Certificate Certified Reference Material

AMIS (A Division of Torre Analytical Services (Pty) Limited)

(Reg. No. 1989/000201/07)

A: 11 Avalon Road, West Lake View Ext 11, Modderfontein, South Africa

P: PO Box 856, Isando, 1600, Gauteng, South Africa

T: +27 (0) 11 923-0800

W: www.amis.co.za

Directors: C E Pettit (British), R Naidoo, N N Robinson, K V Gerber, M Padayachee

AMIS0457

Certificate Certified Reference Material

Merensky Concentrate Mortimer Anglo American Platinum, South Africa

Certificate of Analysis

Recommended Concentrations and Limits1. (at two Standard Deviations)

Certified Concentrations2

Pt Pb Collection 77.3 ± 8.7 g/t

Pd Pb Collection 41.2 ± 2.7 g/t

Pt NIS 79.2 ± 4.4 g/t

Pd NIS 41.8 ± 2.1 g/t

Au NiS 1.6 ± 0.2 g/t

Rh NiS 13.7 ± 0.9 g/t

Ir NiS 4.8 ± 0.5 g/t

Ru NIS 19.5 ± 2.1 g/t

Co M/ICP 397 ± 24 ppm

Co P 362 ± 29 ppm

Co XRF 461 ± 57 ppm

Cu M/ICP 7741 ± 353 ppm

Cu P 7455 ± 379 ppm

Cu XRF 8301 ± 734 ppm

Ni M/ICP 1.31 ± 0.099 %

Ni XRF 13434 ± 368 ppm

Cr M/ICP 11109 ± 2245 ppm

Pb M/ICP 160.2 ± 17 ppm

Specific Gravity 3.15 ± 0.16 Dimensionless

Provisional Concentration

Au Pb Collection 1.54 ± 0.17 g/t

PGM 4E = Platinum (NiS) + Palladium (NiS) + Rhodium(NiS) + Gold (NiS) = 136.3 g/t

1. Manufacturers recommended limits for use of the material as control samples, based on two standard deviations, calculated using “Between Laboratory” statistics for treatment of the data for trivial, non- trivial and technically invalid results. See sections 1, 9 and 12.

2. There is additional certified major element data on p2 and uncertified trace element data as an appendix.

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(Reg. No. 1989/000201/07)



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Major Element Recommended Concentrations and Limits

(at two Standard Deviations)

Certified Concentrations (Mixed ICP and XRF)

Al2O3 2.92 ± 0.05 %

CaO 2.35 ± 0.07 %

Cr2O3 1.65 ± 0.04 %

Fe2O3 14.50 ± 0.29 %

K2O 0.090 ± 0.004 %

MgO 23.0 ± 0.36 %

MnO 0.14 ± 0.01 %

SiO2 47.2 ± 0.86 %

TiO2 0.24 ± 0.01 %

LOI 4.50 ± 0.46 %

Provisional Concentration

Na2O 0.20 ± 0.05 %

1. Intended Use: AMIS0457 is a certified reference material which may be used to demonstrate the validity of measurement results of a single analysis of PGE, Cu and Ni ores; derived from the Merensky Reef, or from other mafic rocks with a similar grade and matrix. It is a matrix matched Certified Reference Material, fit for use as control samples in routine assay laboratory quality control when inserted within runs of samples and measured in parallel to the unknown. Its purpose is to monitor inter-laboratory or instrument bias and within lab precision. It can be used, indirectly, to establish the traceability of results to an SI system of units. The recommended concentrations and limits for this material are property values based on a measurement campaign (round robin) and reflect consensus results from the laboratories that participated in the round robin. Slight variations in analytical procedures between laboratories will reflect as slight biases to the recommended concentrations (see 19). Good laboratories will report results within the two standard deviation levels with a failure rate of <10 %. The material can also be used for method development and for the calibration of equipment. 2. Origin of Material: This standard was made using Merensky concentrate material supplied by Anglo Platinum Limited from the Western Limb of the Bushveld Complex.



(Reg. No. 1989/000201/07)



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3. Mineral and Chemical Composition: This material is predominantly or wholly derived from Merensky Reef which comprises components of feldspathic pyroxenite, pyroxenite and anorthosite. Peak PGE values are associated with a thin chromitite stringer. Mineralization in this Merensky Reef comprises 2-5% disseminated or net textured magmatic sulphides, predominantly pyrhotite, pentlandite, chalcopyrite and pyrite. The PGE’s occur as micron-sized satellite grains around but rarely within the sulphides 4. Appearance: The material is a very fine powder. It is colored a Medium Dark Grey 5. Handling instructions: The material is packaged in Laboratory Packs and Explorer Packs that must be shaken or otherwise agitated before use. Normal safety precautions for handling fine particulate matter are suggested, such as the use of safety glasses, breathing protection, gloves and a laboratory coat. 6. Method of Preparation: The material was crushed, dry-milled and air-classified to <54um. Wet sieve particle size analysis of random samples confirmed the material was 98.5% <54um. It was then blended in a bi-conical mixer, systematically divided and then sealed into 1kg Laboratory Packs. Explorer Packs are subdivided from the Laboratory packs as required. Samples were scientifically selected for homogeneity testing and third party analysis. Statistical analysis of both homogeneity and the consensus test results were carried out by independent statisticians. 7. Methods of Analysis requested:

1. Pt, Pd and Au. Pb collection with Ag as a co-collector, ICP-OES or ICP-MS 2. Pt, Pd, Au, Rh, Ru, Ir NiS collection, ICP-OES or ICP-MS 3. Multi element scan to include Co, Cu and Ni. Multi-acid total digestion, including HF, ICP-

OES or ICP-MS 4. Co, Cu and Ni. Aqua regia digestion with ICP-OES or ICP-MS 5. Co, Cu and Ni. Pressed pellet XRF 6. Majors ( Al2O3, CaO, Cr2O3, Fe2O3, K2O, MgO, MnO, Na2O, SiO2, TiO2. LOI ) XRF fusion 7. SG – gas pycnometer

8. Information requested:

1. Aliquots used for all determinations. 2. Results for individual PGM's reported in ppb. 3. Results for base metals reported in ppm. 4. QC data, to include replicates, blanks and certified reference materials used. 5. Analytical techniques used.

9. Method of Certification: Twenty one laboratories were each given eight scientifically selected packages of sample. Eighteen of the laboratories submitted results.



(Reg. No. 1989/000201/07)



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Final limits were calculated after first determining if all data was compatible within a spread normally expected for similar analytical methods done by reputable laboratories. Data from any one laboratory was then removed from further calculations when the mean of all analyses from that laboratory failed a “t test” of the global means of the other laboratories. The means and standard deviations were then re-calculated using all remaining data. Any analysis that fell outside of the new two standard deviations was removed from the ensuing data base. The mean and standard deviations were again calculated using the remaining data. The “between-laboratory” standard deviation is used in the calculation to eliminate technically and statistically invalid data. Upper and lower limits are based on the standard deviation of the remaining data, which reflect individual analyses and can be used to monitor accuracy in routine laboratory quality control. This is different to limits based on standard deviations derived from grouped set of analyses (see 12), which provide important measures for precision and trueness, but which are less useful for routine QC. Standards with an RSD of near or less than 5 % are termed “Certified”, RSD’s of between near 5 % and 15 % are termed “Provisional”, and RSD’s over 15 % are termed “Informational”. 10. Participating Laboratories: The 18 out of 21 laboratories that provided results timeously were (not in same order as in the table of assays):

1. ACME Analytical Laboratories Ltd CA 2. ALS Ammtec (Australia) 3. Anglo Platinum - Mogalakwena Analytical Laboratory (MPL) 4. Anglo Platinum – RPM Rustenburg Laboratory 5. Anglo Research (Germiston Campus) 6. Bureau Veritas (Namibia) 7. Genalysis Laboratory Services (W Australia P) 8. Intertek Utama Services (Indonesia) 9. Mintek (South Africa) 10. Set Point Laboratories (Isando) SA 11. SGS Ankara (Turkey) 12. SGS Geosol Laboratories Ltda (Brazil) 13. SGS Mineral Services Lakefield (Canada) 14. SGS South Africa (Pty) Ltd - Booysens JHB 15. Suntech Geometallurgical SA 16. Ultra Trace (Pty) Ltd WA 17. Zimplats Ngezi Lab 18. Zimplats SMC Lab

11. Assay Data: Data as received from the laboratories for the important certified elements listed on p1 are set out below.



(Reg. No. 1989/000201/07)



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Pt Pd Au Pt Pd Au Ir Rh Ru Co Cu Cr Ni Pb PbColl PbColl PbColl NiS NiS NiS NiS NiS M/ICP M/ICP M/ICP M/ICP M/ICP

g/t g/t g/t g/t g/t g/t g/t g/t g/t ppm ppm ppm ppm ppm

71.37 41.50 1.62 78.20 40.90 1.50 4.89 13.50 19.90 382 9090 11200 13600 167

72.93 39.91 1.52 74.50 40.70 1.74 4.72 13.30 19.50 392 9040 11400 13605 171

72.89 40.53 1.42 79.40 42.00 1.60 5.06 13.90 20.20 377 9870 11300 11990 181

70.84 40.38 1.55 78.70 41.30 1.74 5.10 13.50 20.20 409 9940 11300 13545 172

71.88 42.76 1.59 76.90 40.60 1.55 4.63 13.20 19.50 373 7600 11400 13555 168

72.04 38.78 1.47 78.40 41.90 1.58 5.07 13.90 19.90 387 8830 11300 13390 167

71.65 40.99 1.44 80.00 41.70 1.63 4.97 13.90 20.20 379 8570 11300 12840 177

73.02 38.57 1.48 76.70 41.00 1.54 4.97 13.50 19.80 380 7622 11400 12990 169

79.90 41.80 1.60 76.65 40.70 1.57 4.30 13.10 18.00 396 7693 9257 13000 154

82.80 35.20 1.24 79.95 40.74 1.60 4.40 13.30 17.90 394 7914 9599 13000 147

82.20 43.50 1.27 76.53 40.88 1.64 4.20 13.10 17.90 408 7935 9917 12800 155

73.70 40.60 1.56 78.26 41.05 1.65 4.80 12.20 19.50 400 7724 10146 12700 144

77.40 42.00 1.61 79.42 41.60 1.66 4.40 14.30 18.10 396 7586 10300 12800 144

79.80 43.80 1.55 78.54 42.48 1.63 4.30 13.30 18.00 382 7676 10322 12300 149

72.20 40.80 1.63 77.55 39.46 1.65 4.30 13.00 18.30 403 7741 10250 13000 154

77.30 41.30 1.56 79.33 42.48 1.65 4.91 13.50 19.69 398 7661 9715 12600 147

81.00 40.20 1.72 79.20 41.70 1.58 4.79 14.00 20.07 380 7613 11400 13409 117

83.20 40.90 1.71 80.70 42.50 1.58 4.90 13.33 20.23 368 7673 12600 12428 138

82.80 40.60 1.76 79.80 42.60 1.62 4.77 13.66 19.97 358 7351 12400 13023 136

79.20 39.50 1.69 80.20 43.70 1.61 4.99 13.46 20.23 343 7676 11800 13085 136

84.00 40.70 1.78 81.20 42.30 1.62 5.08 13.80 19.57 357 7651 12500 13152 134

85.30 41.30 1.74 81.10 42.40 1.55 4.99 13.89 19.06 381 7581 12100 13093 134

81.10 39.80 1.71 78.10 40.40 1.56 4.81 13.72 20.03 369 7759 12000 13407 125

81.00 39.70 1.64 79.30 40.90 1.57 4.86 13.87 17.60 355 7741 11700 12694 135

74.90 40.30 1.53 83.56 43.49 1.63 4.94 13.30 17.90 400 7356 12900 165

76.30 41.10 1.60 82.58 43.26 1.62 4.98 13.60 18.00 416 7854 13100 158

73.40 39.70 1.46 83.91 43.49 1.68 4.95 13.80 18.40 420 7842 13200 158

72.50 39.80 1.51 82.75 44.08 1.57 5.02 13.90 18.00 421 7773 13000 159

77.80 42.20 1.54 80.65 43.95 1.58 4.89 13.80 17.90 421 7828 12900 156

76.10 39.50 1.52 83.75 43.35 1.56 4.66 13.70 20.30 430 7805 13200 156

77.00 40.40 1.60 77.00 42.17 1.59 4.77 13.00 20.07 416 7793 13400 156

76.10 39.10 1.61 77.00 41.00 1.56 5.03 13.40 20.33 385 7820 13100 155

77.50 40.60 1.63 78.00 42.00 1.77 4.97 14.18 20.65 405 7920 12382 154

76.40 39.80 1.61 82.00 42.00 1.81 5.05 14.16 20.51 410 7880 12692 166

77.60 40.20 1.61 77.00 43.00 1.66 5.02 14.40 20.31 410 7790 12138 166

77.10 40.80 1.52 81.00 41.00 1.69 5.06 14.47 19.62 405 7670 12575 162

77.70 40.90 1.50 79.00 43.00 1.86 4.91 14.26 20.06 400 7860 12176 151

92.70 47.50 1.81 77.00 42.00 1.76 4.90 14.23 19.30 400 7880 12517 158

75.50 41.00 1.53 79.45 41.00 1.75 5.02 13.89 19.20 410 7830 12229 151

88.00 46.00 1.87 79.27 41.58 4.20 14.30 19.80 405 7085 12604 167

86.70 44.40 1.66 77.59 41.54 4.26 13.00 20.60 386 7079 13290 180

78.70 39.90 1.72 78.96 40.79 4.36 13.00 19.10 399 7080 12802 180

81.10 41.50 1.45 77.42 41.54 4.57 13.30 20.60 387 7190 12758 180

79.10 41.30 1.51 78.17 40.81 4.34 14.10 19.90 394 6946 12717 200

77.80 41.20 1.73 77.87 40.98 4.25 12.90 19.50 391 7177 12537 180

78.41 43.74 1.65 79.26 40.97 4.84 13.90 20.25 399 7021 12846 180

79.59 42.75 1.61 78.13 41.79 4.87 13.30 20.78 394 7097 12511 180

80.50 44.81 1.65 80.93 41.12 4.79 13.20 20.36 398 8050 12490 200

78.76 43.89 1.61 77.82 42.20 4.77 13.80 20.29 427 8028 12600 158

76.41 42.84 1.59 80.26 40.73 4.85 13.77 20.18 419 7878 12900 158

81.00 42.89 1.61 79.15 41.53 4.82 13.61 20.53 417 7745 12800 153

79.74 43.54 1.65 76.79 42.86 4.87 13.81 20.29 408 7658 12400 155

78.60 43.21 1.62 78.14 41.46 4.78 13.57 20.55 409 7825 12800 137

70.85 41.30 1.49 41.92 4.95 13.67 19.50 411 7755 12400 156

71.23 41.35 1.46 4.80 13.65 19.44 402 7754 12000 153

71.96 40.78 1.46 4.85 13.91 19.28 407 7027 13300 158

71.25 41.32 1.46 4.91 13.72 19.39 363 7570 13400 168

71.91 41.09 1.53 5.20 14.15 20.90 397 7503 12900 166

71.85 41.12 1.38 4.98 13.81 21.16 401 7349 12800 169

72.04 41.18 1.35 5.10 14.01 19.90 381 7466 13100 164

71.86 41.58 1.56 13.92 394 7272 13700 170

61.42 30.72 1.35 13.50 382 7012 13600 164

73.22 37.92 1.66 13.71 379 7398 13100 165

66.83 37.32 1.52 411 7800 13800 171

72.51 29.26 1.40 500 7900 14035

75.59 36.40 1.58 480 7800 13965

75.57 38.42 1.71 490 7800 14010

80.90 41.78 1.65 510 7800 13990

74.01 38.16 1.57 480 7700 13875

77.70 41.50 1.83 500 7900 13955

77.80 41.60 1.68 480 7700 13845

79.60 42.10 1.76 520 7860 13875

78.60 42.10 1.82 394 7840 13500

80.30 42.10 1.81 384 7690 13400

78.50 42.90 1.78 383 7655 13500

80.40 42.30 1.75 385 7655 13400

82.94 41.49 1.83 345 7605 13500

85.20 45.47 1.48 392 7580 13500

86.59 43.34 1.58 387 7615 13500

79.49 39.89 1.54 378 7729 13600

84.00 42.24 1.47 396 7406 9910

79.53 39.17 1.59 390 8109 8455

73.53 36.28 1.47 392 7462 8546

84.87 42.97 1.35 398 6873 8449

65.91 38.70 1.60 394 7261 11034

69.90 41.07 1.61 397 7555 8680

69.76 40.29 1.60 396 7345 8418

68.76 40.34 1.57 391 7940 9261

69.69 40.28 1.46 7990

69.88 40.38 1.48 7880

69.78 40.34 1.41 7860

69.76 40.35 1.44 7960

1.58 8000

1.43 7970

1.47 7960

1.47

1.48

1.48

1.47

1.47

1.47



(Reg. No. 1989/000201/07)



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Co Co Cu Cu Ni Al2O3 CaO Cr2O3 Fe2O3 K2O LOI MgO MnO Na2O SiO2 TiO2 SG P XRF P XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF XRF pyc

ppm ppm ppm ppm ppm % % % % % % % % % % %

389 494 8540 7900 13300 2.96 2.38 1.65 14.40 0.09 4.76 23.00 0.14 0.08 47.50 0.24 3.10

383 492 8450 7900 13500 2.95 2.34 1.63 14.30 0.09 4.77 22.70 0.15 0.08 47.30 0.23 3.11

374 488 8130 8100 13700 2.93 2.38 1.64 14.40 0.09 4.81 22.90 0.15 0.08 47.00 0.24 3.12

355 492 7920 7900 13600 2.92 2.36 1.65 14.40 0.09 4.76 22.90 0.14 0.07 47.40 0.23 3.09

392 497 8870 8000 13600 2.89 2.38 1.66 14.30 0.09 4.78 22.90 0.15 0.07 47.10 0.23 3.11

376 493 8650 8100 13700 2.95 2.40 1.64 14.40 0.09 4.69 22.90 0.13 0.07 47.20 0.24 3.11

389 491 7920 7800 13300 2.97 2.39 1.65 14.40 0.09 4.79 22.90 0.15 0.08 47.30 0.24 3.11

338 496 8250 8200 13900 2.92 2.38 1.65 14.30 0.09 4.77 22.90 0.14 0.09 47.00 0.23 3.12

347 452 7240 8322 13395 2.85 2.28 1.64 14.20 0.09 4.80 23.11 0.14 0.15 46.68 0.27 3.08

341 459 7456 8304 13325 2.90 2.29 1.66 14.32 0.09 4.78 23.12 0.14 0.16 46.71 0.26 3.05

354 452 7341 8318 13349 2.91 2.31 1.67 14.41 0.08 4.69 23.26 0.14 0.17 47.00 0.24 3.09

346 442 7468 8275 13299 2.87 2.28 1.65 14.23 0.09 4.74 23.08 0.14 0.16 46.60 0.25 3.09

334 458 7549 8343 13396 2.91 2.33 1.68 14.55 0.09 4.78 23.43 0.15 0.17 47.31 0.25 3.08

350 453 7189 8255 13287 2.89 2.31 1.68 14.51 0.09 4.77 23.31 0.14 0.17 47.04 0.24 3.09

338 447 7498 8223 13280 2.87 2.31 1.68 14.35 0.09 4.74 23.19 0.14 0.17 46.89 0.25 3.07

349 442 7518 8296 13384 2.89 2.31 1.68 14.42 0.09 4.76 23.35 0.14 0.17 46.97 0.25 3.07

362 450 7267 8900 13400 2.91 2.40 1.67 14.60 0.10 5.42 23.20 0.15 0.20 47.70 0.24 3.23

355 430 7393 8800 13300 2.93 2.42 1.67 14.60 0.09 5.45 23.10 0.15 0.21 47.80 0.25 3.23

357 440 7198 8900 13400 2.94 2.41 1.68 14.60 0.10 5.48 23.20 0.15 0.20 47.90 0.25 3.24

359 440 7176 8900 13300 2.92 2.41 1.68 14.70 0.10 5.46 23.20 0.15 0.20 47.90 0.24 3.23

355 440 7290 8900 13300 2.94 2.42 1.69 14.70 0.09 5.47 23.20 0.15 0.20 47.90 0.24 3.21

354 440 7199 8600 13700 2.94 2.41 1.68 14.70 0.09 5.50 23.20 0.15 0.21 47.90 0.25 3.20

357 430 7285 8800 13400 2.93 2.41 1.68 14.60 0.10 5.49 23.10 0.15 0.19 47.80 0.25 3.21

351 450 7027 8600 13300 2.89 2.41 1.66 14.60 0.09 5.48 23.10 0.15 0.21 47.70 0.25 3.21

350 7620 8100 2.92 2.37 1.64 14.34 0.09 4.54 23.00 0.13 0.22 47.44 0.24 3.06

366 7470 8100 2.94 2.36 1.65 14.35 0.09 4.51 23.10 0.14 0.21 47.48 0.24 3.06

341 7740 8200 2.91 2.37 1.64 14.36 0.09 4.54 23.00 0.13 0.22 47.46 0.24 3.06

370 7430 8100 2.93 2.37 1.64 14.40 0.09 4.52 23.00 0.14 0.22 47.44 0.24 3.05

365 7720 8100 2.95 2.38 1.65 14.39 0.09 4.53 23.20 0.14 0.22 47.51 0.24 3.06

347 7780 8200 2.92 2.36 1.64 14.35 0.09 4.50 23.00 0.13 0.21 47.51 0.23 3.06

361 7410 8100 2.93 2.37 1.65 14.43 0.09 4.48 23.10 0.14 0.21 47.54 0.24 3.06

378 7750 8100 2.94 2.36 1.64 14.35 0.09 4.48 23.10 0.13 0.21 47.48 0.24 3.06

375 7360 2.94 2.36 1.65 14.68 0.09 4.35 22.94 0.14 0.24 47.85 0.25 3.23

363 7534 2.94 2.36 1.65 14.70 0.09 4.44 22.91 0.14 0.25 47.99 0.24 3.25

367 7198 2.93 2.35 1.64 14.69 0.09 4.46 22.93 0.14 0.24 47.83 0.24 3.21

366 7291 2.96 2.35 1.65 14.68 0.09 4.32 22.93 0.14 0.24 47.76 0.24 3.20

371 7286 2.94 2.33 1.64 14.73 0.09 4.45 22.92 0.14 0.23 47.77 0.23 3.29

371 7344 2.94 2.36 1.65 14.75 0.09 4.36 23.06 0.15 0.23 47.90 0.25 3.21

374 7237 2.93 2.35 1.65 14.68 0.09 4.44 22.87 0.15 0.23 47.73 0.24 3.24

343 7368 2.95 2.37 1.66 14.73 0.09 4.24 23.03 0.15 0.25 48.04 0.25 3.23

341 7451 2.90 2.33 1.63 3.98 23.00 0.19 0.30 46.70 0.24 3.23 0.24 3.15

346 7461 2.90 2.35 1.65 4.03 23.10 0.17 0.20 46.70 0.24 3.25 0.25 3.17

353 7555 2.90 2.34 1.65 4.01 23.10 0.16 0.20 47.00 0.24 3.25 0.23 3.16

357 7720 2.90 2.31 1.62 4.09 22.90 0.16 0.20 46.60 0.24 3.23 0.26 3.17

352 7780 2.90 2.34 1.64 4.12 22.90 0.16 0.30 46.60 0.24 3.24 0.25 3.15

355 7713 2.90 2.34 1.64 3.89 23.10 0.16 0.20 46.70 0.24 3.24 0.26 3.16

351 7837 2.90 2.37 1.66 4.04 23.20 0.17 0.20 47.00 0.25 3.25 0.24 3.16

372 7668 2.90 2.34 1.64 3.89 23.20 0.16 0.30 46.80 0.24 3.25 0.25 3.16

381 8038 2.95 2.37 1.62 14.30 0.09 4.69 22.72 0.14 0.30 47.17 0.24 3.00

384 8243 2.91 2.36 1.62 14.37 0.09 4.61 22.81 0.14 0.33 47.25 0.24 3.03

383 8449 2.90 2.36 1.63 14.35 0.09 4.55 22.76 0.14 0.33 47.12 0.24 3.03

378 8297 2.95 2.35 1.62 14.21 0.09 4.57 22.75 0.14 0.34 46.91 0.24 2.96

417 8237 2.93 2.38 1.64 14.50 0.09 4.63 22.90 0.14 0.34 47.50 0.23 3.07

376 9125 2.94 2.34 1.61 14.15 0.08 4.63 22.66 0.14 0.31 46.80 0.24 3.03

384 8121 2.94 2.34 1.60 14.24 0.09 4.50 22.75 0.14 0.32 46.98 0.23 2.93

370 8379 2.94 2.36 1.64 14.30 0.09 4.66 22.75 0.14 0.34 47.26 0.23 3.13

371 7569 2.89 2.34 1.62 14.50 0.09 4.57 23.00 0.15 0.17 47.20 0.22

368 7462 2.89 2.32 1.61 14.40 0.09 4.56 22.90 0.15 0.18 47.10 0.24

370 7517 2.89 2.32 1.63 14.50 0.09 4.63 23.00 0.15 0.18 47.20 0.23

361 7437 2.90 2.32 1.62 14.40 0.09 4.59 22.90 0.14 0.17 46.90 0.22

363 7543 2.91 2.31 1.61 14.40 0.09 4.55 22.80 0.15 0.17 47.20 0.22

358 7552 2.92 2.35 1.65 14.50 0.09 4.55 23.00 0.15 0.19 47.30 0.23

362 7445 2.88 2.32 1.63 14.40 0.09 4.72 22.90 0.15 0.18 47.00 0.23

7475 2.86 2.31 1.60 14.40 0.09 4.71 22.80 0.14 0.18 47.00 0.24

3.27 2.32 1.58 14.57 0.09 4.06 22.59 0.15 0.21 46.65

3.22 2.27 1.59 14.50 0.08 4.02 22.78 0.16 0.21 46.74

3.27 2.32 1.57 14.58 0.09 4.13 22.60 0.15 0.20 46.75

3.27 2.31 1.56 14.57 0.09 4.16 22.59 0.15 0.21 46.65

3.21 2.32 1.58 14.49 0.09 4.15 22.60 0.15 0.21 46.56

3.20 2.32 1.61 14.55 0.09 4.07 22.70 0.16 0.23 46.84

3.22 2.26 1.57 14.50 0.08 4.05 22.70 0.16 0.23 46.57

3.25 2.27 1.59 14.54 0.08 4.10 22.81 0.16 0.23 46.87

4.99

4.98

4.90

4.90

5.48

5.49

4.97

5.28

4.20

4.20

4.20

4.30

4.30

4.30

4.30

4.40



(Reg. No. 1989/000201/07)



T: +27 (0) 11 923-0800

W: www.amis.co.za


12. Measurement of Uncertainty :(ref Dr Hugh Bartlett, Hugh Bartlett Consulting CC.) The samples used in this certification process have been selected in such a way as to represent the entire batch of material and were taken from the final packaged units; therefore all possible sources of uncertainty (sample uncertainty and measurement uncertainty) are included in the final combined standard uncertainty determination. The uncertainty measurement takes into consideration the between lab and the within lab variances and is calculated from the square roots of the variances of these components using the formula: Combined standard uncertainty=sqrt((between lab.var/no of labs) + (mean square within lab.var /no of assays))

These uncertainty measurements may be used, by laboratories, as a component for calculating the total uncertainty for method validation according to the relevant ISO guidelines.

Analyte Method unit S ' σL ² SW ³ CSU ⁴

Pt Pb Coll g/t 5.38 2.97 2.63 0.94

Pd Pb Coll g/t 2.56 0.77 1.25 0.27

Au Pb Coll g/t 0.127 0.037 0.075 0.014

Pt NiS g/t 2.21 1.57 1.43 0.62

Pd NiS g/t 1.07 0.74 0.77 0.30

Au NiS g/t 0.09 0.08 0.06 0.04

Rh NiS g/t 0.44 0.29 0.33 0.11

Ir NiS g/t 0.27 0.24 0.13 0.09

Ru NiS g/t 1.1 0.82 0.47 0.30

Co M/ICP ppm 34.08 8.34 8.30 2.96

Co P ppm 15.80 12.80 7.33 4.62

Co XRF ppm 28.52 45.54 5.99 26.32

Cu M/ICP ppm 493 105 133 36.7

Cu P ppm 454 183 121 76.6

Cu XRF ppm 367 500 99 250.5

Ni M/ICP ppm 1277 389 256 127

Ni XRF ppm 184 185 145 111

Cr M/ICP ppm 1123 1751 332 1013

Pb M/ICP ppm 16.00 8.98 4.44 3.72

Al2O3 XRF % 0.105 0.018 0.016 0.007

CaO XRF % 0.037 0.030 0.013 0.010

Cr2O3 XRF % 0.029 0.019 0.012 0.007

Fe2O3 XRF % 0.151 0.138 0.066 0.050

K2O XRF % 0.0039 0.002 0.001 0.001

LOI % 0.4221 0.235 0.056 0.084

MgO XRF % 0.192 0.157 0.083 0.053

MnO XRF % 0.010 0.005 0.005 0.002

Na2O XRF % 0.066 0.026 0.008 0.010

SiO2 XRF % 0.908 0.397 0.155 0.134

TiO2 XRF % 0.009 0.004 0.006 0.001

SG pyc 0.084 0.078 0.020 0.028

1 S - Std Dev for use on control charts. 2 σL - Betw Lab Std Dev, for use to calculate a measure of accuracy. 3 SW - Within Lab Std Dev, for use to calculate a measure of precision. 4 CSU - Combined Standard Uncertainty, a component for use to calculate the total uncertainty in method validation.

13. Certified values: The Certified, Provisional and Informational values listed on p1 and p2 of this certificate fulfill the AMIS statistical criteria regarding agreement for certification and have been independently validated by Ms Margaret Fairhurst. The Certified values for all NiS, Co, Cu and Ni-XRF and Cr MI/ICP listed on p1 of this certificate fulfill the AMIS statistical criteria regarding agreement for certification and have been independently validated by Mr. Allan Fraser. 14. Metrological Traceability: The values quoted herein are based on the consensus values derived from statistical analysis of the data from an inter laboratory measurement program. Traceability to SI units is via the standards used by the individual laboratories the majority of which are accredited and who have maintained measurement traceability during the analytical process. 15. Certification: AMIS0457 is a new material.



(Reg. No. 1989/000201/07)



T: +27 (0) 11 923-0800

W: www.amis.co.za


16. Period of validity: The certified values are valid for this product, while still sealed in its original packaging, until notification to the contrary. The stability of the material will be subject to continuous testing for the duration of the inventory. Should product stability become an issue, all customers will be notified and notification to that effect will be placed on the www.amis.co.za website. 17. Minimum sample size: The majority of laboratories reporting used a 0.5g sample size for the ICP and a 30g sample size for the fire assay. These are the recommended minimum sample sizes for the use of this material. 18. Availability: This product is available in Laboratory Packs containing 1kg of material and Explorer Packs containing custom weights (from 50 to 250g) of material. The Laboratory Packs are sealed bottles delivered in sealed foil pouches. The Explorer Packs contain material in standard geochem envelopes, nitrogen flushed and vacuum sealed in foil pouches. 19. Recommended use: The data used to characterize this CRM has been scrutinized using outlier treatment techniques. This, together with the number of participating laboratories, should overcome any “inter-laboratory issues” and should lead to a very accurate measure for the given methods, notwithstanding the underlying assumption that what the good inter-laboratory labs reported was accurate. However an amount of bad data might have had an effect, resulting in limits which in some situations might be too broad for the effective monitoring of a single analytical method, laboratory or production process. Users should set their own limits based on their own data quality objectives and control measurements, after determining the performance characteristics of their own particular method, using a minimum of 20 analyses using this CRM. User set limits should normally be within the limits recommended on p1 and 2 of this certificate. 20. Legal Notice: This certificate and the reference material described in it have been prepared with due care and attention. However AMIS, a Division of Torre Analytical Services (Pty) Ltd, Nozibele Mbangula, Melesha Gopi Mungaroo, Margaret M. Fairhurst and Allan Fraser; accept no liability for any decisions or actions taken following the use of the reference material.




(Reg. No. 1989/000201/07)



T: +27 (0) 11 923-0800

W: www.amis.co.za


26 June 2015 Amended 15 February 2016-Recertification of Pt (NiS), Pd (NiS), Rh and certification of Ru (NiS) Amended 25 October 2016-Recertification of NiS, Co, Cu and Ni-XRF and Cr MI/ICP Certifying Officers:

African Mineral Standards:_____________________________________

Nozibele Mbangula

Geochemist:___________________________________________________ Margaret M. Fairhurst, PG, MAusIMM

Oreval

Geochemist:__________________________________________________

Allan W. Fraser M.Sc. (Geology), N.D. (Analytical Chem.), Pr.Sci.Nat.



(Reg. No. 1989/000201/07)



T: +27 (0) 11 923-0800

W: www.amis.co.za


Appendix – uncertified element statistics

Analyte Method Unit Mean 2SD RSD% n

Ag M/ICP ppm 2.5 0.95 18.9 45

Al M/ICP % 1.6 0.11 3.5 53

As M/ICP ppm 6.4 6.8 52.8 24

Au NiS g/t 1.6 0.28 8.9 37

Ba M/ICP ppm 27.3 5.5 10.1 63

Bi M/ICP ppm 3.8 4.2 54.8 30

Ca M/ICP % 1.6 0.16 4.9 62

Cd M/ICP ppm 0.59 0.24 20.0 14

Ce M/ICP ppm 6.6 2.1 16.1 16

Co XRF ppm 453 75.0 8.3 39

Cr M/ICP ppm 9276 4711 25.4 47

Cs M/ICP ppm 0.33 0.09 14.0 15

Cu XRF ppm 8154 2825 17.3 46

Dy M/ICP ppm 0.64 0.06 5.0 8

Er M/ICP ppm 0.45 0.0 0.0 8

Eu M/ICP ppm 0.10 0.0 0.0 8

Fe M/ICP % 9.9 0.8 4.3 61

Ga M/ICP ppm 9.5 15.1 79.2 24

Ge M/ICP ppm 1.0 0.30 14.5 7

Hf M/ICP ppm 0.40 0.04 5.3 22

Ho M/ICP ppm 0.15 0.02 6.8 8

In M/ICP ppm 0.11 0.07 33.6 23

Ir NiS g/t 4.9 0.24 2.4 40

K M/ICP % 0.08 0.01 6.1 58

La M/ICP ppm 2.9 1.3 22.4 48

Li M/ICP ppm 4.6 1.2 13.3 52

Lu M/ICP ppm 0.07 0.02 15.3 8

Mg M/ICP % 13.8 0.82 3.0 61

Mn M/ICP ppm 1084 166 7.7 64

Mo M/ICP ppm 2.1 1.0 24.0 55

Na M/ICP % 0.14 0.01 4.2 60

Nb M/ICP ppm 2.3 0.54 11.7 32

Nd M/ICP ppm 2.7 0.12 2.2 8

Ni P ppm 12026 1406 5.8 24

Ni XRF ppm 14025 5045 18.0 46

P M/ICP ppm 89.0 35.6 20.0 31

Pr M/ICP ppm 0.67 0.07 5.0 8

P2O5 XRF % 0.02 0.02 46.5 23

Rb M/ICP ppm 3.2 0.93 14.4 24

Ru NiS ppm 20.0 0.88 2.2 40

S M/ICP % 2.8 0.48 8.5 63

Sb M/ICP ppm 1.6 0.81 24.7 24

Sc M/ICP ppm 24.2 2.2 4.5 54

Se M/ICP ppm 15.0 7.7 25.4 31

Si M/ICP % 22.0 0.18 0.40 8

Sm M/ICP ppm 0.59 0.05 4.2 7

Sn M/ICP ppm 0.83 0.23 13.7 24

Sr M/ICP ppm 24.4 2.7 5.4 53

Tb M/ICP ppm 0.08 0.0 0.0 7

Te M/ICP ppm 4.6 2.2 24.4 24

Th M/ICP ppm 1.3 0.37 14.1 24

Ti M/ICP % 0.12 0.02 8.1 54

Tl M/ICP ppm 0.34 0.09 13.6 16

U M/ICP ppm 1.3 0.31 11.8 23

V M/ICP ppm 138 26.1 9.5 64

W M/ICP ppm 0.55 0.10 9.3 22

Y M/ICP ppm 3.9 0.44 5.6 45

Yb M/ICP ppm 0.52 0.07 7.2 8

Zn M/ICP ppm 148 32.2 10.9 62

Zr M/ICP ppm 12.7 3.7 14.6 53


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