2011-06-20_REVISION - M1990057

• Permit No: M1990057
• IBM Index Class Name: REVISION
• Doc Date: 6/20/2011
• Doc Name: Second copy of TR-03
• From: The Union Milling Company
• To: DRMS
• Type & Sequence: TR3
• Email Name: DMC
• Media Type: D
• Archive: No

Tailing Storage Volume
Phase 1
Phase 2
Phase 3
Total
Total volume (yd
43,000
29,010
72,010
144,020
Freeboard volume (yd
6,790
4,110
4,110
4,110
Net volume (yd
36,210
24,900
67,900
139,910
Net volume (ft
977,670
672,300
1,833,300
3,777,570
Net weight (st)
54,315
37,350
101,850
209,865
Production rate (st/y)
56,000
56,000
56,000
56,000
Cons (11% MP st)
6,160
6,160
6,160
6,160
Cons shipped (wet st)
6,844
6,844
6,844
6,844
Tails (89% MP st)
49,840
49,840
49,840
49,840
Solids ( %)
65%
65%
65%
65%
Water ( %)
35%
35%
35%
35%
Water reclaim ( %)
90%
90%
90%
90%
Net Tails slurry (st)
52,524
52,524
52,524
52,524
Capacity (yr)
1.03
0.71
1.94
4.00
• A 6 -8 inch clay under liner from available onsite selective impermeable soils borrowed
from the tailings disposal area, placed and compacted as one lift with a sheepsfoot roller.
• A seepage /leak detection system between the clay layer and the synthetic liner with the
collection system located in the northwest corner of the impoundment, and the pond
impoundment sloping at 0.5% slope to the northwest.
• A synthetic pond liner of 45 -mil Polypropylene Geomembrane or equivalent.
• Compaction testing during construction.
The TSF facility, as a 110(2) permit, is scheduled for 2 phases of development within the
existing 4.6 acre TSF area. The TSF 4.6 acre area is shown on Exhibit TSF -01 and the TSF is
located within the black line polygon area south of the mill. The Phase 1 TSF is shown on
Exhibit TSF -02 and the Phase 1 facility cross - section is shown on Exhibit TSF -04. The Phase 2
TSF is shown on Exhibit TSF -03 and the Phase 2 facility cross - sections are shown on Exhibit
TSF -04.
The facility is a cut and fill structure, with Phase 1 requiring about 4,500 yd of fill from the
existing TSF OB stockpile east of the existing pond. Table C -13 presents the cut and fill balance
for the Phase 1 and Phase 2 structures. The networking capacity of Phase 1 is 54,000 st and
Phase 2 is 37,000 st. The total pond capacity of Phase 1 is 22.4 ac -ft and Phase 2 is 15.4 ac -ft.
Phase 3 is 4 each 5 ft lifts on the combined Phase 1 & 2 ponds, merging the ponds into one pond.
Final total net working TSF capacity within the 4.6 acres is estimated at 210,000 st tails at 90%
solids. Additional expansion requires increasing the disturbance area beyond the 10 acre 110
permit maximum disturbance and the conversion from a 110(2) permit to a 112 permit.
Table C -13: TSF Impoundment Volumes
Table C- 14:TSF Capacities
M1990 -057 June 6, 2011
Stage 1
Stage 2
Cut (yd
18,000
14,000
Fill (yd
23,000
4,000
Net Excess (yd
-5,000
10,000
• A 6 -8 inch clay under liner from available onsite selective impermeable soils borrowed
from the tailings disposal area, placed and compacted as one lift with a sheepsfoot roller.
• A seepage /leak detection system between the clay layer and the synthetic liner with the
collection system located in the northwest corner of the impoundment, and the pond
impoundment sloping at 0.5% slope to the northwest.
• A synthetic pond liner of 45 -mil Polypropylene Geomembrane or equivalent.
• Compaction testing during construction.
The TSF facility, as a 110(2) permit, is scheduled for 2 phases of development within the
existing 4.6 acre TSF area. The TSF 4.6 acre area is shown on Exhibit TSF -01 and the TSF is
located within the black line polygon area south of the mill. The Phase 1 TSF is shown on
Exhibit TSF -02 and the Phase 1 facility cross - section is shown on Exhibit TSF -04. The Phase 2
TSF is shown on Exhibit TSF -03 and the Phase 2 facility cross - sections are shown on Exhibit
TSF -04.
The facility is a cut and fill structure, with Phase 1 requiring about 4,500 yd of fill from the
existing TSF OB stockpile east of the existing pond. Table C -13 presents the cut and fill balance
for the Phase 1 and Phase 2 structures. The networking capacity of Phase 1 is 54,000 st and
Phase 2 is 37,000 st. The total pond capacity of Phase 1 is 22.4 ac -ft and Phase 2 is 15.4 ac -ft.
Phase 3 is 4 each 5 ft lifts on the combined Phase 1 & 2 ponds, merging the ponds into one pond.
Final total net working TSF capacity within the 4.6 acres is estimated at 210,000 st tails at 90%
solids. Additional expansion requires increasing the disturbance area beyond the 10 acre 110
permit maximum disturbance and the conversion from a 110(2) permit to a 112 permit.
Table C -13: TSF Impoundment Volumes
Table C- 14:TSF Capacities
M1990 -057 June 6, 2011