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The TSF facility, as a 110(2) permit, is scheduled for 2 phases of development within the existing 4.6 acre
<br />TSF area. The TSF 4.6 acre area is shown on Exhibit TSF -01 and the TSF is located within the black line
<br />polygon area south of the mill. The Phase 1 TSF is shown on Exhibit TSF -02 and the Phase 1 facility
<br />cross - section is shown on Exhibit TSF -04. The Phase 2 TSF is shown on Exhibit TSF -03 and the Phase 2
<br />facility cross - sections are shown on Exhibit TSF -04.
<br />The facility is a cut and fill structure, with Phase 1 requiring about 4,500 yd of fill from the existing TSF
<br />OB stockpile east of the existing pond. The 4,500 yd is the excess cut material stockpiled from the
<br />original TSF construction. This material is incorporated into the cut and fill balance for the new TSF
<br />construction. Table C -13 presents the cut and fill balance for the Phase 1 and Phase 2 structures. The net
<br />working capacity of Phase 1 is 54,000 st and Phase 2 is 37,000 st. The total pond capacity of Phase 1 is
<br />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,
<br />merging the ponds into one pond. Final total net working TSF capacity within the 4.6 acres is estimated
<br />at 210,000 st tails at 90% solids. Additional expansion requires increasing the disturbance area beyond
<br />the 10 acre 110 permit maximum disturbance and the conversion from a 110(2) permit to a 112 permit.
<br />Table C -13: TSF Impoundment Volumes
<br />Table C- 14:TSF Capacities
<br />Tailing Storage Volume
<br />Stage 1
<br />Stage 2
<br />Cut (yd)
<br />18,000
<br />14,000
<br />Fill (yd 3)
<br />23,000
<br />4,000
<br />Net Excess (yd 3)
<br />-5,000
<br />10,000
<br />Table C- 14:TSF Capacities
<br />Tailing Storage Volume
<br />Phase 1
<br />Phase 2
<br />Phase 3
<br />Total
<br />Total volume (yd)
<br />43,000
<br />29,010
<br />72,010
<br />144,020
<br />Freeboard volume (yd 3)
<br />6,790
<br />4,110
<br />4,110
<br />4,110
<br />Net volume (yd 3)
<br />36,210
<br />24,900
<br />67,900
<br />139,910
<br />Net volume (ft)
<br />977,670
<br />672,300
<br />1,833,300
<br />3,777,570
<br />Net weight (st)
<br />54,315
<br />37,350
<br />101,850
<br />209,865
<br />Production rate (st/y)
<br />56,000
<br />56,000
<br />56,000
<br />56,000
<br />Cons (11 % MP st)
<br />6,160
<br />6,160
<br />6,160
<br />6,160
<br />Cons shipped (wet st)
<br />6,844
<br />6,844
<br />6,844
<br />6,844
<br />Tails (89% MP st)
<br />49,840
<br />49,840
<br />49,840
<br />49,840
<br />Solids ( %)
<br />65 %n
<br />65%
<br />65%
<br />65%
<br />Water ( %)
<br />35%
<br />35%
<br />35 %n
<br />35%
<br />Water reclaim ( %)
<br />90%
<br />90%
<br />90%
<br />90%
<br />Net Tails slurry (st)
<br />52,524
<br />52,524
<br />52,524
<br />52,524
<br />Capacity (r)
<br />1.03
<br />0.71
<br />1.94
<br />4.00
<br />TSF Construction Preparation
<br />Construction of the Phase 1 TSF impoundment requires the removal and replacement of approximately
<br />1,000 st of historic tailings and approximately 100 st of magnetite, both currently contained within the
<br />unlined facility. The TSF OB stockpile to the east of the existing impoundment will also be removed,
<br />incorporated into the fill construction of the lower access road to the concentrate storage and fill for the
<br />Phase 1 impoundment.
<br />M1990 -057 May 14, 2013
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