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~- " ' J. E. STOVER & ASSOCIATES <br />2768 COMPASS DRIVE, SUITE 101 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245101, FAX 242-7908 <br />MINE ENGINEERING <br />MINE RECUIMATION <br />January 8, 1999 <br />I~~cE~vE~ <br />Joseph J. Dudash <br />Division of Minerals and Geology JAI`S' ~ ~ 1999 <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 - °• ° ' " " "' <br />Re; Bowie Resources Limited -Bowie No. 1 Mine <br />Windy Gap Process <br />TR-029 & TR-030 <br />Permit C-81-038 <br />Dear Mr. Dudash: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />The last time the water depletion from the Bowie No. 1 Mine was evaluated was in 1994 <br />when the mine was anticipating increasing production to 1.5 million tons per year (Ref <br />Volume 9A, Tab, Fish and Wildlife). At that time the operator estimated the following <br />depletion: <br />Item Acre Feet/Year Basis <br />Mine Consumption 28.7 1.5 Million tons/year <br />Surface Consumption 30.9 1.5 Million tons/year <br />Pond Eva oration 4.6 1.47 acres of onds <br />Total Consumption 64.2 <br />Technical revision number 29 is associated with the construction of the east ridge waste <br />disposal area. This action will increase the size of the gob pile sediment pond by 0.16 <br />acres. This translates into an increase in evaporative loss from 4.6 to 5.1 AF/year. <br />Technical revision number 30 provides for the increase in production at the unit train <br />loadout. I propose to prorate the surface consumption from 1.5 to 5 million tons per year. <br />This will allow for the increased consumptive use at the loadout and also allow the Bowie <br />No. 1 Mine to go back into production without going through this process again. <br />Therefore, the estimated depletion associated with the Bowie No. 1 Mine is as follows: <br />