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
Table 18.3: Precipitacion (mm)
Month Average Maximum Minimum
% of
Annual
January 78 271.6 3.1 39
February 44.1 149.1 0 22
March 28.1 137 0 14
April 2.1 14.3 0 1
May 1.3 9.6 0 1
June 1.8 39 0 1
July 0.3 13.2 0 0
August 1.9 20.6 0 1
September 2.5 25.4 0 1
October 2.2 36.4 0 1
November 5.7 45 0 3
December 31.7 104.7 0 16
Total 199.8 465.8 33.6 100
Table 18.4: Evaporation (mm) at the TSF
Month Average Maximum Minimum % of Annual
January 163.9 223.5 107.5 10
February 139.4 221.2 104.8 8
March 148 190.6 99.1 9
April 142.1 185.4 103.8 8
May 102 128.7 74.8 6
June 90.8 107.8 83.3 5
July 85.1 104.6 63.8 5
August 111.9 160.8 78.5 7
September 148.5 206.3 90.4 9
October 197.7 221.5 152.6 12
November 185.2 232.8 127.1 11
December 185.2 251.9 130 11
Total 1700 2195.6 1355.2 100
Surface run-off will be diverted away from the TSF by a series of three diversion ditches,
identified as West, East and South. Because the drainage basin is very small (45 ha) and the
peak storm events are small, the size of the ditches and the predicted peak flows are both
modest. The ditches were designed to safely divert up to the 50-year, 24-hour storm. Larger
events will breach the ditches and be contained within the TSF or routed to the emergency pond.
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473
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