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Battle Mountain Resource <br />January 31.2000 <br />Page 6 <br />Table 1 Revised Estimates of Pore Volumes in the West Pit <br />Specific Yield <br />(Sy) Total Pore Vol <br />(ft') Unsat. Pore Vol. (ft') Sat. Pore Vol. <br />(ft') <br />0.'~ 20.84 x 106 3.12 x 106 17.72 x 106 <br />TR-26 0.30 28.41 x 106 4.249 x 106 24.16 x l06 <br />Using the revised estimates of saturated pore volume listed in Table 1 with the estimated flow <br />rate out of the West Pit (80 gpnt), the time required to flush 1 pore volume (132,»:1,000 gallons) <br />of the West Pit would be approximately 3.1 ~ years (in contrast to 4 years in TR-261. Combining <br />the revised estimates of pore volumes required to flush the backfill 0.229) with the revised <br />estimate of flushing time per pore volume (3.1~ years) results in a total natural time period to <br />flush the West Pit backYlll of approximately 16 years. A[ a pumping rate of 180 gpm, the time <br />required to pump the necessary volume would be approximately 7 years. <br />3801 Automation Way. Suite l00, Fort Collins, Colorado 8025 <br />Telephone (970) 223-9600 / F.~LY (970) 233-7171 <br />