1OVl) BaH 100 40 700 300 30 a 5000+ a

4207 BoH 40 5 20 100 5 a 500 a

4207 (3rd BaH 30 5 10 drilling)

70 a a 300 a

4208 BoH 60 40 500 200 a a 5000 a

4209 BaH 40 10 50 150 5 a 1500 a

4209 2j-15 30 5 30 100 " a a 700 a

4212 . 21i-10 150 150 500 150 5 50 1 COO a

4212 BaH 200 150 1500 150 5 10 1000 a

4213 2~27t 300 150 1500 70 5 150 1500 "" a

4213 BoH 700 500 5000+ 70 5 20 2000 7 4214 2~-12* 150 150 100 70 a 50 300 1.5 4214 BoH 150 200 150 50 50 50 300 a

4215 1. 1 7r122 60 40 70 5- 5 200 100 30

421 5_ 12~ 1lit 80 " 80 20 5- a 150 50 30

4215 20-27i 60 40 10 5- , a 200 20 20

4215 27~"-35 80 60 15 5- a 150 30 70

4215 45-58 150 80 50 5 a 300 30 15 4215 BoH 100 150 70 10 a 70 30 30 4215 7t-5l~ 60 80 50 5- a 200 50 15

.~ 4216 1~48i 300 700 700 50 a 70 500 30 4216 27~ .30 200 200 500 5- a 300 300 15

• 4216 BaH 100 100 150 5 7 500 200 150 4217 32i 1000 1500 5000+- 100 5 a 1500 a

Hole No.

4217

4218

4218

4218

4219

4219

4219

4220

4220

4221

4222

Mt. Fitch

5200

5200

5200

5201 .

5201

5201

5202

5202

5202

5203

5203

5204

5204

5203

5205

5205

5205

5206

5206

5206

5207

5207

5207

5208

5208

5209

5209

5210

5210

5210

Depth (ft) Ni

BoH 700

12t

12 37-it BoH

2~ 12t

Special 1 at Holo

BoH " 1

2~-372

BoH

5-15

Surface

1000

1000

1500

300

500

300

200

300

150

700

2.

Co

500

1000

1000

1000

700

1000

700

150

200

40

150

Cu v 5000+ 30

5000+ 30

5000+ 150

5000+ 300

5000+ 200

5000+ 300

5000+ 200

1500 300

5000 200

500 300

1000 10

4-6

8-40

BoH

100 . 300

300 500

5000 50

5000+ 50

5000 10

1500 70 0-4

4-40

BoH

0~2

2-14

BoH

0-2

2-14

4-10

BoH

BoH

2-4

4-36

BoH

0-2

4-40

BoH

0-2

2-16

BoH

0-2

·2-4

0-2

DoH

2-6

6-46

30-46

300

200

500

500

500

30

40

40

80

150

80

40

500

300

.700

200

500

200

40

200

150

40

10

60

300

40

100

150

300

300

100

700

40

20

40

30

100

200

60

40

150 30

200 5

20 100

10 70

5 70

20 70

15 150

500 70

1000 300

15 10

500 1500 100

300 2000 50

500 3000 70

150 1000 50

300 1000 . 30

100 150 20

30 100 50

150 300 200

80 300 150

15 20 70

10 10 50

100 150 70

2000 500 70

80 100 70

60 200 100

100 50 100

Mo

a

10

10

15

5 10

a

a

a

10

50

50

30

20

50

50

30

10

7 10

20

30

30

30

20

15

20

15

15

5 20

15

5 20

15

a

70

5 30

5

Sn

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

Pb Be

300 15

5000+ a

5000+ a

5000+ 10

1500 a

5000 11

1000 a

5000+ a

5000+ a

2000 a

500 a

200 10

200 15

200 20

300 a

300 a

200 a

20 a

20 a

10 a

10 a

30 a

200 a

200 a

50 a

200 a

200 7

200 a

100 a

150 a

30 a

10 a

200 a

50 a

20 a

30 a

10 a

100 a

50 a

50 a

200 a

•

Hole No.

5210

5211

5211

5211

5212

5212

5212

5213

5213

5214

5214

5213

5216

5216

5216

5217

5217

4217 (Area 55) 5217

5218

5218

5218

5219

5219

5219

5220

5220

5221

5221

5222

5222

5223

5223

5224

5224

5225

5225

5226

5226

5227

5221

5228

Depth (ft) Ni Co Cu v

BoH

2-10

10-42

BoH

2-6

6-12

BoH

2-6

6-40 4-6

8-20

BoH

2-4

6-38

BoH

0-2

2-40

12~ 60

BoH

0-4

8-40

BoH

2-6

6-22

BoH

0-2

4-30

2-~

8-40

0-2

2-16

4-8

8-16

0-2

2-'10,

0-2

2-18

0-6

6-14

0-4

6-40

0-4

150 100 150 1 50

80 60 70 20

150 '100 70 10

300 80 70 30

15 ,Co 70 10

1 00 1 50 500 10

30 '40 100 10

40 80 300 15

20 4.D ,-50 5-

5- 5- 5 5-

5- 5- 5 5~

5- 10 5- 5-300 200 3000 5

300 150 3000 ,5-

300

200

150

500

300

80

200

150 700

100 700

100 500

500 5000

60 ' 50

30

150

100

100

50

50

70

50

100

20

50

100 60 10 100

100 150 100 70

80 80 100 50

40 - 40 70 - 20

30 - 15 50 70

30 40 70 50

150 200 300 100

500 1000 1500 100

60 30 200 50

15 10 50 5-

150 60 500 10

150 100 500 30

5 15' 100 30

5- 10 30 5-5- 5 10 5-5- 5 10 5-5- 10

5- 5 300 300

700 150

100 80

15 5-10 5

1500, 5.0

1500 15

30D 150

Mo

5 5 a

5 5 7

;-5 10

a

a

a

a

5 a

a

20

20

a

50

a

5 50

15

a

a

15

5 15

30

5 a

5

7 7 5 5 a

a

7 a

5

Sn Pb

a 30

a 50

a ,10

11 20

a 10

a a

a 20

a 20

a 20

11 a a a

a a

a

a

a

a

a

a

a.

a

10

10

500

10

10

10

a 10

a 10

a a

a a

a 10

a 20

a 30

a 10

a 150

a 150

a 50

a 20

a 20

a 10

a 20

a 20

a

a

a

a

20

20

10

a

20

Be

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

v

Hole No.

5228

5230

5229

5229

5230

5231

5231

5232

5235

5235

5232

5233

5234

5234

5000

5000

5000

5001

5001

- 5001

5002

5002

5002

5003

5003

5003

5004

5004

5004

5005

5005

5005

5006

5006

5006

5007

5007

5007

5008'

5008

5008

5009

5009

5009

Depth (ft) Ni

4-14 10

6-28 300

0-4 500

6-40, 500

2 ... 6 300

2-10 60

0"'2 40

6-10 100

0l...12 300

12-34

0-6

2-4

2-6 ,

8-28

2~Ti

7~12t DoH

0-2i

2~35 BoH

0-2t

2~42

BoH

2~-7t 10-40

BoH 0-2-$j-

'" B'oH

2'~26

0-5

BoH

8-10

0-5

5-10

BoH

0-5

7~28

BoH

2~5

5-12i BoH

2-~5

5-40 DoH

700

80

60

200

700

40

10

15

20

10

10

30

20

40

60

10

5 60

60

" 60

150

100

100

150

60

60

150

80

100

500

700

700

200

300

300

4~

Co

10

700

500

500

150

20

20

60

150

Cu V

50 5-

1000 200

500 200

1000 70

200 300

200 70

300 150

200 30

300 150

500' 300 150

40 200 30

200

300

200

20 100

80 70

300 20

15 10 30

20

30

50

10 20

10 50

15 ·100

15 15 30

10

15

20

20

15

10

10

20

30

40

40

30

40

60

20

20

150

20

30

300

300

300

150

500

100

10

70

20

50

70

15

15'

100

20

100

300

10

50

30

30

30

5-10

70

20

10

70

200 10

500 30

300 300

300 300

150 300

500 200

150 300

200 300

3000 70

3000 20

2000 20

200 20

200 20

10 30

Mo

a

20

10

a

20

5 10

a

'15

20

5 30

30

20

a

a

a

7 a

7

5 5 5 a

a

7 a

a

20

10

10

15

5 10

7 a

5 10

20

15

10

a

a

Sn

a

a

a

a

a

a

a

Pb

10

10

20

a

20

10

10

10

50

Be

a

a

a

a

a

a

a

a

a

a 30 a

a 30 a

a 30 a

a 50 a

a 20 a

a 100" a

a 50 a

a 150 a

a 200 a

a 50 a

a .30

a 200

a 300

a 300

a . 50

a 30

a 30

a 50

a 20

a 30

a 500

a . ,300

a 300

a 100

a 150

a 150

a 50

a 30

a 50

a 30

a 20

a 10

a a

a a

a a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a.

a

v

Hole No~

5010

5010

5010

5011

5011

5011

5012

5012

5012

5013

5013

5013

5214

Brownfs

_ 4000

4000

4000

4000

4000

4000

4001

4002

4003

4004

4005

4005

4005

4005

4005

4005

4005

4005

4006

4007

4008

. 4009

Depth (ft)

0-5

5-40

BoH

(}-5 7k'40

BoH

2~-5

-5-40

BoH

0-7i 7t-40

BoH

BoH

6-8

8-10

10-18

18-28

28-38

6-38

8-10

8-10

10-12

8-10.

8-10

10-12

12-20

20-26

26-36

36-46

8-56

46-56

10-12

8-10

8-10

12-14

, (

5}

Ni Co

40 15

5 10

5 10,

700 15 c)()

700 2006

150 300

500 200

2000 1000

2000 700

60 30

300 100

150 100

5 10

10

10

5 60

80

60

5 60

60

100

200

200

150

60

80

80 80

60

80

80

30

20

30

15

10

40

80

60

10

40

20

150

150

100

100

30

,30

60

60

40

40

30

10

10

bu V

70 20

5 10

5 50.. 2000 20

5000+ 30

2000 50

1500 70

5000+ 150

5000 50

70 200

200 300

50 150

10 5-

50 150

50 150

30 150

50 150

100 150

100 150

50 100

100 100

70 100

100 100

10 100

100 100

100 150

70 150

50 200

50 200

100 '150

100 200

100

100

70

10

100

150

150

100

Mo

a

a

a

15

20

5 5 5

15

30

30

20

a

20

15

15 _

20

30

30

20

10

15

15

10

10

10

15

10

15

15

15

10

20

15

10

Phosphorus was sought but was not detected in any sample. 5- = less than 5, 5000+ = greater than 5,000. a .·not detected, BoH = Bottom of Hole •

• Plate Nos. - 461, 463-469

Lab. serial No. 958

Sn

a

a

a

a

a

a

a

50

10

10

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

Pb

10

20

20

a

50

30

20

10

300

30

300

30

20

50

30

100

200

300

300

300

200

200

200

100

50

50

100

200

200

200

300

100

10

20

30

Be

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

,-.. '.

File No. 120Q 13.

SPECTROCHElVIICAL ANALYSIS OF GEOCHEMICAL SAMPLES FROM INGHAM, QUEENSLAND.

by

E. J. Howard

Semiquantitative estimations were made of the trace metal content of 132 stream sediment samples from Ingham, Queensland.

The samples were submitted by R. Fardon.

The following are the results expressed in parts per million.

.Photo Code SamEle No. Ni Co Cu V Mo Sn Pb

ING/8/5064 318 5- 5 20 20 a 50 70 9/5014 319 5 20 20 10 a 50 70

320 5- 5- . ,5- 5 2 10 50 9/5016 321 5- 5- 5 5- 2 150 10

.. 322 5- 5- 5 5- 5- ·a a 323 5- 5;" '': 5-.. " ,.... '

5~ 10 20 70 '-')24 ' .

5- ': 5~ - 5- 5- 5 a 30 325 5- 5- 5- . 5- a 10 30 326 5- 5- 5- 5 a 10- 30 327 5- 5- 5- 5- 2 20 20 328 5- -5- 5- 5- a a 20

8/5062 330 5- 5- 5 5- 2 10 70 0331 5- 5- 10 5- a 100. 50 332 5- 5- 5 5- a 10- 50

.333 5- 5- :10 5- a .10 30 334

"!- 5- 5- .15 5- .a' 30 100 9/5016 301 5- 5- 5- 5- a 30 5 9/5014 303 5- 5- 5- 5- a 10 10

304, . 5- 5- 5~ 5- a a 20 30.5 5- 5- 5- 5- a 10 30 306 5- 5- 5,.. 5- a 10 1.0 307 5- 5- 5- 5- 2 20 50 308 5- 5- 5- 5- a .10- 5 309 5- 5- 5 5- a a 10 310 10 10 10 5 2 10 30 .

9/5014 . '

311 5- 5- 5 5- a 20 30 312 5- 5- 5. 5- a 1.0 50

9/? 313 5- 10 10 5- . 2 20 70 8/5064 314 5- 5 5- 5 a a 10

'''''&'' '

I ( .'

Photo Code

5/5036

3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5036 3/5158 5/5034 4/5008

5/5034 5/5008

4/5016 3/5160 3/5160 4/5006

3/5160 4/5006 4/5008 4/5014

3/5154 4/5010

-2-

Sample No. Ni Co Cu V Mo Sn Pb

315 316 317 427 428 429 430 430A 431 431A 432 432A 433 433A 434 434A 435 435A 436 436A 437 437A 438 438A 439 440 441 460 461 462 464 465 466 467 468 469 472 471 470 511 512 530 531

5 15 5 5 5- 5 10 5-5- 10 20 50 5- 5- 5- 5 5- 5 5- 5-5- 5 5- 5 5- 10 5- 5-5- 5-5- 10 5- 5-5- 10 5- 5 5- 10 5- 5 5- 5-

5- 10 5- 5 5 5-

10 5 5- 5-

10 5 5 30

10 10 5 30 5- 5-

5- 5- 10 5-5- 5- 5- 5-5- 5- 5 5-5- 5 5- 10 5- 10 5- 5-5- 5-5- 5-5-' 5-5- 5-5- 5-

5- 5-5 5-5 5-5 30 5- 5-5 5 5- 5 5-5-5- 5-

5- 5- 5 5

a

a 2

a a

a

5

a a a

a

a a

2

a

a a

a

a

2

a a a

a a

a

a a

5- 5- 5 . 5- 5- 5-

5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5-5- 10- 5-5- 10- 5 5- 5- 5-5- 5- 5-

5- a

5- 2

5- a 5- a 5- a

5- a 5- a 5- a 5- a 5- a 5 a 5 a 5- a 5- a

10 50 10 50 ,a 30 a 20 a 20 a 30

10 20 a 20 a 10 a 10

10- 10 a 10 a 30 a 20 a 20

10 20 10- 50 a 20 a 10 a 20 a 30 a 10 a 10 a 20 a 70 a 20 a 20 a 30 a 20 a

10 a

a a

a

a

a

a a

a a

a

50

a

50 20 a

20 30 20 20

a 20 30 20 20 10

Photo Code

4/5012

2/5140

1/5122 2/5138

4/5012

3/5154

4/5014

5/5026 1/5122

2/5138 1/5124

2/51 LlI"O

1/5124

1/5128

1/5126

-3-

Sample No. Ni Co Cu' V Mo Sn Pb

532 5- 5- 5 5 a a 20. 533 5- 5- 5- 5- a 10 50 534 535 536 537 538 539 539A 540 540A 541 542 543 544 545 546 547 548 549 550 551 556 557 558 559 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577

5- 5- 10 5 5- 5- 5 10 5- 5- 5 50 5 5- 5 10

a 10 50 a a 10 a 10,... 20 a 10 20

5- 10 5 5 & a 10 5- 10 5- 5-5- 5-5 5-5- 10 5- 5-5- 5-

5- 5 a

5- 5- a

5- 5- a 5- 5- a 5- 50 a 5- 5- a 5- 5- a

a 20 30 50

9. 50 10- 50 a 30 a 50 a 50

5- 5- 5 5- a 10 10 5- 5- 55- 15 20 70 5- 5- 5- 5- a a 10 5- 5- 15 5-5- 5- 5 5-5- 5 20 5-5- 10 5 30 5- 10 5 20 5- 5- 5- 5-5- 5- 5- 5-5- 5- 5- 5-5- 5- 10 10 5- 5- 5- 50 5- 5- 5- 5 5- 5- 5- 5-5- 5- 5- 5-5- 5- 5- 5

a

5 a a

a

5 a

a

10 a

a a

a a

5- 5- 5 5- 5- 5-5- 5- 5-5- 5- 5-5- 5- 5

5 2

5- 10 5- 10 5- 5 5- 5 5- 5 5- 5-

5 2

5- 2

5- 2

5- a 15 10 10 .10 5 5-5- 5-5 5-5- 5-

7 2

a

a

a

a

5- 5- 5 5-' 3

a 20 30 50 50 50

a 30 a 30

10 50 a 50 a 30 a 70

10- 50 10- 50 10- 50 10 70 n 50 a 50

10- 50 10- 50 a 70 a 50 a 70 a ' 50

10- 70 10- 50 a 70 a 50 a 70

. \

-.~~-" •.. ' ,,, .-

." ....

r~'~

.~ .. - . ; ,. . "

,.' ...... r

,- -4-

.... Photo Code Sample No. Ni . 00 Cu V Mo Sn Pb

578 5- 5- 5- 5- 7 8. 70 2/5134 579 5- 5- 5- 5- a a 70

580 5- 5- 5 5- 2 a 50 6/5012 580A 5- 5- 5- 5- a 10 50 2/5136 581 5- 10 5 10 a a 10 7/5040 581A 5- 10 5 10 El a 20 2/5136 582 5- 5 5 10 10 a 20 7/5040 582A 5- 10 5 10 a a 70

583A 5- 10 5- 10 a a 10 L'r/5008 584 5- 10 5 10 a 8. 50

585 5- 10 5 5- a a 50 6/5014 5862. 5- 10 15 10 D- a 50

586b 5- 10 10 10 a a 50 586c 5- 5 5 5 a a 10 58711 5- 10 10 10 a a 30 587b -5- 15 10 10 a a 50

2/5136 583 5- 10 10 5 10 a 20

Beryllium and phosphorus were also sought but were not detected in any s8mple.

"f.1" - not detected 115- 11

- less than 5 p.p.m.

Lab serial No. 1004 Spectrograph plate Nos. 490-496.

"f· .. ,,' \~

0'

" File No. 198Q/5

SPECTROGRAPHIC ANALYSIS OF STREAM SEDD,:!ENTS FROM MT. GABN:&'"'T 2 QUEENS1A.L~

by

E.J. Howard

Semiquantitative estimations were made of the trace metal content of stream sediment samples from Gurrumba and Return Creek areas, Mt. Garnet, Queensland. The samples were submitted by K. Yates.

The following are the results expressed in parts per million.

Sample No. Ni Co Cu V Mo Sn Pb

MG5/25/1 5- 5 5 5- 5 a 50

MG5/27/2 5- 10 10 5- 5 10 20

3 5- 5 10, 5 5 15 20

4 5- 5 5 5- 5 a 30

5 5- 5 5 5- 5 10 20

6 5- 10 5 5- 5 a 20

7 5- 5 5 5- 5 10 20

8 5- 10 5 5- 5 10 30

9 5- 10 10 30 5 15 30

10 5- 10 10 20 a 30 20

MG4/119/11 5- 10 10 20 5 a 20

12 5- 5 5 20 5 a 20

13 5- 10 20 10 5 200 30

14 5- 10 5 30 a a 20

MG5/27/15 5- 10 10 50 5 50 30

16 5- 10 15 20 5 200 30

MG5/25/17 5- 5 5 5"- 5 a 30

18 5 10 10 20 5 300 20

19 5- 5 5 5- 5 10 20

20 5 10 15 30 5 200 20

21 5 5 5 5- 5 10 20

22 5 10 5 5 a 70 pao MG2/11/23 5- , 5- 15 5- a 50 200

24 5- 5 20 5- a 100 300

MG2/9/25 5- 5 15 5- a 70 300

26 "5- 5 10 5 a 20 70

27 5- 5 5 5 a ,20 20

"28 5- 10 5 5 5 20 50

29 5- 5- 20 5- 5 70 200

30 5- 5 10 -5 a 70 200

31 5- 5- 10 5- 5 70 200

32 5- 5- 10 5- a 200 200

33 5- 5- 15 5- a 500 300

'.

cf' ~ ~ \tl

I: 0'

, File No. 198Q/5

SPECTROGRAPHIC ANALYSIS OF STREAM SEDIMENTS FROM MT. GABNb"T 2 Q.UmmLfu""ID

by

E.J. Howard

Semiquantitative estimations were made of the trace metal content of stream sediment samples from Gurrumba and Return Creek areas, Mt. Garnet, Queensland. The samples were submitted by K. Yates.

The following are the results expressed in parts per million.

Sample No. Ni Co Cu V Mo Sn Pb

MG5/25/1 5- 5 5 5- 5 a 50 MG5/27/2 ' 5- 10 10 5- 5 10 20

3 5- 5 10 5 5 15 20

4 5- 5 5 5- 5 a 30

5 5- 5 5 5- 5 10 20

6 5- 10 5 5- 5 a 20

7 5- 5 5 5- 5 10 20

8 5- 10 5 5- 5 10 30

9 5- 10 10 30 5 15 30

10 5- 10 10 20 a 30 20

MG4/119/11 5- 10 10 20 5 a 20

12 5- 5 5 20 5 a 20

13 5- 10 20 10 5 200 30

14 5- 10 5 30 a a 20

MG5/27/15 5- 10 10 50 5 50 30

16 5- 10 15 20 5 200 30

MG5/25/17 5- 5 5 5.,. 5 a 30

18 5 10 10 20 5 300 20

19 5- 5 5 5- 5 10 20

20 5 10 15 30 5 200 20

21 5 5 5 5- 5 10 20

22 5 10 5 5 a 70 0~0

MG2/11/23 5- , 5- 15 5- a 50 200

24 5- 5 20 5- a 100 300

MG2/9/25 5- 5 15 5- a 70 300

26 5- 5 10 5 a 20 70

27 5- 5 5 5 a ,20 20

28 5- 10 5 5 5 20 50

29 5- 5- 20 5- 5 70 200

30 5- 5 10 -5 a 70 200

31 5- 5- 10 5- 5 70 200

32 5- 5- 10 5- a 200 200

33 5- 5- 15 5- a 500 300

2.

Sample No. Ni Co Cu V Mo Sn Pb

MG1/31/35 5- 5- 10 5- 5 150 100

36 5- 5- 10 5- a 1500 200

MG2/9/37 5- 5 15 5- 5 150 300

MG2/11/38 5- 5 20 5 a 50 300

39 5- 5 20 5 a 50 200

40 5- 5 10 5 a 70 70

41 5- 10 10 5 a 70 ~o

42 5- 5- 15 5- 5 200 100

43 5- 5- 15 5- 5 1000 100

44 5- 5- 10 5- a 300 100

MG3/101/45 5- 10 to 20 a 20 200

46 5- 10 10 20 a a 300

47 5- 10 5 20 a a a

48 5- 10 20 50 a a 200

49 5- 10 10 70 a a 1(':

50 5- 10 10 100 5 a 20

51 5- 10 10 50 a 50 10

MG2/11/52 5- 10 10 20 5 a 20

MG3/103/53 5- 5- 15 5- 10 500 100

54 5- 5- 15 5- 5 700 100

55 5- 5- 15 5;" 5 100 . 100

56 5- 5 15 5 5 700 100

MG3/101/57 5- 5 20 5- 5 300 100

58 5- 5- 20 5- 7 1500 100

59 5- 10 20 30 5 70 300

MG4/113/60 5- 5- 15 5- 5 300 100

MG3/101/61 5- 5- 15 5- a 500 100

MG3/101/62 5- 5- 30 5- a 500 70

63 5- 5- 15 5- 5 1000 150

64 5- 5 20 5- a 200 150

65 5- 5 20 5- 5 200 100

Beryllium and Phosphorus were not detected in any sample.

'5-' - less than 5 p.p.m. , at - Not detected (Mo - 5 ppm., Sn - 10 ppm., Pb - 10 ppm.)

Lab serial No. - 1081

Plate Nos. - 519, 520, ~21.

~,..., .. , -, t

"r- t-. .:'4).:

REPORT NO. 84NT/1

SPECTROGRAPHIC ANALYSIS OF GEOCHEMICAL SAXPLES FROM RUM JUNGLE

by

E.J. Howard

Semiquantitative estimations were made of the trace metal content of geochemical samples from Rum Jungle.

The samples were submitted by P. Pritchard.

The following results are expressed in parts per million.

WIt Fitch Sample No. Depth Ni Co Cu V Mo Pb Remarks

{ ft}

7235 14-16 7 7 15 20 '8. 15 7236 14-16 5- 5- 15 30 ' a 5 7237 14-16 5 5- 10 50 . a 10 7238 14-16 5 5- 10 10 a 10 7239 14-16 5- 5- 15 100 .' 7 20 7240 10-16 7 7 20 100 7 15 7241 10-16 5 5- 20 20 a 50 7242 '0-16 5 10 20 50 7 150 7243 10-16 5- 5 15 100 7 100 7244 14-16 5 5- 15 30 . 5 200 7245 14-16 200 200 100 30 ' a 20 Be(10) 7246 12-16 5 5 15 30 : 10 50 7247 14-16 20 20 25 . 100 10 200 7248 12-16 5- 5 20 70 5 50 7249 14-16 No Result 7250 14-16 10 7 20 70 5 30 7251 14-16 No Result-7252 14-16 No Result

7253 14-16 5 5- .15 30 a 15 7254 8-16 7 5 10 50 . a 15 7255 8-16 5- 5- 5 20 a 5 7256 10-16 5- 5- 5- 20 a a 7257 12-16 No Result

7258 4-16 7 5 10 50 . 5 10 7259 ,t-16 5 5 10 100 7 10

'7260 2-16 5 5 7 100 5 a 7261 4 - 8 10 10 5- 10 a a 7262 14-16 20 5- 5- 20 a a 7263 10-16 5~ 5- 5 50 . a 10 7264 8-16 10 ~ 10 30 5 a

..

7265 8-16 ... ~ '.

No Result 7266 10-16 7 5- 10 20 . a 10

,.;oJ'~'1

~{

2.

Sample No. ' Depth Ni Co Cu V Mo Pb Remarks (ft)

7267 12-16 5 5- 10 50 a 10 7268 10-16 No Result 7269 14-16 No Result 7270 10-16 No Result '7271 14-16 No Result 7272 12-16 5 7 20 50 a 20 7273 2-16 30 25 25 100 5 50 7274 14-16 30 30 30 100 7 70 7275 6-16 30 30 70 100 5 70 7276 12-16 60 40 50 150 7 70 7277 6-16 30 60 20 70 7 50 72~9 6-12 30 70 50 20. 10 300 7279 4-12 No Result 7284 8-16 15 5 20 70 10 10 7285 10-16 10 5 7 20 a 10 7283 10-16 No Result 7280 6-16 5 80 25 50 5 15

·7281 4-16 60 150 25 70 20 50 Be10 7282 8-16 7 15 15 100 a 20 7286 12-16 No Result 7287 12-16 10 15 10 50 a 20 7288 14-16 80 80 20 30 a 10 7289 12-16 5- 12 20 150 10 15 7290 8-16 5- 5 5 70 a 15 7291 14-16 5 20 20 5 a 10 7292 14-16 5- 5 10 100 5 10 7293 14-16 5- 5- 5- 50' a 5 7294 10-16 5- 5- 5 150 5 a 7295 10-16 500 30 5- 10 a a Be(30) 7296 4-12 5- 5- 5- 20 a a 7297 2 - 6 5- 5- , 5- 50 a a 7298 4-16 No Result 7299 2-16 5 5- 10 50 5 10 7300 8-16 7 5- 5- 10 1 a 10 7301 10-16 5- 5 5 50 a 15 7302 12-16 5- 5- 5 20 a 10 7303 12-16 10 5- 7 20 a 20 7304 14-16 No Result 7305 14-16 5- 5- 5 30 a 15 7306 10-16 10 5- 5 50 a. 15' 7307 8-16 No Result 7308 12-16 5- 5- 15 100 a 15 7309 12-16 5- 5- 20 100 a 20

......... !\

/ ~.

3.

Sample No. Depth Ni Co Cu V Mo Pb Remarks ~ftl

7310 8-16 5 12 15 70 10 30 7311 14-16 10 100 30 100 10 100 7312 14-16 60 60 25 50 5 50 7313 14-16 ·7 7 50 100 a 20 7314 10-16 5- 5- 15 100 a 20 7315 6-8 5- 5- 15 70 a 20 7316 8-16 30 10 50 200 a 500 7317 8-16 5 7 20 30 a 50 7318 12-16 10 7 20 60 a 100 7319 12-16 5- 7 25 100 10 50 7320 10-16 7 5 20 50 5 20 7321 4-16 5- 5- 10 30 a 10 7322 14-16 5- 5- 5- 20 a a 7323 10-16 5- 5- 7 30 a 10 7324 14-16 . 5- - 5- 5- 20 a 10

7325 14-16 No Result 7326 12-16 10 15 10 20 a 10 7327 12-16 30 15 10 30 a 10 7328 14-16 5 5 10 50 5 a 7329 8- 6 7 5- .r:- 50 5 a " 7330 6-16 5- 5- 5 50 a a

7331 10-12 5- 5- 5- 10 a a 7332 10-16 30 5- 5 20 a a

7333 5 5- 5- 30 a a

7334 8-16 7 5- 5- 30 a 10 7335 8-16 5- 5- 5- 5 a 10 7336 12-16 5- 5 7 50 7 10 7337 14-16 5- 5 5 30 a. 10 7338 4-16 No Result 7339 14-16 7 7 15 50 5 20 7340 8-16 No Result 7341 12-16 No Result-7342 14-16 5- 5- 15 50 a 10 7343 10-16 5- 5- 20 50 a 10 7344 14-16 5 5- 20 100 5 20 7345 12-16 10 5- 25 50 7 20 7346 10-12 5 5 20 150 a 200 7247 8-16 15 10 20 70 a 50 7348 12-16 25 15 20 100 10 200 7349 1€}-16 10 12 50 20 10 70 7350 10-16 5...; 5- 15 50 a 20 7351 12-16 5 5- 20 50 a 20

'I

Sample No. Depth ~ft~

7352 4-16 7353 14~16

7354 14-16 7355 14-16 7356 12-16

·7357 6-16 7358 14-16 7359 8-16 7360 10-16 7361 14-16 7362 2- 6 7363 10-16 7364 10-16 7365 10-16 7366 8-16 7367 12-16 7368 . 4-16 7369 4-16 7370 4-16 7371 6-16

Plate Nos. 657-659 661-664.

Ni

7 5-5-

5 5-

30 7 5 5-5-7 7

10 10

5 s

10 5-5-

4.

Co Cu V Mo Pb Remarks

5- 20 100 - 5 20 5- 20 100 a '10

5- 15 100 5 10 No Result No Result

5 15 30 a 10 5 15 30 a a

60 25 30 7 10 5- 10 50 7 a

5- 5- 20 a a

5- 25 50 a 20 5- 5 20 a a

7 20 30 5 a

5- 15 30 a 20 20 20 100 10 70 10 . 25 200 7 20

5 25 100 7 30 10 25 150 10 20 5- 25 2vO 5 500 5 25 200 a 10

- 2 -

Ni Co Cu V Mo Sn Pb Be Hole Nos. Depth ____ ---"(..::f..:;.e~et.:....!_) __ -______ "" ________________ _

- 4020

4020 4020 4021 4022 4023 4024 4025 4025 4025 4025 4025 4025 4025 4026 4"027 4·028 4029 4030 4030 4030 4030 4030 4030 !~030

4030 4031( 1)

4031(2 ) 4032(1) 4032(2) 4033(1) 4033(2) 4034(1) 4034(2)

4035 4035 ~r035

4035 4035 4035 4035 4036

36-46 46-52 52-60 12-14 14-16 -14-16 10-12 6-8 8-12 12-? 20-30 42 42-54 54-64 6-8 4-6 6-8 8-10 8-10 10-12 12-14 14-24 24-32 32-42 42-52 10-52 8-10 8-10 6-8 6-8 4-6 4-6 6-8 6-8 6-8 8-10 10-20 20-30 30-40 40-52 6-52 8-10

20 20 1500 150 30 a 40 60 5000+ 200 30 a

100 100 5000+ 200 50 a 40 Bo 1500 200 20 a 30 20 5000+ 200 5 a 60 40 5000+ 300 20 a 10 40 5000+ 300 20 a 20 60 1500 500 50 a 80 150 5000 300 ·50 a

300 150 5000+ 300 30 a 300 150 5000+ 300 50 a

500 200 5000+ 500 50 a 300 150 5000+ 300 70 a

300 150 5000+ 200 70 a 60 60 1500 500 30 a 30 40 40

40 1500 300 15 pO 1000 300 15 80 1500 150 15

a

a a

40 30 1000 200 15 a

30' 40 1000 200 15 a 40 . 30 1500 200 20 a 40 30 5000 300 30 a 60 40 5000+ 300. 50 a 40 40 5000+ 300 70 a

60 40 5000+ 300 70 a 40 30 5000+ 200 50 a 30 60 1000 500 30 a 30 60 1500 500 20 a

80 40 1500 300 20 a 60 40 1500 300 30 a

100 60 1000 200 20 a 200 150 1500 200 50 a 100 80 1000 300 30 a 70 60 1000 500 50 a

150 150 1500 300 70 a

100 100 1000 200 70 80 80 700 200 70 80 60 500 200 30

200 100 1000 200 30 200 150 1500 150 20 200 150 1000 200 30

40 20 500 200 20

a

a

a a

a a

a

30 30 30

100

.50 30 30 50

150 50 50 50 50 70 50 50 30 30 30 20

30 2Q 20

30 20 20

10

30 10 20 10 10 20

30 30 20 20 20

30 20 20 20

a a a

a a

a

a a a

a

a

a a

a

a a

a a

a a

a a a

a

a a a

a

a a a

a

a

a

a

a a

a a

a

a a

Hole Nos. Depth (feet)

40,37 40,38

40,39

40,39 40,40, 40,40, 40,40,

40,41 40,41

40,41

40,41

40,41

40,41 40,41

40,41 40,41 40,42

40,43 40,44 40,45 40,45 40,45

4045 40,45 40,46 40,46 40,46

·40,50,

40,50,

.40,50,

40,51 40,52

40,53 40,54 40,56

40,57 40,58

40,59 40,60, 40,60, 40,60, 40,60,

'40,60,

8-10, 8-10,

6-8 8-16·

10,-14

14-18 18-20,

4-6 q-8 16-26

26-36

, 36-46

46-56

56-62 68-74 4-74 8-10,

6-8

4-6 4-6 6-8 8-12·

12-16

4-16 6-8 8-12 12-14 10,-20,

20,-26

10,-26

6-8 6-8 8-10, 8-10,

6-8 6-8 8-10,

6-8 8-10, 10,-12

12-22 22-30,

30,-38

- 3 -

Ni Co Cu V Mo S:n Pb

60, 60, 150,0, 30,0, 70, 60, 40, 30,0,0, 30,0, 50,

40, 40, 10,0,0, 300 15

a 50

a 50 a 20

200 80 3000 300,. 10

150 80 2000 500 30 200, 10,0 5000+ 30,0 30

a 30

a 50

a 50 300 150, 5000 20,0 15 a 50 300 80 300,0 500, 15 a 20

200 10,0 3000 500 15 a 30, 20,0, 60 5000, 500 10, a 20

300 80 50,00. 500 15 a 70

500 200 5000 200 5 a 70

500 300 5000+ 300 7 a 100 300 30,0 50,00+ 200, 5 a 50 300, 30,0, 50,00,+ 200, 7 a 50 300, 20,0, 50,0,0, 20,0,

150, 60, 50,0,0, 300,

150, 80 3000 300

150 150 3000 300, 500 150 5000, 300 30,0 100 3000 20,0

500 150 5000, 150, 50,0, 200 5000 150 30,0, 200 50,0,0 150,

200 100 200,0, 150 300 100 200,0, 150

300 150 50,00 100 300 150, 300,0, 300 300 200 5000, 300

300 200 5000 300,

300 500 5000 300 300 300 200,0 200,

700 150. 500,0+ 200 300 700 500,0 200 500 500, 500,0 20,0 300 30,0 500,0,+ 300, 200 30,0, 300,0+ 10,0

300 70,0, 3000+ 100 30,0 100,0 5000+ 150, 200 100,0 5000,+ 100 300 150,0 5000+ 10,0

'300, 70,0·5000+.100 300 700, 500,0,+ 10,0

7 a

15 a

15 a 20 a

30 a 15 a 10 a 10 a

15 a

15 a

10, a

5 a 10 ,a

15 a 15 a 15 a 10 a

15 a 10 a 5 a

10 a 5 a 5 a 5 a 5 a 5 a 5 a 5 a

50, 30,

30 50

10,0

50 30 30,

50 30

10,0

20

100 100 10,0

100,

50, 50,

100, 70,

50 50 50 70

50 50 50 70

Be

a

a

a

a

a

a

a

a

a

a

a

a

a a

a a

a

a a

a

a

a a

a

a a

a

a

a a

a

a

a

a

a a a

a

a a

a a a

4 -

Hole Nos. Depth Ni Co eu V Mo Sn Pb Be .

____ -'( ..... f_e_e_t ..... ) _____ . __ . _________________ _

4060

4062

4063

4064

4064

4070

4078

4070

4070

4070

4065

4065

4065

4066

4067 4068

4069

4071

4072

4072

4073

4074

4076

4077

4079

4080

4080

4080

4081

4055

AREA 55

4213

4213·

4213

4221

4223

4223

4224(1)

4224(2)

4224

4225

8-38

6-8

8-10

4-8

8-10

4-10

8-10

10-12

12-16

4-16

8-10

10-14

8-14

4-8

4-6

4-6

8-10

4-6

6-8

8~10

4-6

4-:-8

4-6

12-14

8-10

8-10

10-18 . 18

6-8

8-42

2213-2713 BaH 12i-20.

BaH 2~-17i BaH BaH BaH 2i-20 2~'-20

500 1000 5000+ 150

100 700 5000 100

150 700 5000' 150

100 200 1500 100

150 1000 5000+ 150

150 200 1000 70

150 100 . 500 30

150 300 1500 50

150 300 2000. 70

150 300 1500 70

200 2000+ 5000+ 200

200 2000 5000+ 200,

200 2000 5000+ 200

300 2000+ 5000+ 200

60 500 1500 150

150 700 2000 150

-500· 700 5000+ 150

300 700 5000+ 150

300 300 3000' 100

300 700

100 200

150 200

80 100-

200 100

60 30

. 100 20

200 80

200 100

200 100

300 700

5000+

2000

5000

700

1500

200

300

500

200

100

150

70

50

50

30

50

700 50

500 70

5000+ 200

500 200 2000 20

300 80 1500 70

300 150 1500. 100-

150, 80 700 500 150 60, 700 300

100 30 500 300

100 60 1000 200

100 40 1000 200

80 40 1000 200

150 150 1000 200

5 5

'5

5 7

10

5 5 7 7 7

7 7

10

10

7 7

10

10

15

10

10

5 -5

5 a

5 5 5 5

a

a

a

a

.a

a

a,

a

a

a

a

a

a a

a

a

a

a

a

a

a

a·

a a

a

a

a

a

a a

50

50

100

50

100 70'

30

50

50

50

50

50

70

50

50

30

30

30 20

50

30

70

30

30

30

20

20

10

10

150

a

a

a a a

a

a a

a

a

a

a

a

a

a a a

a

a

10

a

a

.a

a a

a

a

a

a a

a 20 500 a

2 50 700 a 5 50 1000 a a 10 5000 a a 10 2000 a a 10 2000 a

a a 5000+ a

a a 5000+ a

a a 5000+ a

a a 5000+ a

Hole Nos.

4225

4226

4226

4227

4227 4228

4228

4228

4229

4229 4200

4201

4201

4202

4202 4203 .

4203 4204

4205

4206 4206

4207 4208

BROVlN'S

4055

4055

4055 4055 4088

MT, FITCH

5215

5236

5237 5238

5239 5240

5241

5242 5243

Depth ~(feet )

BoH 5-20

BoH 2~-15

BoH 5-20 BoH BoR BoH

7~-15

2-4

2-4

4-64 0-2

4-27 2-4

4-42 - 6-34

2~'-1071J

0-2i

2t-45 21\-15

2-~-55

8-10

20-30 10-20

30-40

14-24·

6-10 6-12

6-10

4-12

6-14

6-17 2-10

6-10

8-12

Ni

150

150 100 200

200

80

- 5 -

Co

150

150 100

)

150 100

60

60 60

80 100

100150

80 150

40 20

40 15 60 40

100 100

300 200

Cu V Mo

700 150 a .

500 200 a 150 150 a 150 150 a 150 100 a

50 5- a 20 5- 2 50 5- 2

300 5- a 300 . 10 2

300 300 10

300 300 5

500 200 7

200 150 10

700 70 a

80 60 200 200 5 200 200 500 150 a

60 40 300 300 20

300 200 1500 150 5

60 15 200 300 10 100 15 300 300 a

40 5- 50 150 5 100 15 300 200 a

300 500 2000 200 5

500 1000 5000+ 200 7

300 500 5000 300 10 500 1000 5000+ 200 10

40 60 5000+ 200 70

10 10 30 60 100 1000

300 40 70

700 300 1500 300 200 2000

100 20 200

300 200 1000

700 200 2000

500 700 2000

5- 5 50 5 20 a

30 15 50 a 20 a

10 5 70 a

20 5

Sn Pb

a 5000

a 2000

a 700

a 500 a 700

300 30

Be

a

a a

a

a

50 500 30 70 300 100 20

100 100 15

200 500 15

a 5000+ a a 5000+ a

a 5000+ a a 1500 a a 1000 a

a 5000 a

a 1500 a a 5000+ a

a 5000+ a

a 5000 a

a 5000+ a

a 500 a.

a 5000+ a

a

a

a a

a

a a

a a

8.

a

a a a

100 a 100 a 100 a

100 a 300 a

20

10 10

10 200

30

30 10

10

a

a a

a

a

a

a

a a

Phosphorus was not detected in any sample. Spec. Plate Nos. 470-477

SPECTROGRAPHIC AN.L'.LYSIS OF DD\.MOND DRILL CORE Sll1iIPI.ES FROM TENN1~T CREEK, N.T.

by

E.J. Howard.

Thirty-seven samples from two drill holes were submitted by P.G. DUWl for spectrographic analysis. The holes are designC1ted Porphyry Drill Hole and No. 5 Cat's Whiskers Tennant.Creek} N.T.

The following results are expressed in parts per million.

Porphyry Drill Holo

Depth (ft.) Ni Co Cu V Mo Pb

183 5- 10 15 20 5 10

190 5- 10 150 10 2 10

200 5- 10 15 15 2 10

210 30 20 50 20 a 5 220 5- 10 10 10 '2 10

230 5- 20 100 5~ 5 a

240 5- 40 10 5- 5 a

250 5- 15 5 5 5 a

260 5- 20 10 10 5 20

210 5- 10 20 5 a 10

280 5- 10 5 5 5 a

290 5- 10 50 5 15 a

300 5- 10 10 5 5 a

No. 5 Cat's lfuiskers

196 5- 5- 5- 10 a a

206 5- 5- 5- 30 a a

216 5- 5- ~ 20 a a

226 5- 5- 5'~ 10 a a

236 5- 5- 5- 20 a a

246 5- 5- 5- 20 a a

256 5- 5- 5- 20 a. a

266 5- 5- 10 20 a a

216 5- 5- 10 10 a a

286 5 10 5 30 a a

296 5- 5 5 20 a a

No Depth given 5 5 20 20 a a

316 5 20 50 5- 2 a

326 10 20 200 20 a a

336 '10 .15 10 20 a a

346 5 10 10 20 a a

356 20 20 500 10 2 a

366 10 20 200 10 2 a

2.

Depth (ft. ) Ni Co Cu V Mo Pb

376 10 20 70 10 a a

386 5 15 200 30 a a

396 10 150 500 5<;- 2 a

425 5- 80 200 5- a

435 5- 60 50 5- 5 a

448 5, 30 200 10 a a

"5-" less than 5 ppm.

"a" not detected (Pb - 10 ppm, Mo 2 ppm)

Lab. serial No. 1032

Tho results from Catrs Whiskers No.5 are of special interast as the hole intersected a quartz-magnetite lode containing about 2% copper at depths between 396 1 and 425 1 •

It will be noted that the cobalt-nickel ratio is greater than illlity near the lode wherens in genoral it is of the order 0.8. This may be 'worth further consideration.

l~omalous copper values extend through the black metamorphosed beds but only a few feet into the overlying mudstone - boundary between 316'~26. Black crystals are visible in the mudstone near the rock boundary and these may be responsible for tho slightly anomalous copper values.

It may be of interest to exrunine the black metamorphosed bods some distance from the lode to compare copper values in the rock unaffected by the lode.

·.,. __ .. ..-_ .... -,_ ......... . Report No. File No. 84NT/1

SRectrogra;ehio Analysis of Geochemical Samples from Rum J'ungle N. T.

by

E. J. Howard

Semiquantitative estimations were made of tnetrace metal content of geoch.eulioal samples from Rum JWlgle, N. T. The sample s were submitted by

. P. Pritchard.

The following results are expressed in parts per million.

Area. ~~

Sample No~ Depth (ft) Ni Co Cu V Mo Pb Remarks

348N/622E 8-22 80 25 25 100 a 100 II 624E 10-20 30 20 20 150 a. 20

352N/593E 10-32 80 30 20 50 a 100

" 594E 15"'38 60 60 50 50 a 200

" 595E 10-35 30 25 50 50 a. 50

" 596E 10-25 30 20 50 30 a 30

" 596E BoH 30 20 25 50 a 7' 11 597E 10-30 25 20 25 50 a. 100

" 618E 12-28 60 20 50 150 a 10

" 600E 12-42 30 25 50 30 a 500

" 602E 10-43 30 15 50 100 a. 700

" ~4E 6-32 60 15 25 150 a 100

" 612E 12-43 40 12 25 200 a 100 11 614E 12-36 40 15 40 150 a. 50

" 616E 12-25 40 25 15 150 a. 500 Be (15) 354N/597E 12-30 30 30 40 100 a. 20

599E 10-35 30 20 40 150 a 20

601E 12-)0 30 20 40 150 5 200 60JE 6-38 60 40 70 200 1 150

~6N/594E 20 30 10 10 5 10

596E 10-23 20 20 40 150 a 20

598E 12-35 30 20 40 50 a. 200 600E 10-40 60 30 25 50 a 1500 602E 10-35 30 30 50 150 5 700 604E 10-38 40 30 100 200 5 200 606£ 10-)8 30 15 50 300 a 50 608E 12-31 20 12 50 200 5 150 610E 10-35 10 5 100 300 10 500 61,2E 8-33 40 12 100 150 a 50 614E 12-30 60 12 100 200 a 20

Sample No. Depth Cft)

356N/616E

618E

620E

622E

624E

360N/594E

596E

598E 600E

602E'

604E

606E

608E

612E

614E

6168

618E

620E

10-35

15-25

15-28

16-24

15-28

10-20

10-35

10-38

6-30

12-43

10-30

12-36

12-36

10-24

12-42

9-24 12-36

9-27 622E 10-30

624E 9-40

360.75N/61OE 12-42

340N/608E 9-42

610E 610E

614E

616E

6~8E

620E

622E

624E

592E 342N/593E

594E

595E

596E

597E 598E

599E

344N/592E

593E 594E

595E 596E

2-42

12-40

6-42

6-42

12-36

10-11

9-27 9-18

6-40

6-39 12-38

6-29 12-25

10-35

9-27 12-24

12-40

12-46

15-40

10-35 12-36

:Hi

40

30

30

40 80

80

40

12 .

80

20

20 25 '

100

20

80

60

60

60

30

30

60

25

30 40

150 20

30

100

30

15

5 5 5 5

40

.30 40

20

.30 .40

30

30

30

Co

12

20

15

20

20

60

30

10

20

20

10

20

20

10

20

30

30

20

15 20

20

20

2.

Cu

100

20

50 40

40

25

40

40

50

50

50

70

50

70

15 20

25

25

50

50 100

25

15 25 20 25

30 70

10 25

20 15

30 20

10 25

10 25

5 5 5 10

5- 15

5- 100

30 25

30 20

30 70

20 15

15 40

20 20

20 40

30 200

20 40

v Mo

300 a'

200 a

200 7 150 a

200 a

50 a

150 a

200 5 300 5 300 a

150 a

200 a

300 5

200 5 200 a

300 a

100 a

700 a

200 a

300 a

200 a

300 a

200 a.

500 a

100 a

300 a

200 a

.300 a

200 a

200 a

50 a

50 a

200 a

100 a

100 a.

70 a

30 a

20 a

100 a

50 a

50 a

100 a

100 a

Pb

100

10

20

500

50 20

20

150

50

300

100

200

150 500

10 200

50 20

20

50 100

100

150

20

500

1000

100

150

50 20

100

100

200

1000

50 10

1500

50

500 200

100

1500

300

Remarks

.. . \

3.

Samplo No. Depth Ni . ~o Cu V' Mo Pb Remarks

344N/597E 12-31 40 ( OJ 50 100 5 150

598E 12-34 40 J.l 40 100 a 1500

599E 12-30 40 3C 25 150 a 50

Mt. Fitoh

7372 0-6 No Result

7373 6-11 Ho Result

7374 6-30 1000 150 100 100 a a

7375 6-20 500 150 2000 100 a a Be 10

7376 12-30 200 200 50 20 a a Be 20

7377 6-24 200 60 100 150 5 a

7378 6-24 60 30 20 100 a 20

7379 15-30 300 500 100 200 a a

7380 9-26 80 100 3000 100 5 a

7381 9-17 20 15 50 10 5 20

7382 9-18 30 5 50 10 a 10

7383 12-18 700 200 3000 200 a a Be 20

7384 6-12 80 30 70 200 10 10

7385 6-24 150 30 50 200 5 a

7386 6-18 80 30 25 200 5 a

7387 9-30 500 150 "1500 50 a a Be 10

7388 9-14 20 20 25 50 a a

7389 12-18 20 10 25 500 a 20 Be 20

7390 9-12 10 10 25 50 a 20

7391 3-10 20 10 20 150 a 10

7392 12-17 30 20 50 200 20 a

7393 '18-34 30 30 50 100 a 10

7394 9-30 12 12 20 10 a 20

7395 15-30 500 200 5000+ 100 a 500 Be .30

7396 12-30 150 200 5000 50 5 5000 Be 30

7397 15-30 500 200 700 150 a 700

7398 15-33 70 80 200 50 5 700

7399 9-35 20 20 20 70 a 10

7400 0-11 40 12 50 150 10 50 7401 0-5 40 15 100 200 20 50

7402 3-21 40 12' 70 150 10 30

7403 3-11 40 20 150 200 30 70

7404 0-11 15 5 100 200 70 30

. . \ . \

Sample No. Depth (ft.) Ni Co

Mt. Burton?

108N/142N 10 5

46lJ/146W 5-12 80 30

104N/144W _ 300 80

104N/146W 12 5

108N/144~~ 10 5 106N/142VI 0-1 40 20

106N/1441v 0-1 10 15

$8!N/146W 15 10

98N/148W 40 12

98N/150W 20 10

100N/146W 20 10

_ 100N/148i>T 15 -5 102N/146W 80 20

102N/148W 0-1 20 10

516.5N/126.9E 5- 5

Lab. Serial No. 1420, 1421

Spec. Plate Nos. 689, 6921 695~ 696

4.

Cu V Mo Pb Remarks

50 70 7 300

1000 300 100 500

3000 100 10 300

300 500 150 1500

25 70 5 200

200 200 10 2000

200 300 15 1500

200 150 15 300 200 - 200 20 1000

70 200 15 200

300 150 20 700

200 100 50 200

200 200 30 500

150 300 70 300

2 5- a a

\

Spectrographic Analysis of Geochemical Samples from Rum Jungle -Northern Territory.

"'.Jy

E.J. Howard.

Semi quanti tati ve estimations were made of the trace metal content of samples from Rum Jungle N.T. The sDmples were submitted by P. Pritchard as part of a geochemical survey of the area.

The following are,the results expressed in parts per milliop..

Brown? s West

Hole No. Depth Ni Co Cu V Mo Sn Pb

4370 8-18 15 10 10 10 : 3 a 20 4376 15-23 5- 5- 10 150 15 a 50 4377 20-33 5- 5- 20 70 10 a 100 4378 7i-18 5- 5- 20 70 20 a 20 4379 7!-18 15 30 15 30 a a 10 4380 10 10 5 30 70 20 a 20 4380 10-18 ,5- 5- 10 70 1U a 5 4381 7~ ... 18 15 5- ' 15 50 2 a 10 4382 7-i-18 10 5- 10 50 2 a 20 4383 7i--18 30 5 30 70 10 a 20 4384 12j-23 20 5- 20 100 20 a 30 4385 30-53 30 60 15 5 5 a 50 4386 7i-11 10 10 20 10 2 a 200 4387 5-30 10 5- 30 70 2 a 100 4388 7i--28 5 10 30 30 2 a 300 4389 7ft-30 5 15 30 30 2 a 300 4390 15-28 5 5 20 30 3 q 100 4391 7i-18 5 5 30 30 2 a 150 4-392 40-61 150 200 100 20 5 a 70 4392 25-40 150 60 100 30 7 a 50 4392 10-25 150 100 70 20 10 a 50' 4393 10-28 80 40 50 30 5 a 150 4394 10-35 20 10 20 10 7 a 50 4395 5-45 200 100 200 5- 2 a a

4396 10-23 30 15 30 30 10 a 70 '4397 5-17i 10 10 20 30 2 a I 70

4398 7i-35 80 100 30 30' 10 a 70 4399 2i--25 5- 5- 10 70 7 a 20 4400 5-20 5- 5- 5 30 5 a 10

'\ '.

2.

Hole No. Depth Ni Co 1'"" ..... V Mo Sn Pb \.r~1..

4"401 5-20 5- 5- 5 100 10 a 10 4402 5···,15 5- 5- 15 100 15 a 20 4403 5-45 100 100 200 20 a a 5 4404 5 ... 15 5- 5- " 10 50 10 a 20 4405 5-25 10 5 15 30 2 a 20 4406 5-25 ~o 20 15 10 a a a

4406 15 t 30 80 30 70 a a a

4407 5-15 10 5 30 200 15 a 70 4408 2·~-15 10 5- 30 200 20 a ",:'1

~~. '-4409 2i-25 300 60 200 100 a a a

4410 7i-19 5- 5- 20 200 20 a 50 4411 5-23 60 30 20 50 a a 30 4411 100 60 30 20 a a a 4412 100-48 60 30 50 50 5 a 20 4412 40-48 100 60 30 30 5 a " 10 4413 10-18 5- 5- 20 200 15 a 50 4414 12i-38 80 20 70 50 a a a

4415 15-28 5- 5- 50 150 20 a 20

Mt. Burton - Mt. Fitch 4100 " 8-44 30 20 70 50 5 a 20 4101 12-16 30 i5 20 .50 5 a 20 4102 12-32 30 10 100 300 20 a 30 4103 19-28 60 30 70 150 10 a 30 4104 12-18 60 30 100 100 7 a 20 4105 12-51 100 20 100 200 10 a 20 4106 2-8 60 100 30 70, 7 a 20 4106 16' 60 5 70 200 10 a 70 4107 14-44 100 20 30 30 2 a 5 4108 14-32 80 20 30 30 2 a a

4109 4' 5- 30 15 5- 5 a a

4125(37N/ 125E ) 10-26 5 30 20 50 5 a 20

4124 8-30 10 40 20 30 2 a 50 4123 16-46 10 30 20 10 2 a 50 4122 8-14 10 10 30 20 2 a 50

3.

Brown's West Hole No. Depth Ni Co C'" "'- V Mo Sn Pb

4300 10 10 15 5 2 a 5 4301 15 10 15 5 5 a 10 4302 10 10 10 5- 2 a 10 4303 15 15 15 5 3 a 50 4304 15 15 15 10 5 a 5

Brownt s Intermediate Copper Prospect 40'10 TIoH 40 15 20 '[00 20 a 20 4015 BoH 30 15 70 100 30 a 20 4019 BoH 24' 40 10 300 150 2 a 100 4020 BoH 60 1 150 150 5000+ 200 30 a 70 4022 BoH 30 80 5000+ 200. 20 a 70 4025 BoH 200 100 5000+ 200 30 a 70 4030 BoH 100 80 5000+ 200 30 a 50

'.'

4038 BoH 150 80 2000 200 30 a 70 ..

4041 BoH 300 500 5000 300 15 a 50 ,'\

4045 BoH 16'500 700 5000+ 100 20 a 30 4046 BoH 300 500 5000 70 10 a 70 4050 BaH '500 300 3000 150 15 a 70 4055 BoH 42 300 1000 5000+ 150 10 a 70 4065 BoH 14t 150 1500 5000+ 150 5 a 50 4060 BoH 300 2000 5000+ 100 5 a 50 4083 6.8 f 150 40 2000 150 2 a 10

'. "

\

Beryllium and phosphorus were not detected in'any sample.

Plate Nos. 496-499.

REPORT NO. 167/NTS/1

THE PETROGRAPHY OF SHEARED GREYWACKE FROM THE PINE CREEK AREA, NORTHERN TERRITORY

by

W. R. Morgan

The specimen was submitted by D •• A. White for petro .... graphical examination, and was collected from an area 6 miles north-north-west of Pine Creek (Plane Table Sheet K, point 115).

The hand specimen is a hard, dark grey, inequigranular and medium-grained sandstone that has a faint sheer fabric.

In thin section (11087) the rock is seen to consist of grains of quartz, sodic plagioclase 7 chert, intermediate volcanic material, microcline-perthite, and granitic material, enclosed in a fine-grained quartz-sericite matrix. The grains range in diameter from 0.05 mm. to 0.53 mm., and are mostly angular. Some .show the effects of straining, but not obviously so.

The matrix has an average grain-size of about 0.02 mm., and shows a fairly promi~nt shear-texture, due mainly to lineated and strung-out fine sericite flakes. Together with the sericite, the matrix consists of granular quartz and feldspar. In one or two places, some sign of possible contact metamorphism can be seen in that some of the matrix quartz has assumed a granoblastic texture, and a few of the matrix plagioclase grains form pellucid crys~als with only a small amount of multiple twinning. It .must be emphasized that these features are not present throughout the matrix; they are not present in the grains enclosed by the matrix.

• ."..

J , .~ \ ' , ,',

Report No. File No. 84NT/1

SPECTROCHEMICAL ANALYSIS OF SAlVIPLES FROM RUJlII JUNGLE,

nORTHERN TERRITORY. by E.J.Howard

Semiquantitative estimations were made of the trace metal content of geochemical prospecting samples from Rum Jungle, Northern Territory. The samples were submitted by P. Pritchard.

The following are the results expressed in parts per million.

Browns Intermediate Copper Prospect.

, : Hole No. DeEth (feet) Ni Co Cu V' Mo Sn Pb Remarks

4083 . 14-16 300 60 2000 300 5 a 20 4083 ,~t6-18 300 60 3000 150 3 a 20,

4084 ',1.: 6-8 10 15 300 30 a 1E> 50 I,

4084 8-10 15 30 700·' , 30 5 10 50 4084' 10-12' 60 60 1500,,' 150 10 a 50 4084 " - '12-22 150 60 2000 200 50 a 100 4084 22-32 80 40 5000 300 50 a 100 4084 BoH32' 100 100 5000+ 200 70 a 70 4086 10-20 300 1000 5000+ 20 3 a 70 4086 20-30 500 1000 5000+ 50 5 a 20 4086 30-40 1000 2000 5000+ 100 7 300 30 4086 40-48 500 1000 5000+ 50 2 150 20 4086 48-54 1000 1000 5000+ 70 5 200 30 4086 BoH54 1000 1500 5000+ 70 5 700 30 P 4090 12-20 10 15 100 100 15 150 50 4090 20-28 40 30 50 150 20 50 150 4090 28 30 30 70 100 15 a 70 4091 16-24 15 20 150 100 20 a 50 4091 24-32 30 20 100 200 30 a 50 4091 32-42 30 ' 30 70 100 20 a 50 4091 42-52 30 30 500 100 15 a 50 4092 8-14 300 60 3000 200 7 a 20 4092 16-24 10 20 300 300 20 a 20 4092 24-32 30 40 500 300 30 a 30 4092 32-42 80 80 2000 150 70 a 50 4092 42 300 200 5000+ 200 50 a 50 4093 18-28 150 700 1500 30 5 a 50 4093 28-38 300 1000 5000 50 7 a 30 P 4093 38-48 300 1000 5000 100 10 a 20 P 4093 BoH48 300 700 5000 70 10 a 10 P 4094 4-8 10 15 50 5 2 a 20 4094 8-12 40 15 100 20 2 100 30 4094 BoH12 30 20 150 5 2 20 10 4087 4-8 500 2000+ 5000+ 70 7 a 30

.' Hole No.

4087

4087

4088

4088

4088

4088

4088

4089

4089

4089

4089

,4089

fepth feet)

Ni

.;.. 2 -(

Co Cu

8-12 500 2000+ 5000+

BoH12

10-14

24--32

500 2000+ 5000+

40· 100 3000

30 30 5000

32-40 100

40-48 200

BoH48 300

12-16 30

16-26 30

26-34 20

34-42 40

100 2000

200 3000

700 5000 80 qoO 60 700

60 1000

80 5000

42 300 1000 5000

Brown's West

4370

4370 4376

4377

4378

4379 4380

4381 4382

4383

4384

4385

4386

4387

4388

4388

4389

4390

4391

4392

4393

4394

4395

4396

4396

4-397

4398

4399 4400

BoH

BoH BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

20-28

BoH

BoH

BoH

BoH

BoH

BoH

10 15 30

10 10 15

5- 5- 15 5- 5- 20

5- 5- 50 5- 20 20

5- 5- 15 10

10

100

5-200

5 5-5-5-5-

10

5--300

150

5- 15 5 20

5 200

5- 20

150 50 10 20

5- 50

5 30

5- 20

5- 20

40 30

BoH 60

BoH45 300

5- 30

300 100

150 70 30 100

30 15 15 100

1070

BoH

20-23 BoH18

BoH35

BoH25 BoH20

40 20

10

100

5-5-

10 30

60 70

5- 15

5- 10

V Mo

70 7 50 5

300 10

100 50

200 20

200 15 200 10

200 a

200 5 200 10

200 20

200 10

5- 2

5- 2 100 30

30 5 150 20

100 a

150 20

70 2

30 3 200 15

100 20

30 15

50 5 70 a

10 a

5 a 5 a

50 2

70 2

30 5 50 7 20 10

5- a 30 3 20 5

30 2

30 15

50 7 30 3

Sn Pb Remarks

a 50

a 20

a 20

a 150

a 100

a 70

a 100

;} 100

a 10 a 100

a 100

a 100

a 20

a 20

a 5

a 30

a 50 a a

a 50

a 10

10 20

a 30 a 20

a 30 a 200

a 200

a 150 a 200

a 200

150 200

a 200

a 150

a 150

a 70 a a

a 70. a 100

a 100

a 50

a 10

a 10

Be(20)

Be(30)

Hole No.

4401 4402 4,403 4404 4405 4406 4407 4408 4409 4410 4411 4411

4412 44·12 4412 4413 4ct 13 4414 4'l14· 4414 4415 4416 4420

fepth feet)

BoH20 BoH15 . BoH45 BoH15 BoH25 BoH25 BoH15 BoH15 BoH25 BoH BoH Spec. sample BoH 20-30 30--40 BoH

7~-20

10-22i 25 BoH BoH

10-18

(W124/S20) 17i-25 4417 BoH 4417 4416 4420 (W122/S0) 4418 4418 4418 44·19 4419 4419 4419 (W122/S2) 4419 Llr419

10-33 BoH

BoH

17-37i '371t-43 BoH

7i-17i 20-36 32-35

32-40 42-53 BoH

Ni

5-5-

150

5-10 60 20

5-200

5-80

80 30 60

5-5-

15 60

100

5-5-

30 5-5-5-

30 10

5-5-

30 80

100

100 100 150

-) -

Co

5-5-

100

5-10 60 10

5-

Cu

15 20 50 15 30 70 20

10 30 200 5- 20

20 50

10 30 15 40 5-5-

10 10 20

5-5-

15 20 50 20 10 15 20 50 50 20 15

10 30 5- 15 5-5-

15 5-5-5-

20 20 20

30 40 30

15

50 20

15 15 50 70 50

50 30

150

V Mo Sn .Pb Remarks

100 20 100 20 100 a

150 20 100 7 150 a 200 20 100 10 100 a

200 15 70 a

50 a

50 30 70 5 50 5

150 15 10 2

5- a

5 a

20 5

50 20 100 15

30 3 50 7 50 5

150 15

20 7

5- 10 5- 7 5- 5

50 2

5- a

10 2

5 2

5- 7 5- 5

al a 20 a 10 a 50 a 10 a 10 a 70 a 20 a

a

a

a

a

a

a

a

a

a

a a

a a

a

50 a

10 a

5

5 50 10 a

a

a

50 50

a 70 a 20 a

a

a

a

a

a

a

a

a

a

a a

10 10

70 50

a

a

100 70 50

70 50 20

Be(10) Be(5)

Be(5) Be(10)

Hole No.

5220

5222

5223 5224

5225 5226

5227 5228

5229 5215

5236

5237 5238

5239 5240 5241 5242

5243 5244 5245 5246

5247 5248

5249 5252 5253 5251 5230

5231 5232

5233 5234 5235 5236 5237 5238 5239 5240

5241 5242

5243 5244

fept~ fee )

BOH30

16

16 10

18

14 38 14 BoH

2-6 2-6

2-6

2-4

2-6

2-4 0-2

2-4 0-8

2-6 2-4 2-6

2-4

0-4 2-6

0-6 0-6 0.:...4

28

10

10

4 38

34 BoH BoH BoH BoH BoH BoH BoH BoH BoH

- 4 -

Ni Co Cu V Mo Sn Pb Remarks

20

20

40 200

15 150

30 15 . a 10 5 a a 200

----------- No Result -------------10 15 20

5- t:;- 30

5- 5- 10 300 ,80 200

5- a a 30 a 20

~\ 10

a a

10 5- 50

5- a

5 3 5 a

5- a a 50 Be( 10)

----------- No Result -------------5- 5- 50

10 40 500 80 80 300

150 100 1000 100 80 500

10 5

5- 2

5 2

5- 5 5 2

a 20

~i: a

a a ti. a a 30

----------- No Result ------------------------ No Result ------------------------ No Result ------------------------ No Result -------------

150 300 200 70 10 a 20

,150 80 200 300 700 700

10 7 a

200 70 a

20 Be ( 10)

70 200 80 70

150 100 30 100 60 50 100 80 300 150 100 500 60 40 50

150 200 1000

80 4·0 500 80 60 200

60 30 70 500 200 20

200 7 a 200 10· 20

150 15 10 200 10 10 70 ,7 a

150 15 10 30 10 a

50 2 a 30 a a

200 20 a

150 20 . a

----------- No Result 60 80 1500 5 a a

150 40 30 700 300 1500

5- a 5 . 3

a

a

30 20 20

70 50 50 10 Be(10) 10

10

30 20

a Be(15) a Be ( 10)

a Be(10)

----------- No Result 50 20 100 10 2 a 50

----------- No Result 300 200 2000 5 a a 10 Be(15)

----------- No Result -----~----- No Result

Hole No.

5245

5246

5247 5248

5249

5251

5252

5253

5254

5255

5256

5257

5258

5259

5260

5261 5262

5263

5264

5265

5266

5267

5268

5269

5270

5271

5272

5273

5273

5274

5275 5276

5277 5278

5279 5280

5281 5282

5283

5284

5285

5286

5287

fepth feet)

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH BoH

BoH

BoH

BoH BoH( 1)

BoH(2)

BoH

BoH

BoH

BoH

BoH

BoH

"BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

- 5. ~

Ni Co Cu V Mo Sn Pb Remarks

300 300 300 30

200 300 1000 10

80 40 30 300

300 200 30 100

150 60 50 150

40 30 50 200

200 100 300 150

----------- No Result

----------- No Result

----------- No Result

----------- No Result

100 80 300 20

200 150 500 30

300 40 200 100

100 40 500 100

----------- No Result 80 40 500 100

150 60 100 150

300 80 500 100

2 a 10

7 a 10

15 a 20

a 10 10

10 10 20

10 20 50 -2 a 30

5 a 50 5 a 100

a a 70 a a 30

2 a 100

2 a 10

5 a 70. 700 300 700

700 700 700

300 500 1000

100 30

150 15 200 a

a 10

a 30

a 5 a 200

a 70

a 50

a 50

60 30 200

10 10 100

15 15 200

100 60 300

50 5 10 2

5 2

5- 5 ----------- No Result 20 30 70 5

30 40 70 5

300 150 3000 5

a 10 a

a 10 a

7 a 5 Be ( 10)

300 300 5000+ 10 2 30 50 P

150 80 2000

15 15 100

15 15 100

10 10 70

100 150 700

150 100 1500

150 500 1000

200 150 500

150 500 1500

5 2 a a B8(15)

20 a

30 a

50 a

100 5

100 15

50 20

30 15

100 30

a 20

a 50 a 100

a 50

a 50

a 70

a 50

a 50

----------- No Result -------------200 200 1500

300 200 2000

100 5 150 a

a 10

a 30

.,

'.

Hole No.

5288

5289

5290

5291

5292

5293

5294

5295

5296

5297

5298

5299

5300

5301

5302

5303 5304

5305

5306

5307

5308

5309

5310

'5311

5313

fiPth eet)

BoH

BoH

BoH

BoH

BoH

BoH

,BoH

BaH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

5314 ' BoH (442N/113+50)

5314 BoH (442/112+50)

5315

5316

5317

5318

5319 5320

5321

5322

5323

5324 , 5325

5326

5327

5328

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

BoH

,.. 6 -

Ni Co Cu v Mo Sn, Pb Remarks

150 70 3000 30 a a a

60 20 2000 150 a a a

60 100 700

80 150 300

5- 10

50 15

70 20

70 70

50 10

a 30 Be(15)

a 20

300 1500 500

200 700 500

',50 200 200

80 60 70

60 60 200

300 500 200

a 30

a, 50 a 20

200 5 a 70

100 2 a 20

10 20 60 100 200

300 500 700

300 200 500

200 200 1000

100 150 200

100 10 a

20 10 a

10 10 a 20 Be(15)

5- 5 a

5- 7 a 150 5 a

5 Be(20')

20 Be(10)

20

60 80 200 150 5 a 10

30 60 5 70 2' a 5 50 30 80 200 5 5 a

30 80 500 30 40 200

150 500 1000

100 300 500

100 100 500

100 80 500

100' 100 70

30 a 30 a 20 a

30 a 50 5 30 10

50 10

----------- No Result

30 60 15 150 20

80 40 500 5 2

80 80 500 20 5 100 300 200

80 200 500

80 SO 500

5- a 10 20

100 100

----------- No Result 60 60 1000 5-

100 80 200 10

20 20 50 5------------ No Result ----~------ No Result

a

50

5

a 500 a a

a' 5 a 5 a 5 a 5 a 50

a 20

a 10

a 20

a 5 a 20

a 100

a a

a

a

5 a

100 150 1000 10 20 a 20

10 30 200 10 2 a a

----------- No Result

Be(5)

'.

Hole .No.

5329

5330

5331 5332

5333 5334

5335 5336

5337 5338

5339 5340

5341

5342

5343

5344 5345 5346

5347 534·8

5349

5350 5351 5352

5353 535 f t-

5355 5456

5357

5358

5359 5360

5361 5362

5363 5364

5365 5366

5367 5368

5369 5370

5371

fep~~ fee )

BoH BoH BoH BoH BoH BoH BoH BoH BoH

. BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH BoH

, BoH

BoH BoH BoH BoH· BoH BoH 'BoH BoH BoH BoH BoH BaH BoH BoH

Ni

30 100

30

- 7 -

Co· Cu

30 100 80 1000

80 100

30 40 200

100 100 30

150 300 200 80 80 200

10 10 200

30 80 500

20 60 100

80 100 700 100 -80 200

200 80 200

30 40 300 80 60 500

40 60 50 40 80 300 20 20 50

80 80 700

20 40 70 80 80 200

80 80 200 60

30 60 20

80

15 20

40 200

30 300

40 500 20 150 80 200 20 30'

30 50 100 80 700

30 30 500 100 60 700

30 60 50

30 30 300

10 15 50 40 80 70 20 20 100

15 30 50 40 40 70 80 20 100

80 40 200

60 20 200

150 100 500

v Mo

5 3 20 20

50 7 10 20

5 a 5 a

5 a 5- a

10 a

5 2

10 a

10 a

10 2

5 7 10 5 5 a

10 a 5 2

10 2

5 2

10 2

5- 20 20 20

10 5 5 a

10 . 5

10 10

5 a 5- 2

5- a 5 a 5- a

5 a 10 2

5 a

5 a

5- a 5 a

10 a

50 5 70 2

150 15 150 2

Sn Pb Remarlm

a a

a 20

a 30 a 10

a a

a 10 a a

a 10

a 20

a a

a 5 a 5 a 5 a 10

a 5 a a

a 5 a 10

a 10

a 10

a 150 a -10 a 20

a 10

a 5 a 30

a 70

a 50

a 15 a 30 a 10

a 50

a 70 8 1000

a 70 a 1000

a 200

a 200

a 700 a 200 a 1000

8 5000 10 200

-... 8 -

, ,.

Hole No; fiPth Ni .co Cu V Mo' Sn Pb Hemarks eet") 0.0....- --

5372 BoH 30 15 150 30 2 a 70 5373 BoH 60 15 100 50 2 a 70

5374- BoH 10 5- 50 150 10 a 100

5375 BoH 60 40 200 70 7 a 500 5376 BoH 100 80 100 20 a a 200

5377 BoH 30 30 100 30 5 a 200

5378 BeH 60 30 70 30 3 a 100

5379 BoH 20 20 50 20 2 a fO 5380 BoH 60 60 70 30 2 a 100 5381 BoH 20 20 70 20 a a 50 5382 BoH 20 20 20 20 a a 20 5383 BoH 20 20 30 10 2 a 70 5384- BoH 60 60 100 20 5 a 70 5385 BoH 10 20 15 5- a a 5 5386 BoH 10 15 10 20 a a 20 5387 :SoH 40 60 150 50 a a 500

"a" - not detected

" 5" less than 5 p.p.m.

" P" - Phosphorus present "Be(10)" - 10 p.p.rn. beryllium "No Result" Poor arcing properties using general procedure

Plate Nos. 500-517.

Report No. 84NT/1

Mineragraphic description of mineralisation in Rum Jungle core, drill hole D.G. 24.

by

I.R. Pontifex.

Introduction

The investigation of 6 selected specimens from this hole was made in conjunction with the detailed logging of the core by D.O. Zimmerman and the proposed chemical analysis of selected sections by A.D. Haldane. The specimens 'were taken from cuttings representing 5 ft. intervals in the hole.

Summary

The entire core is extensively leached and silicified. Only minor occurrences of mineralisation are intersected by the hole and the distribution of this is sporadic. With the

exception of a specimen examined from 205' to 210' which consists entirely of psilomelane, the ore minerals consist mainly of chalcocite with relatively accessory amounts of bornite, malachite pyrite, hydrated iron oxide, native Cu and ?native Au.

In two sections from 250' to 251' chalcopyrite is altered to secondary copper minerals. This chalcopyrite has been extensively leached and as a result, along grain boundaries and fractures it has been altered to bornite and chalcocite and these respectively represent successive stages of iron removal from the original chalcopyrite. The removed iron has concentrated as hydrated iron oxide in the centre of the alteration veins and this forms the beginning of gossan boxworks. Pyrite shows no evidence of incipient boxwork development.

In a silicified rock from 350' to 355' chalcocite stringers follow grain boundaries which often have a rhombohedral shape. These boundaries were inherent to tho component grains pre-silicification.

Native Cu and ?Au in 2 samples from 350' to 355' occur as fine grains which are loc·a.lised in leached vOids within massive siliceous gangue.

C onclusi ons

Chalcopyrite is the only primary ore mineral observed in the core. The alteration of chalcopyrite to secondary copper minerals, in situ, is the result of the widespread leaching. The common occurrence of secondary copper minerals which are not spatially related to any primary minerals, (and in fact are present at greater depth than the intersected chalcopyrite) may represent the complete alteration of pre-existing primary minerals in situ. The mode of occurrence of these secondary minerals however indicates that they were introduced by supergene agencies. The relationship of chalcocite to inherent grain boundaries suggests that it was introduced before or contrmporaneously with the silicification of the enclosing country rock. The localisation of native Cu in leaChed voids suggests that it was introduced and deposited post-silicification or possibly contemporaneously with it. The native elements are not evident in the hand specimen and were only detected because the sections were examined for a microscopic study of minor copper mineralisation.

.. 2 •

It is suggested that the two specimens indicated are assayed for gold and copper content in the subsequent chemical analyses.

Depth - 205' to 210' Ore minerals - PSilomelane.

Macro - The specimen consists entirely of an aggregnte of radiating stalactitic columm of a soot black, soft mineral.

Micro - Micro chemical test indicated the presence of Mn.

The entire section has a fine felted ice flower-like texture and consists of a grey-white mineral of strong anisotropism. The mineral is psilomelane.

Although occurring alone, associated core cuttings consist of leached, silicified calcareous material. Psilomelane is recorded to occur as a replacement product in calcareous or dolomitic rocks, formed by meteoric waters.

Depth - 250'11" to 25117" (2 specimens were eXamined)

Ore minerals - Chalcopyrite, chalcocite, bornite, hydrated iron oxide pyrite, marcasite.

Macro Buff coarsely crystalline dolomite contains chalcopyrite which is ramified by a network of chalcocite.

Micro - Massive chalcopyrite is ramified by a net-work of alteration veins of chalcocite and other secondapy minerals. The chalcopyrite occurs as remnant isolat-ed irregular shaped grains up to 5 mms. across, essentially filling -chG cells produced by the secondary minerals. The grains are leached and as a result they are often extremely porous and in polished section they have a marked low relief in relation to the surrounding secondary minerals which replace them. The chalcopyrite is replaced around grain boundaries and along fractures within the grains.

The width of the replacement veins and coronas varies up to a maxiIIl'Um of 3 mms,. and this expresses the variation in the degree of alteration. The wider veins comruonly consist of 3 secondary products. Hydratediron oxide forms a central core as the innermost constitu-ent of the vein.

ChalCOCite is the most abundant and widespread of the secondary minerals and this borders the hydrated iron oxid~ on the Side nearest the chalcopyrite, or in the case of some veins replacing along fractures, on both sides. Often Chalcocite is the only secondary mineral in anyone vein.

Bornite is in places assoc~ated with chalCOCite and it forms irregular poorly defined zones between chalcocite and chalcopyrite. Bornite often merges with feather like prOjections into adjacent chalcocite and chalcopyrite, without any distinctive boundary.

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Accessory amounts of small pyrite grains are dispersed through the chalcopyr1te and may occur independently in the gangue. The distribution of pyrite is apparently at random, however some grains are, strung. 9Ji\~::h str¥.m.e~'.3.1!;'if~~W1ally parallel to chalcoc1 te ve1ns I "·Th1S Q1rErd-t":lon may be a crystallographic direction within the chalcopyrite. Marcasite often partially replaces pyrite grains.

Depth-350' to 355' Ore minerals - Chalcocite, malaohite, native Cu.

Macro -

Micro -

Reddish dense siliceous rock with sporadic distrib­ution of skeletal masses of chalcocj,te and associated malachite which measure up to several roms. acruss.

Several discrete irregular p3tches and veins of chalcocite occur at random through the section. It makes up about 5% of the section. Some chalcocite veinlets cut dense siliceous grains, the larger masses however, are localised in irregular apparent leach voids in the siliceous mass.

Approximately 3% of the section consists of fine grains of native Cu which are dispersed at random with an even distribution throughout. The maximum size of these grains is about 0.075 mms. across and they are invariably localised within irregular leached voids in the siliceous aggregate.

Depth - 350' to 355'

Ore minerals - Chalcocite, native Cu, ?native Au.

Macro

Micro -

Buff grey silicified fjne grained rock. A fracture face in the rock is lined with fine quartz crystalS.

The entire rock is ramified by veinlets and stringers of chalcocite. These veins almost invariably follow grain boundaries inherent to the component grains which existed before the rock was Silicified. Often the grains have a rhombo-hedral outline suggesting that the pre-existing rock was a carbonate. In anyone field of view the Chalcocite constitutes less than 3% of the minerals present.

Minor accessory amounts of highly reflective grains of the order of 0.001 mm. in size are dispersed sporadically through the section and there are localised in intergranular voids. The id·entification of these grains was not conclusive, they do however, appear to be grains of native Cu as found in another section in this depth range. Some are possibly grains of native Au.

It is suggested that this section is analysed for gold in the subsequent chemical analyses,

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