Pulacayo Project Feasibility Study - Apogee Silver

Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report
090644-3-0000-20-IFI-100
18.9.3 TSF Design Criteria
Table 18.2 summarizes the design criteria for the TSF along with the source of each value. This
criteria was developed from industry standards, requirements to meet the plant criteria (such as
operating life and capacity), calculations and modeling of the paste plant, data developed by the
owner’s team, and the design engineers’ recommendations and experience.
Table 18.2: TSF Design Criteria
Item Description Units Value Source
Tailings production
Total t 3,519,000 A
Total to TSF t 1,346,000 A
m 3 1,121,700 D
Nominal Minimum average daily discharge to TSF (Yr 4) t/d 83 A
Maximum average daily discharge to TSF (Yr 12) t/d 986 A
Density (terminal bulk specific gravity, dry wt basis) t/m 3 1.2 D
Water content (total wt basis)
As discharged % 30 - 37 D
Long-term (as retained, average) % 33 C, D
Project life years 12.5 A
Design Rainfall
Average annual rainfall mm Average of record B
Maximum annual rainfall mm Maximum on record B
Peak storm event, diversion works mm 50 - year, 24 - hour B
Peak storm event, impoundments & ponds mm 100 - year, 24 - hour B
Impoundment design (closure) mm 50% of PMP B
Slope stability
Minimum FoS, static (short term) - 1.3 B, C
Minimum FoS, static (long term) - 1.5 B, C
Minimum FoS, pseudo-static - 1 B, C
Design seismic event
Return interval (operating life) years 475 B, C
Design seismic acceleration g 0.20 D
Maximum allowable seismic-induced displacement m 1 B, C
Containment systems
Tailings impoundment -
Geologic & cement -
treated tailings
Emergency pond - Geomembrane B,C
B,D,C
Capping system for TSF - Cement - treated B,C
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