Experience gained Experience gained from the former oreprocessing
and the remediation of the site.
MECSEK-ÖKO Zrt, Pécs, Hungary
Vienna, URAM-2009June 22-26 2009
M. Csıvári, G. Földing, Zs. Berta, G. Németh
PRESENTATION OUTLINE
1 Summary of the remediation works2 Lessons and experience gained from
the former mill process3 Lessons and experience learned from
the remediation
DECREASING OF THE RADIOLOGICAL IMPACT
1 To decrease the radiological impacts to the exceptable level, and long-term stabilization of the radiologically contaminated wastes
This goal is fully achieved•Shafts are backfilled,waste rock piles are landscaped, and covered•Mill and other facilities are demolished or cleaned-up, yards, industrial roads are cleaned-up, heap leaching residues have been relocated, sites have been remediated•Tailings ponds are stabilised, and coveredAltogether the radiological parameters (γ-dose rate, radon exhalation, etc) on the sites ARE IN COMLIENCE WITH all requirements , limits established by the authorities.
1 Summary of the remediation work
GROUNDWATER PROTECTION2 Restoration and protection of the groundwater and surface water
quality from contaminants.This work is being underway in accordance with the original
plansIn this respect:
• Groundwater restoration system and water treatment station have been built: app. 0.5 million m3/a of contaminated water is being extracted in the vicinity of the tailings ponds and treated. App. 44 kt of solute (TDS) has been removed by this way.•Water treatment station was built for the uranium-contaminated mine water and seepage from waste rock piles •In-place uranium treatment columns are in operation in some places•Experimental permeable reactive barrier has been istalled for in situ groundwater treatment
1 Summary of the remediation work
SOME REMEDIATED SITESTP I 2008
TP II 2006
WP 3
HL2
HL1
WP3
Repository for wastes
1 Summary of the remediation work
GROUNDWATER RESTORATION AND WATER TREATMENT STATIONS
Mine water treatment Groundwater restorationMg(OH)2 +gypsumMg(OH)2 +gypsum
TP no.1
TP no.1
Water Treatment Station
•Extraction wells: 27•Horizontal drain: 3.3
km•44 kt TDS has been removed•0.5 million m3 /a is being
extracted
•Extraction wells: 27•Horizontal drain: 3.3
km•44 kt TDS has been removed•0.5 million m3 /a is being
extracted
For the remediation app. 83 million Euro was spentFor long-term monitoring and water treatment app. 2.5 million Euro is needed yearly
1 Summary of the remediation work
2 Experience from the former millingFlow sheet:
Conventional acid leaching (18.5 Mt) and alkaline heap leaching (7.2 Mt) for low-grade ore
1 Radiometric sorting2 Leaching3 Regeneration of the hydrochloric acid used for the eluation
2 Experience gained from the former milling
Chrushing,γ=100%U~700 g/t
Dry screening and sorting
50-75
75-100
100-140
140-200
To the mill, U~0.1%,γ~67% (~41%)
Rad. sorting
Product ~13%
~54%
RADIOMETRIC SORTING OF THE ORE
*in mm
Bogie measuring station
WRPU<100 g/t U=100-230 g/t
Run-off mine ore
~62%
-50*
Reject, (to WP or HL)γ=33%U~84 g/t
Alkaline heap leaching
2 Experience gained from the former milling
ACID LEACHINGThe leaching process was continuously developed because the ore became more and more refractory (branerite)
One stageleachingOne stageleaching
Separate leaching of the sand-fineSeparate leaching of the sand-fine
Stage-wise leaching with dividing the pulp into four portion by hydrociclones and adding the bulk of acidinto the first stage
Free acidFree acid ~5 g/lFor: sandy part~ 60-30 g/l
Fines~10-15 g/lFor: sandy part~ 60-30 g/l
Fines~10-15 g/l 150 12 g/l
Pulp from thickener
~89%~89% ~92%~92% ~94%~94%U recoveryU recovery
Main milestones of the development:
Hydrociklones
Only small part (~12%) of the ore is leached at low free acid concentration
Acid
2 Experience gained from the former milling
R-Cl(from eluation)
Water
~50 g/lH2SO4
R2-SO4
cc.H2SO4
R-HSO4
~20 g/l HCl
2R-Cl + H2SO4 = R2-SO4+2HClRegeneration of the HCl
R-Cl + HSO4- = R-HSO4+HCl
R-HSO4 R2-SO4+H2SO4
Washing1st Column
2nd Column
Spec. consumption: 1.4 kgH2SO4/kg HCl
Decreasing of the chloride consumption by ~2 kg/t
REGENERATION OF THE HYDROCHLORIC ACID FOR ELUATION
2 Experience gained from the former milling
DECREASING OF THE CONSUMPTION OF THE HCl FOR ELUATION
∆~8-2=6 kg/t
Extra: ~2.5-3 kg/t H2SO4
2 Experience gained from the former milling
3 Experience from the remediation
3.1 Mine water treatment3.2 Heap leaching3.3 Groundwater contamination and restoration on TPs area3.4 TPs remediation3.5 Passive/semi-passive methods of water treatment
3 Experience from the remediation
0 4,000,000 8,000,000 12,000,000
1999-08-28
2003-08-27
2007-08-26
2011-08-25
2015-08-24
2019-08-23
2023-08-22
0 200,000 400,000 600,000 800,000 1,000,000 1,200,000volume of cavities [m3]
-800
-600
-400
-200
0
200
400
water
leve
l [mAs
l]
Adit level
Legendwater level (mAsl)volume of cavities (m3)
2016-2018
±0
-700
Sandstone/ClaystoneP-T SandstoneSandstone
Tectonic zoneUranium ore
Legend
Anhydirtemarl/
Siltstoneaquitard
Limestone M Sand and clay
Pl Loose sand (aquifer)2
Northern shaftsSouthern shaftAdit
D
D- drinking water aquifer
Borehole S-11
Water sampling from deep Borehole S-11:
pH~7.5U~5-11 mg/lEl. cond.~5 mS/cm
Water sampling from deep Borehole S-11:
pH~7.5U~5-11 mg/lEl. cond.~5 mS/cm
MINE WATER TREATMENTMINE WATER TREATMENT
I
II-V
3 Experience from the remediation
MINE WATER TREATMENT (cont.)(all uranium-contaminated waters are treated)
Mine water treatment(anion exchange process)
Adit
Seepage from WPs (U~8-20 mg/l)
Seepage from WPs (U~8-20 mg/l)
UO4x2H2O
U~0.3 mg/l1
3542
Mines under floodingMines under flooding
U~4 mg/l
Discharge
2001-2008: 17 t U were removed
~2018
3 Experience from the remediation
HEAP LEACHING RELOCATION OFRESIDUES TO THE FINAL STORAGE
AREA
Wp N3
Site II
Site N1
3 Experience from the remediation
GW CONTAMINATIONON HL-SITES
Contamination was observed first of all nearby the pumping stations
and pipe lines
3 Experience from the remediation
HEAP LEACHING PRACTICEHow to improve the process? Continuously expanding pads need rather large area (in our case 6.5 ha/Mt). Thereforereusable padsseem to be more reasonable with the disposal of the residues on the final storage area.
7.2 million t low grade ore was treated (~140 g/t), ~60% recovery (540tU),
5kg/t Na2CO3 ,37 ha
3 Experience from the remediation
HIDROGEOLOGICAL SITUATION AROUND THE TPs
Geological Profile across the Tailings Pond
W E
TDS contamination
TailingsWater supply area „Tortyogó”
3 Experience from the remediation
GROUNDWATER CONTAMINATIONON THE TPs AREA
577000 577500 578000 578500 579000 579500 580000 58050075000
75500
76000
76500
77000
77500
78000
78500
79000
A-01
B-01
C-01
H/1
U-09/1
U-10/1
U-11/1U-13/1
U-14/1
U-16/1
U-17/1
U-18/1
U-19/1
U-20/1
U-21/1
V-01/1
V-02/1
V-03/1
V-05/1
V-07/1
V-08/1
V-10/1
V-11/1
V-13/1
V-14/1
V-15/1
V-16/1
V-17/1
V-18/1
V-19/1
V-20/1
V-21/1
V-22/1V-23/1
V-24/1
V-25/1
V-26/1
V-27/1
V-28/1
V-29/1
V-30/1
V-32/1
V-33/1
V-35/1
V-36/1
V-37/1
V-38/1
V-39/1
V-41/1
VIII/1
X/1
XIII/1
XVIII/1
XXVII/1
Bicsérd-2/F-5
Pellérd-1/F-5
ZA-1
ZB-1
ZC-1
ZE-1
ZG-1 ZH-1
ZI-1
ZB
ZC
ZD
ZF
ZIZJ R-11
R-12
R-15
R-16
TDS (mg/l) in the shallow groundwater around the tailing ponds in 2003
1000 4000 8000 12000 16000 20000
0 500 1000 1500 2000
577000 577500 578000 578500 579000 579500 580000 58050075000
75500
76000
76500
77000
77500
78000
78500
79000
A-02
B-02
C-02
G
H
U-09
U-10
U-11 U-12 U-13
U-15
U-16
U-17
U-18
U-21
U-22
U-23
V-01
V-03
V-05
V-07
V-09
V-12
V-13
V-14
V-15
V-17
V-21
V-22V-23
V-24
V-25
V-26
V-27V-29
V-34
V-36
V-37
V-38
V-40
VII
XIIIBicsérd-2/F-3
Pellérd-1/F-3
ZA-2
ZB-2
ZC-2
ZD-2
ZE-2
ZF-2
ZG-2
TDS (mg/l) in the deeper groundwater around the tailing ponds in 2003
1000 4000 8000 12000 16000 20000
0 500 1000 1500 2000
5-20 m 25-40 m
TPI
TPII
GW cont. : high TDS (Mg, Na, Ca, SO4, Cl),inadequat neutralization of the barren pulp
TDS~18 g/l
Shallow GW5-20 m
Deeper GW25-40 m
U~ 10 µg/lU~ 60 µg/l
TDS~4 g/l
3 Experience from the remediation
Shallow GW5-20 m
Deeper GW25-40 m
Filtration
Retention basin
Treated mine water (U~0.3 mg/l)
Lime
PRINCIPAL FLOW SHEET OF THE GW TREATMENTOnly shallow
GW and seepage from TPs are treated
Only shallow GW and seepage from TPs are treated
Commom discharge basin
Mg(OH)2 + gypsum
~12 g/l
~6 g/l
4 g/l
3 Experience from the remediation
0.5 million m3/y
REMEDIATION OF THE TPsREMEDIATION OF THE TPs(cover design)(cover design)
TP I.- 1962-1980,1990-1997
- 100 ha- 15 768 kt tailings- 71,3 g/t U- 1 125 t UTP II.- 1981-1989- 59.3 ha- 4 599 kt tailings- 55.8 g/t U- 257 t U
Tailings ponds were dewatered, fine tailings zone stabilised, and than coveredTailings ponds were dewatered, fine
tailings zone stabilised, and than covered
II
Loose loessLoose loess
SandComp. loessClay
~20 mm/y
1.5 m
I
Loose loessLoose loess
Comp. loessProt. layer, comp.loess
Clay
~30 mm/y
1.6 m
3 Experience from the remediation
WATER EROSION OF THE SOIL COVER ON TAILINGS PONDS
Length of slopes:~100 mwithout horizontal steps
Erosion was reduced by making furrow ditchesto divert the water flow
3 Experience from the remediation
STABILIZATION OF THE FINE TAILINGS ZONE
Cooperation with Wismut
and C &E
Special task was the
stabilization of the weak slime
zone
Field test for receiving experience
3 Experience from the remediation
1
2
4
3
0 +8 0 0
0 + 7 0 0
0 + 6 0 0
0 + 5 0 0
0 + 4 00
0 + 3 00
0 + 2 00
0 +0 0 0
0 + 7 0 0
0 + 6 0 0
0 + 5 0 0
0+ 400
0 + 3 0 0
0 + 2 0 0
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1 / 1. v í
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• Fine-tailings zone• Geomaterial (13 ha)
• Drainage trench
Length: 1050 m depth:4-6 md:160 mm Q~ 40 m3/d (~0.076 m3/m2/d)Length: 1050 m depth:4-6 md:160 mm Q~ 40 m3/d (~0.076 m3/m2/d)
DRAIN IN FINE TAILINGS
3 Experience from the remediation
After finishing the covering of tailings pond I., natural background values are expected.
Long term change of effective dose components in the vicinity of taikings
ponds (Pellérd, nearby village)2000 – 2008.
0,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
márc.00
aug.00
jan.01
jún.01
nov.01
ápr.02
szept.02
jan.03
jún.03
nov.03
ápr.04
szept.04
febr.05
júl.05
dec.05
máj.06
okt.06
márc.07
aug.07
jan.08
Idı
Effec
tive d
ose, mS
v/y
Külsı gamma Rn-termék Aeroszol alfa Összes dózis
Terrestiral background Hun. average = 0,8 mSv/y
Population dose limit: nat. background +1 mSv/y
TREND!?
Trend?
2000 2008
Ambient gamma Aerosol alpha Summa dose Rn progeny
1.8
0.9
Effective dose component dropped by ~1 mS/y
IN-PLACE WATER TREATMENT (on WP and former HL)
U-cont.
P1
P2
Seepage from WR (Frici-táró, ~40 m3/d)
Seepage from WR (Frici-táró, ~40 m3/d) HL site N1HL site N1
Passive/semi passive methods of water treatment
EXPERIMENTAL PERMEABLE REACTIVE BARRIER
(for in situ water treatment)course ZVI + sandZVI + sandsandclay
HDPE
Bentofix
aquiferspiezometric head
Design of experimental Permeable Reactive Barrier
GW flow, U~2 mg/l
Installed:August 2002
28 monitoringwells
U<0.1 mg/l
39 t Fe(0)
Fe +sand~1:1PEREBAR- EU-sponsored project
Passive/semi passive methods of water treatment
Test site
LONG-TERM PERFORMANCE OF THE INSTALLED EXPERIMENTAL PRB
Specific electric conductivity, µS/cm
Monitoring
Passive/semi passive methods of water treatment
Ore reserves(left behind on the site)
•Mining and processing of U-ore was terminated in 1997 because of economical reason
•Total estimated solid ore reserve (U~0.12%):•39 Mt (up to –1300 m depth)
•From which mined out solid ore was 20 Mt(28 Mt in form of run-off-mine ore )
•Reserves left behind: 19 Mt 12 Mt (1200-1300 m) 7 Mt (1000-1200 m)
THANK YOU FOR YOURKIND ATTENTION
ND 424L 76X50
Detection efficiency: 5600
imp/s/gU
Decreasing the background and installation more sensitive detectors
DEVELOPMENT OF THE RADIOMETRIC SORTING PROCESS OF THE ORE
2 Experience gained from the former milling
3.4.4 SUBSIDENCE ON THE SLIME ZONE (2001-
2007)Maximum: 1.6 m/7 years,Presently~2 cm/yMaximum: 1.6 m/7 years,Presently~2 cm/y
3 Experience from the remediation
Borehole S-11
Cond (uS/cm) Uranium (ug/l)
Water sampling from deep Borehole S-11:
pH~7.5U~5-11 mg/lEl. cond.~5 mS/cm
Water sampling from deep Borehole S-11:
pH~7.5U~5-11 mg/lEl. cond.~5 mS/cm
0 4,000,000 8,000,000 12,000,000
1999-08-28
2003-08-27
2007-08-26
2011-08-25
2015-08-24
2019-08-23
2023-08-22
0 200,000 400,000 600,000 800,000 1,000,000 1,200,000volume of cavities [m3]
-800
-600
-400
-200
0
200
400
water
leve
l [mAs
l]
Adit level
Legendwater level (mAsl)volume of cavities (m3)
3.1.2 URANIUM CONCENTRATION IN DEEP MINES’ WATER
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0 97 / 37
0 97 / 38
0 97 / 3
90 97 / 4
1
0 9 9 /2 2 L
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0 98 / 2
S z
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S z
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S z0 9 9 / 1 80 9 9 / 1 70 9 9 / 1 6
0 9 9 / 1 5
0 9 9 / 1 40 9 9 / 1 30 9 9 / 1 2
0 9 9 / 1 10 9 9 / 1 0
0 9 9 / 9
0 9 9 / 8
0 9 9 / 6
099/5
S z
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099/25
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0 98 / 3
0 9 7 / 2 2
0 97 / 4
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0 97 / 4
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0 97 / 4
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60 97 / 4
7
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0 97 / 4
00 97 / 4
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0 97 / 43
097/50
0 9 6
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út
089/8
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ú t0 95
0 9 4
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0 7 8 / 1 3
078/12
078/11
Sz
Sz
Sz
089/9 078/9Sz
577500 578000 578500 579000 579500 580000 58050075000
75500
76000
76500
77000
77500
78000
78500
2000
5000
7500
10000
12500
15000
17500
20000
22500
25000
TP no 1.
TP no 1.
mg/l
0 1 6 4 / 1 20 1 6 4 / 1 10 1 6 4 / 1 0
0 1 6 4 / 9
0 1 6 4 / 1 3
0 1 6 4 / 7
0 1 6 4 / 8
0 1 6 4 / 6
0182
0192/1
0 192/ 5
0190
0 1 92/ 6
0 1 91
0 2 20
0 22 1
0222
0 17 4
á rok
ú t
ú t
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0 1 95
Gyep
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0181
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Gyep
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0192/3
0192/4
mocsár
0171/2
0 1 6 3
0 1 6 7
á r o k
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0 1 6 4 / 1 40168
0166
0164/15
0171/1
mocs.
0 1 6 5
á r o k
0 17 0
0 1 7 6
Gyep/l /
0177
E
0178/2
0178/3
0178/4
0 18 8
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üzemi ter.
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E
E
E
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0 1 8 0
0179
0174/30174/2
0173/4
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0173/7a
b
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Gyep(L)
mocs
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0 9 8
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092/2
092/4
092/3
ab
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093/2
0 91
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0 8 7
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0 1 0 8 / 20 1 0 8 / 3
zagytározó0105/11
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057/9
057/10Sz
0 5 7 / 1 30 5 7 / 1 4
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065E
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048/5út
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0 1 0 5/ 4
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042/28
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0 4 2 /1 40 4 2 /1 7
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0 4 2 / 2 2
0 4 2 /2 3
0 42 / 2 4
0 4 2 /2 5
S zS z
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0 4 2 / 3 6
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0 4 2 / 3 70 4 2 / 1 1
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042/33
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0 4 2 / 3 5S zS z
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a
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040/2E
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066/3066/2 zagytározó
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0 1 1 6 / 6
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0 11 6 / 140 1 16 / 7
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01 1 6 / 50 1 1 6 / 4
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0 1 1 6 / 2 60 1 1 6 / 2 7
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01 1 6/2 1
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099/21mocs
0 9 7 / 1 4
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0 9 7 / 1 3
0 9 7 / 1 50 9 7 / 1 7
0 9 7 / 1 6 0 9 7 / 1 8
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0 97 / 49
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S zS z
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0 9 7/ 5 1
0 93
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0 97 / 34
0 97 / 35
0 97 / 36
0 97 / 37
0 97 / 38
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0 9 9 / 2 2 L
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0 98 / 2
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0 97 / 44
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577500 578000 578500 579000 579500 580000 58050075000
75500
76000
76500
77000
77500
78000
78500
TP no 1.
TP no 1.
Shallow GW5-20 m
Deeper GW25-40 m
Shallow GW(TDS) Deeper GW(TDS)
12 (18) g/l
2001
4-5 g/l
23 g/l
3.4 GROUNDWATER CONTAMINATION ON 3.4 GROUNDWATER CONTAMINATION ON TPs AREATPs AREA
Most part of the Mg leached from the ore remained in the tailings waterMost part of the Mg leached from the ore remained in the tailings water
2.4 ESTIMATION OF THE TDS IN TAILINGS WATER
(Balance of acid and neutralizing agents [lime, lime stone grinds, dolomite from the ore] in the mill process)
Tailings water: 32 million m3
~20-22 g/l
Tailings water: 32 million m3
~20-22 g/l
Quantity of TDS seeped into the
groundwater ~400 kt
Quantity of TDS seeped into the
groundwater ~400 kt
CaMg(CO3)2+H2SO4
ΣTDS~546 kt MgSO4+84 kt NaCl~630 kt
pH~7-7.5pH~7-7.5
A Beruházási Program létesítményi sorainak költségeloszlás diagramja 13%
8%
4%
11%
40%
6%
1%
1%
3%9%
5%
Földalatti létesítmények felhagyása Külszíni létesítmények és területek rek.Meddıhányók és környezetük rek. Perkolációs dombok és környezetük rek.Zagytározók és környezetük rek. Bányavíz kezelésVillamos energia hálózat rekonstrukciója Víz- és csatornahálózat rekonstrukciójaEgyéb infrastrukturális szolgáltatás Egyéb tevékenységTartalék az 1998-2003. éves összegre
Planned cost of remediation (1997-2002): 18,5 Billion HUF (74 Million EU)
The distribution of the total cost between the sub-projects
Closing of underground minesReclamation of waste rock pilesReclamation of tailings pondsReconstruction of the electric networkOther infrastructural serviceReserve
Reclam. of surficial facilities and areasReclamation of heap leaching sitesWater treatmentReconstr. of water and sewage systemOther activities (staff etc.)
3.4.1 CONTAMINATION UNDER THE TPs
25 m10 m
577000 577500 578000 578500 579000 579500 580000 58050075000
75500
76000
76500
77000
77500
78000
78500
79000
A-01
B-01
C-01
H/1
U-09/1
U-10/1
U-11/1U-13/1
U-14/1
U-16/1
U-17/1
U-18/1
U-19/1
U-20/1
U-21/1
V-01/1
V-02/1
V-03/1
V-05/1
V-07/1
V-08/1
V-10/1
V-11/1
V-13/1
V-14/1
V-15/1
V-16/1
V-17/1
V-18/1
V-19/1
V-20/1
V-21/1
V-22/1V-23/1
V-24/1
V-25/1
V-26/1
V-27/1
V-28/1
V-29/1
V-30/1
V-32/1
V-33/1
V-35/1
V-36/1
V-37/1
V-38/1
V-39/1
V-41/1
VIII/1
X/1
XIII /1
XVIII /1
XXVII/1
Bicsérd-2/F-5
Pellérd-1/F-5
ZA-1ZB-1
ZC-1
ZE-1
ZG-1 ZH-1
ZI-1
ZB
ZC
ZD
ZF
ZIZJ R-11
R-12
R-15
R-16
1000 4000 8000 12000 16000 20000
0 500 1000 1500 2000
-40-35-30-25-20-15-10-50
0 5000 10000 15000 20000 25000 30000TDS, mg/l
Dept
h, m
U~30 µg/l
2005
Pellérd
P éc se r -B ac h
Wasserbehandlungsbetrieb
I. Schlammteich
II. Schlammteich
SammlerschachtDekontaminierungs BrunneMonitoring BrunneDrainleitungRohrleitungsnetzWasserbehandlungsbetriebTrinkwasser Brunne
GW extraction wells: 27 Deep dranage: 3.2 kmVolume of the extracted Extracted volume of waterin period of (2001-2008) was3.4 million m3, 44 kt of TDS.
3.3.3 GROUNDWATER RESTORATION3.3.3 GROUNDWATER RESTORATION
Water treatment: pump and treat with lime milk.
Sludge : Dry 3-4 kt/a)Yearly operation cost:
800 000 US $ (~1.9 US $/m3)
TP2
TP1
3.1.1 URANIUM IN THE SEEPAGE OF WASTE ROCK
PILES
It can be expected that the uranium attenuation will be slow process
It can be expected that the uranium attenuation will be slow process
Az urántartalom 4 mg/l körüli értékre csökkent 2008-ban
A bányavíz urántartalmának idıben valóváltozása
Perkolációs oldatok esetenkénti bányatérségekbe való leengedése
A perolációs oldatok elısegítették az urán gyorsabb kioldódását a bányatérségbıl
Kivont urán:17 t
REMEDIATION OF THE MILL SITEThe most contaminatedground was found on the ore and acid storagesite, as well as under the yellow cake production facilities.
Scraps of mill balls
Total cost of remediation of the mill site:~ 5 million US $;~0.37 US $/kgU
•Demolition•Clean-up with soil replacing (0.35 Million m3)
Most part of the Mg leached from the ore remained in the tailings waterMost part of the Mg leached from the ore remained in the tailings water
Assasement of the quantity of dissolved compounds disposed on tailings ponds
(Balance of acid and neutralizing agents in the mill process)
Tailings water: 32 million m3
~20-22 g/l
Tailings water: 32 million m3
~20-22 g/l
Quantity of TDS seeped into the
groundwater ~400 kt
Quantity of TDS seeped into the
groundwater ~400 kt
CaMg(CO3)2+H2SO4
ΣTDS~546 kt MgSO4+84 kt NaCl~630 kt
pH~7-7.5pH~7-7.5Na+ K+ Ca2+ Mg2+ Mn2+ SO42- Cl- NO3
- TDS U Ramg/l Bq/l
1.1 0.18 0.60 2.80 0.70 13 2.4 0.18 21 <0.1 5g/l
Estimated composition of the seepage from TPs
PERMEABLE REACTIVE PERMEABLE REACTIVE BARRIERBARRIER
The installation is located in a narrow valley at the foot of WPN3, linking the mining area with drinking wateraquifer
(Zsid-valley)
WP3
GW flowdirection
PRB
Valley
Long-term performance of the PRB in respect of removing of the uranium from groundwater
0200400600800
1000120014001600
13.03.96
11.12.96
18.03.97
22.10.97
14.05.98
04.12.98
30.09.99
25.07.00
11.01.01
07.01.02
07.02.02
28.11.02
15.01.03
27.03.03
22.09.03
12.09.05
28.03.06
12.09.06
Sampling date
U, µg
/l
0200400600800100012001400160018002000
TDS,
mg/l
Hb1/1 UHb1/1 TDSUpstream, U
Construction of the PRB
(August 2002)
LONG-TERM PERFORMANCE OF THE INSTALLED EXPERIMENTAL PRB