geochemistry of an experimental waste rock pile, cluff...
TRANSCRIPT
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Geochemistry of an experimental waste rock pile, Cluff Lake, Saskatchewan
Roger Beckie, Leslie Smith, Karin WagnerRoger Beckie, Leslie Smith, Karin Wagner
Frederic GuerinFrederic Guerin
ArevaAreva Mining Mining –– CogemaCogema Resources Inc.Resources Inc.
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OutlineOutline
1.1. Overview of experimentOverview of experiment
2.2. Primary mineralogy Primary mineralogy
3.3. Aqueous phaseAqueous phase
4.4. Secondary mineralogySecondary mineralogy
5.5. Loading estimatesLoading estimates
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Field Site DescriptionField Site Description•• MultiMulti--ring Carswell ring Carswell meteorite impact meteorite impact structurestructure
Waste rock: Waste rock: ––PeterPeter--River aluminous River aluminous
gneissgneiss
––Earl River feldspathic Earl River feldspathic gneissgneiss
––Small amounts of Small amounts of Athabasca sandstoneAthabasca sandstone
Cluff Lake Uranium Mine
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Cluff Lake Mine & Cluff Lake Mine & WasteWaste Rock Rock PilePileCluff Lake
DJ-N
DJ-X
(M.D. Haug, 2001)
1996: mined1996: mined
1998: placed in pile1998: placed in pile
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ConstructedConstructed WasteWaste Rock Rock PilePile ExperimentExperiment
z = 5 m
x, y = 8 m
W E
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Pad and Piping
16 heat-traced outflow pipes
Lysimeter dividers
PVC and HDPE geomembrane
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Top Surface of CPE
123456789101112
13141516
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Instrumentation Hut & Outflow SamplingInstrumentation Hut & Outflow Sampling
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Experimental Program
Pile deconstruction.June 2004
Covered with compacted waste rock.
Aug. 2002
Natural and artificial rainfall, tracers.
Aug. 1999 – Aug. 2002
Wetting up period.Sept. 1998 – Aug. 1999
Construction of pile.1997 – Sept. 1998
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Hydrology
• Average Annual Air Temp: ~0°C (-45 to +35)• Annual Rainfall: 305 mm• Annual Precipitation: 455 mm
Net infiltration(% of precipitation)
Full pile: 56%Individual lysimeters: 30% to 121%
Mean water residence time: ~2.8 years
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Low-Permeability Cover
• August 2002, waste rock with cobbles removed was added to surface of CPE and compacted to create a lower-permeability cover (K ~ 10 -7 m/s)
• Basal discharge reduced by factor ~2.5
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DJX Waste Rock Grain Size Distribution
0
20
40
60
80
100
0.00010.0010.010.11101001000Grain Size [mm]
Perc
ent F
iner
Tha
n
““soilsoil--likelike”” –– matrix flow dominatesmatrix flow dominates
0.25
mm
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GeochemistryGeochemistry•• MineralogyMineralogy
–– Thin sectionsThin sections
–– Whole rock analysisWhole rock analysis
–– XX--rayray
–– SEMSEM
–– LecoLeco Furnace (total S)Furnace (total S)
•• Water chemistryWater chemistry–– Anions with IC (nAnions with IC (n≈≈2500)2500)
–– Cations with ICPCations with ICP--OES (n=272) and ICPOES (n=272) and ICP--MS (n=165)MS (n=165)
–– Electrical conductivityElectrical conductivity
–– Standard water for calibrations (Jayne Standard water for calibrations (Jayne SimserSimser, , National Water Research Institute)National Water Research Institute)
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Primary MineralogyPrimary Mineralogy
•• quartz, kquartz, k--feldspar, albite, chlorite, muscovite, feldspar, albite, chlorite, muscovite, kaolinite, smectite and amphibolekaolinite, smectite and amphibole
•• Sulfide bearing minerals: pyrite and pyrrhotiteSulfide bearing minerals: pyrite and pyrrhotite
•• Sulfide content: 0.45 wt % Sulfide content: 0.45 wt % -- 0.33 wt %0.33 wt %
•• Paste pH ~ 3.6Paste pH ~ 3.6
•• NP/AP ratio ~0.3NP/AP ratio ~0.3
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Aqueous Geochemistry
• Major anion: sulfate
• Concentration range: 600 – 35,000 mg/l
• Maximum: ~ 400,000 mg/l
• High spatial and temporal variability
• General decrease of sulfate concentration in the outflow water during the experiment
• pH 3.2 – 3.6, low variability
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Outflow – Sulfate Concentrations
0
4000
8000
12000
16000
20000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Lysimeter
Sulfa
te c
once
ntra
tion
[mg/
l]
2000200120022003
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Outflow Outflow –– Major CationsMajor Cations
0%
5%
10%
15%
20%
25%
30%
Mg Al Ca Na Ni U Li Mn others
Perc
ent o
f cat
ion
sum
[meq
/l]
60%
K, Co, Sr, Zn, Fe, Ce, Be, Cu, La, Se, Cr and As
200-1500050-5500
300-800
20-800 10-700
5-5501-350
5-200Conc. range [mg/l]
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Results – E.C. vs. Sulfate Concentration
0
5000
10000
15000
20000
25000
30000
35000
0 10 20 30EC [mS/cm]
Sulfa
te [m
g/l]
19992000-20022003
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Sulfate correlation
0.1
1
10
100
1000
10000
100000
100 1000 10000 100000 1000000Sulfate Concentration [mg/L]
Met
al C
once
ntra
tion
[mg/
l]
MgAlNiCoZnCu
h
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0.001
0.01
0.1
1
10
100
1000
10000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
conc
entra
tion
[meq
/l]
Mg Al K Ca Cr Mn Fe Co Ni Cu Zn Sr U
Dilution
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Hydrated magnesium & aluminum sulfates Hydrated magnesium & aluminum sulfates MgSOMgSO44--nHnH22O & KAlO & KAl33(SO(SO44))22(OH)(OH)66
Annabergite NiAnnabergite Ni33(AsO(AsO44))22--8H8H22OO
Brown coating: goethite and ferryhydrite (Brown coating: goethite and ferryhydrite (FeO(OHFeO(OH), Fe), Fe22OO33--0.5H0.5H22O)O)
Yellow coating: jarosite KFeYellow coating: jarosite KFe33(SO(SO44))22(OH)(OH)66
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Scanning Electron Microscopy
50 microns
Hydrated aluminum sulfatesHydrated aluminum sulfates
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Pore water chemistry
0.0
1.0
2.0
3.0
4.0
5.00 1000 2000 3000 4000 5000
cation concentration [mg/l]
dept
h [m
]
0 5000 10000 15000 20000 25000 30000 35000 40000
sulfate concentration [mg/l]
Mg Al Ca Na SO4
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Flow Rates and Outflow Chemistry
Dry conditions
Flow in fine-grained matrix
Relatively slow
Outflow water relatively concentrated
Long time for water-rock interactions
Wet conditions
Flow in coarse grained material
Relatively fast
Outflow water relatively fresh
Short time for water-rock interactions
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Event Effects: Freshening of Outflow
0
10
20
30
40
50
60
70
31-Jul-027-Aug-02
14-Aug-0221-Aug-02
28-Aug-02time
Flow
rate
[l/d
ay]
0
2000
4000
6000
8000
10000
12000
14000
Sulfa
te C
once
ntra
tion
[mg/
l]
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Flow - chemistry
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Flow Rates and Outflow Chemistry
0
5
10
15
20
25
30
Apr-01
Oct-01
Apr-02
Oct-02
Apr-03
Oct-03
flow
rate
[l/d
ay]
0
5000
10000
15000
20000
25000
30000
sulfa
te c
once
ntra
tion
[mg/
l]cover
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Loading at Base of CPE(mg SO4/kg/week)
~0.1163.52002
~0.1113.82001
~0.1195.62000
Winter Low
Summer High
MeanYear Humidity Cells
Hollings et al (2001)
27Coarse 2 mm
66Fine 0.6 mm
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Aerobic leach columns
35 35 –– 40 kg, 3 L rinse per week40 kg, 3 L rinse per week
Percent of initial leached
SUNi
Pore Volumes
34 %
17 %
11 %
79 %
50 %
37 %
N/A~1.25 (2 weeks)Leach Columns
N/A~10 (20 weeks)
5 %~1.25 (5.5 years)Pile Experiment
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DJX Waste Rock Grain Size Distribution
0
20
40
60
80
100
0.00010.0010.010.11101001000Grain Size [mm]
Perc
ent F
iner
Tha
n
Reactive fraction?Reactive fraction?
0.25
mm
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Conclusions• Principal buffer minerals: chlorite and muscovite.
• E.C. good predictor of chemistry.
• Dominant chemistry; relative proportions constant.
• Dilution highly variable in space and time.
• General inverse correlation between outflow chemistry and flow.
• Low permeability cover induced a decrease in flow rates and coincident reduction in outflow concentrations.
• During the 4 year experiment ~ 5 % or 150 kg of sulfur were released.
• U and Ni appear to be dominantly in finer, leachable fraction.
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Acknowledgments
Joe Joe MarcolineMarcoline, John , John JamborJambor, Craig Nichol, , Craig Nichol, Justin Justin StockwellStockwell, Pete Hollings, Pete Hollings