MOUNT POLLEY PROJECT
TAILINGS STORAGE FACILITY
MONTHLY WATER BALANCE - AVERAGE PRECIPITATION CONDITIONS
ASSUMPTIONS:
Areas:
Daily Ore Throughput (tpd) =
Solids Content
Tailings S.G. =
Water Content of Ore =
20,813
35%
2.65
2.98%
Open Pits
Bell Pit (Area A) = 17
Diversion Efficiency = 100%
Springer Pit (Area B) = 36
3
Dry Density (t/m ) = 1.4
Mill Site
Millsite Area (Area H) = 59
Diversion Efficiency = 0%
Groundwater Pumping Rate to the TSF
Wight Pit (Area C) = 16
Diversion Efficiency = 100%
Cariboo Pit Area (Area D1) = 31
3
Underdrainage Recovery - Back to TSF (m )= 0
Tailing Storage Facility (TSF)
Total Tailings Facility Area = 235.0
Cariboo Pit acts as a water storage pond
3
Runoff Coefficients:
General
0.35
0.90
0.50
0.24
0.50
0.60
0.70
0.60
0.60
Freshet
1.00
0.90
0.50
0.40
0.50
0.40
1.00
1.00
1.00
0%
(gpm) = 100
Unprepared Area (Area K) = 0.0
3
Unprepared Basin=
Tailings Beach =
Open Pit Area=
Undisturbed RDS Areas =
Millsite Area =
East RDS -Disturbed =
Downstream Tailings Areas =
North RDS - Disturbed =
Northeast RDS - Disturbed =
0%
Bell Pit Groundwater Infiltration (m3/mo) = 16,909
Beach Area (Area J) = 85.0
Initial Volume Bell Pit (m )= 526,062
Rock Disposal Sites (RDS)
East Rock Disposal Site (RDS) - Disturbed (Area E1) =
Diversion Efficiency =
East RDS - Undisturbed (Area E2) =
Diversion Efficiency =
North RDS - Disturbed (Area F1) =
Diversion Efficiency =
North RDS - Undisturbed (Area F2) =
Diversion Efficiency =
Northeast RDS -Disturbed Area (Area G1) =
Diversion Efficiency =
Northeast RDS - Un-Disturbed Area (Area G2) =
Diversion Efficiency =
Low Flow Period
0.20
0.20
0.20
0.00
0.10
0.00
0.20
0.15
0.00
Biosolids Stockpile (Area L) =
Diversion Efficiency =
Downstream Seepage Pond and Area ( Area M) =
Diversion Efficiency =
55
0%
89
0%
15
100%
1
100%
0
100%
0
100%
0%
(gpm) = 0
Wight Pit Groundwater Infiltration (m3/mo) = 76,091
(gpm) = 450
Pond Area (Area I) = 150.0
Initial Volume Cariboo Pit (m3)= 2,032,516
Intitial Volume Wight Pit = 600,781
Groundwater Seepage Loss (m /month) = 5,840
Discharge from TSF (Yes/no) no
If yes, m3/month 0
% to TSF
3
Cariboo Pit Groundwater Infiltration (m /mo) = 0
Diversion Efficiency = 0%
3
Initial Volume (m ) = 568,467
Minimum Desired Volume = 1,000,000
Minimum Fresh Water Makeup = 2.4%
Springer Pit Groundwater Infiltration (m3/mo) = 33,818
4
0%
13
0%
100%
(gpm) = 200
Water Pumped to Other Pits from the TSF
To Wight Pit (m3/year) =
To Cariboo Pit (m3/year) =
To Bell Pit (m3/year) =
Beach Evaporation Factor = 0.50
0
0
0
Water Pumped to the TSF from Cariboo Pit
To TSF (m3/year) =
0
20,523
21,612
17,800
15,500
20,500
22,087
19,500
22,140
21,700
22,500
23,570
22,323
2011
DESCRIPTION
NOV
DEC
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
ANNUAL
94
14.9%
0.0
30.0
17
2.7%
0.0
31.0
100
15.7%
0.0
31.0
31
4.9%
0.0
28.0
20
3.1%
0.0
31.0
10
1.6%
0.0
30.0
92
14.5%
58.0
31.0
80
12.6%
76.0
30.0
104
16.4%
103.4
31.0
40
6.3%
68.7
31.0
23
3.6%
29.0
30.0
24
3.8%
29.3
31.0
635
100%
364
365
0
0
0
0
0
35,000
10,000
0
0
0
0
0
4,000
0
0
0
0
0
0
50,000
0
0
0
0
0
50,000
0
0
0
0
0
50,000
0
0
0
0
0
110,000
0
0
0
0
0
230,000
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
529,000
10,000
25,000
0
17,280
0
5,000
0
10,000
0
50,000
0
110,000
75,000
230,000
0
107,000
0
125,000
0
67,000
0
50,000
0
75,000
0
871,280
75,000
1,143,424
2,000
1,244,234
0
1,024,771
0
806,000
0
1,180,214
10,000
1,230,561
10,000
1,122,643
10,000
1,233,514
10,000
1,249,300
10,000
1,295,357
0
1,313,186
0
1,285,167
0
14,128,372
52,000
374,100
0
72,216
0
2,266
8,590
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
217,050
26,622
0
1,392
4,524
202,050
64,260
0
3,360
10,920
138,000
115,668
0
6,048
19,656
120,000
13,600
0
0
2,080
156,150
17,697
0
0
2,707
60,000
6,800
0
0
1,040
34,500
3,910
0
0
598
35,850
18,284
0
574
2,175
963,600
339,057
0
13,639
52,290
>>> Total
1,298,496
1,265,514
1,079,771
866,000
1,539,802
1,816,151
1,872,015
1,486,194
1,560,854
1,430,197
1,402,194
1,417,049
17,034,238
5,840
207,443
0
0
0
5,840
225,732
0
0
0
5,840
185,916
0
0
0
5,840
146,226
0
0
0
5,840
214,117
0
0
0
5,840
223,251
0
0
0
5,840
203,673
87,000
24,650
0
5,840
223,787
114,000
32,300
0
5,840
226,651
155,100
43,945
0
5,840
235,007
103,050
29,198
0
5,840
238,241
43,500
12,325
0
5,840
233,158
43,950
12,453
0
70,080
2,563,202
546,600
154,870
0
A Precipitation (mm/month)
B % of Annual Precipitation
C Evaporation (mm/month)
Days per Month
3
<WATER INTO TAILINGS IMPOUNDMENT> (m )
Open Pits
Bell Pit (Area 7a)
Bell Pit Groundwater
Springer Pit (Area 11)
Springer to Cariboo
Springer Pit Groundwater
See Row 123
Wight Pit (Area 12)
Wight Pit Groundwater (Pumped)
SEZ (Pumped)
Rock Disposal Sites (RDS)
Long Ditch Flow
Springer RDS
Mill Site
With Slurry
Mill Site (Area 6)
9
17
12
18
13
16
15
1
8
Tailings Storage Facility (TSF)
Tailings Pond Precipitation (Area 1)
Tailings Beach Runoff (Area 2)
Unprepared Area Tailings Facility (Area 3)
Biosolids Stockpile (Area 4)
Downstream Seepage Pond and Area ( Area 9)
2
3
4
5
11
<WATER OUT OF TAILINGS IMPOUNDMENT> (m 3)
20
21
22
23
(-)
(-)
(-)
(-)
(-)
Unrecoverable Water
Seepage Loss/Discharge
Water Retained in Tailings
Evaporation from Supernatant Pond
Evaporation from Beach
Dust Control (water from TSF Ponds)
Total
24
25
213,283
231,572
191,756
152,066
219,957
229,091
321,163
375,927
431,536
373,094
299,906
295,401
3,334,752
1,106,513
-21,300
1,205,655
-171,713
989,823
-101,808
774,670
-60,736
1,142,695
177,150
1,192,209
394,851
1,086,075
464,777
1,195,113
-84,846
1,210,638
-81,320
1,255,933
-198,830
1,273,467
-171,179
1,245,912
-124,263
13,678,703
20,782
0
1,341,096
0
1,608,941
0
1,283,387
0
987,472
0
1,185,502
0
1,026,450
0
942,461
0
1,655,886
0
1,723,494
0
1,827,858
0
1,744,553
0
1,665,575
0
Monthly Water Available (excluding stored water in the TSF)
Available Stored Water in TSF at Beginning of Month
1,085,214
568,467
1,033,942
780,168
888,015
850,374
713,934
990,486
1,319,845
1,171,670
1,587,060
1,409,071
1,550,852
1,883,922
1,110,267
2,443,699
1,129,318
2,488,853
1,057,103
2,537,533
1,102,287
3,000,000
1,121,648
2,858,821
13,699,485
Total Monthly Water Available
1,653,681
1,814,109
1,738,389
1,704,420
2,491,515
2,996,131
3,434,774
3,553,966
3,618,170
3,594,635
4,102,287
3,980,469
1,143,424
18,000
18,911
1,244,234
18,000
20,578
1,024,771
18,000
16,949
806,000
18,000
13,330
1,180,214
18,000
19,520
1,230,561
18,000
20,352
1,122,643
18,000
18,567
1,233,514
18,000
20,401
1,249,300
18,000
20,662
1,295,357
18,000
21,424
1,313,186
18,000
21,719
1,285,167
18,000
21,255
14,128,372
216,000
233,669
1,106,513
1,106,513
1,205,655
1,205,655
989,823
989,823
774,670
774,670
1,142,695
1,142,695
1,192,209
1,192,209
1,086,075
1,086,075
1,195,113
1,195,113
1,210,638
1,210,638
1,255,933
1,255,933
1,273,467
1,273,467
1,245,912
1,245,912
13,678,703
13,678,703
-21,300
-21,300
-171,713
-193,013
-101,808
-294,821
-60,736
-355,557
177,150
-178,406
394,851
216,445
464,777
681,221
-84,846
596,376
-81,320
515,055
-198,830
316,225
-171,179
145,046
-124,263
20,782
20,782
2,032,516
29,264
0
0
43,000
0
233,000
0
233,000
1,871,780
1,871,780
0
0
0
59,182
0
241,920
0
241,920
1,689,042
1,092.43
1,689,042
0
0
0
59,182
0
241,920
0
241,920
1,506,304
1,506,304
0
0
0
53,455
0
241,920
0
241,920
1,317,838
1,317,838
10,788
0
0
59,182
0
60,250
0
60,250
1,327,558
1,327,558
26,040
0
0
57,273
0
80,000
0
80,000
1,330,871
1,330,871
46,872
0
17,980
50,000
0
120,000
25,000
95,000
1,289,763
1,289,763
24,800
0
23,560
50,000
0
140,000
10,000
130,000
1,201,003
1,201,003
32,271
0
32,054
115,000
0
160,000
30,000
130,000
1,156,220
1,084.25
1,156,220
12,400
0
21,297
59,182
0
138,000
50,000
88,000
1,068,505
1,068,505
7,130
0
8,990
57,273
0
45,000
15,000
30,000
1,078,917
1,084.37
1,078,917
7,409
0
9,083
59,182
0
10,000
10,000
0
1,126,425
1,085.16
600,781
7,552
45,000
35,000
618,333
618,333
0
45,000
4,000
659,333
659,333
0
0
50,000
609,333
609,333
0
0
50,000
559,333
859.60
559,333
2,784
0
50,000
512,117
861.88
512,117
6,720
0
110,000
408,837
864.91
408,837
12,096
0
230,000
190,933
190,933
2,560
0
0
193,493
193,493
3,331
0
0
196,824
196,824
1,280
0
0
198,104
198,104
736
0
0
198,840
198,840
1,912
0
0
200,752
38,971
90,000
529,000
526,062
8,024
16,364
0
550,450
550,450
0
16,909
0
567,359
567,359
0
16,909
0
584,268
584,268
0
15,273
0
599,541
599,541
2,958
16,909
0
619,408
619,408
7,140
16,364
0
642,912
642,912
12,852
16,909
0
672,673
672,673
2,720
16,364
0
691,756
691,756
3,539
16,909
0
712,205
712,205
1,360
16,909
0
730,474
730,474
782
16,364
0
747,620
747,620
2,032
16,909
0
766,560
41,407
199,091
0
780,168
850,374
990,486
1,171,670
1,409,071
1,883,922
2,443,699
2,488,853
2,537,533
3,000,000
2,858,821
2,734,557
232,336
232,336
-21,300
211,036
24,776,631
21,429,343
780,168
46,986,141
252,820
485,155
-171,713
81,106
25,029,450
21,655,075
850,374
47,534,899
208,226
693,382
-101,808
106,419
25,237,677
21,840,991
990,486
48,069,154
163,774
857,155
-60,736
103,038
25,401,450
21,987,217
1,171,670
48,560,338
239,811
1,096,967
177,150
416,962
25,641,262
22,201,335
1,409,071
49,251,667
250,042
1,347,008
394,851
644,892
25,891,303
22,424,586
1,883,922
50,199,811
228,113
1,575,122
464,777
692,890
26,119,416
22,628,258
2,443,699
51,191,373
250,642
1,825,763
-84,846
165,796
26,370,058
22,852,046
2,488,853
51,710,956
253,849
2,079,612
-81,320
172,529
26,623,907
23,078,696
2,537,533
52,240,136
263,208
2,342,820
-198,830
64,377
26,887,114
23,313,703
3,000,000
53,200,818
266,830
2,609,650
-171,179
95,651
27,153,945
23,551,944
2,858,821
53,564,710
252,713
2,862,363
-124,263
128,450
27,406,658
23,785,102
2,734,557
53,926,318
954.57
954.83
955.08
955.32
955.64
956.08
956.54
956.78
957.03
957.46
957.63
957.79
955.96
956.22
956.47
956.71
957.03
957.47
957.93
958.17
958.4
958.85
959.02
959.18
Water In or Out of the TSF
(-) Water Recycled to Mill
(+/-) Water Accumulating or Lost
(+) TSF Discharge
>>> Total
26
27
Water Required at Millsite
28 Water for slurry
30 (-) Minimum Fresh Water Input to Mill (from groundwater wells)
31 (-) Water in Ore
Total Required Water Recycle to Mill
Total Water Required
32
33 Water Surplus (Deficit) After Recycle to Process
34 Annual Cumulative Surplus (Deficit)
3
<CARIBOO PIT> (m )
Water Stored in Cariboo Pit at the Beginning of the Month
Cariboo Pit Precipitation (Area 8)
Cariboo Pit Groundwater
Cariboo Pit Evaporation
Water Pumped to the Cariboo Pit from the Springer / and NEZ pit
Water Pumped to Cariboo Pit from the TSF
Water Pumped out of Cariboo for Dust Control and Transfer
Water Pump for Dust Control
Water Pumped from the Cariboo pit to the TSF
40 Water Stored in Cariboo Pit at the End of the Month
35
36
37
38
THIS IS NEW
Available Space below 922m = 6,500,000 m3*0.25 = 1,625,000 m3
<WIGHT PIT> (m3)
Water Stored in Wight Pit at the Beginning of the Month
Wight Pit Runoff
Wight Pit Groundwater
Wight Pit Groundwater (Pumped)
Water Stored in Wight Pit at the End of the Month
803 m to 922 m average 250 gpm ( 45,000 m3/m )
<BELL PIT> (m3)
Water Stored in Bell Pit at the Beginning of the Month
Bell Pit Runoff
Bell Pit Groundwater
Water Pumped to Bell Pit from the TSF
Water Stored in Bell Pit at the End of the Month
<SOUTHEAST PIT>(m3)
41 Water in TSF at End of Month
Volume of Tailings into basin
Cum. Volume of Tailings into basin
Water Surplus (Deficit) After Recycle to Process
Total Water and Solids added to tailings
Cum Volume of Tailings in basin since startup
Volume of Water retained in solids mass
Cum. Supernatant Volume
Total Volume of tailings and Water in basin
Tailings and Water
Plus storm and freeboard
use this
1.82
A1
196,974
0
112,964
721,909
0
613,000
140,000
1,572,010
\
2,734,557
2,862,363
20,782
2,883,146