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<br />J. E. STOVER & ASSOCIATES <br />2768 COMPASS DRIVE, SUITE 101 <br />GRAND NNCTION, COLORADO 81506 <br />PHONE: (970) 245J101, FAX 212-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />August 16, 1999 <br />J. J. Dudash <br />Division of Minerals & Geology <br />1313 Sherman St., Room 2l5 <br />Denier, CO 80203 <br />Re: Bowie No. 2 Mine <br />Gob Pile Stability -Vent Shaft Spoil <br />Permit C-96-083 <br />Dear Mr. Dudash: <br />II~I~II~I'~III"Itl' <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />RECEIVED <br />AU6 181999 <br />Division of Minerals 8 Geology <br />Enclosed is a letter report from Lambert and Associates which addresses the stability of the gob <br />pile. The report calculates the effect a layer of spoil material from the ventilation shaft will have <br />on the stability of the gob pile. Based on the results of tfie report, no special procedures are <br />required to place and compact the vent shaft spoil in the gob pile to maintain a factor of safety <br />greater than I.S. No effort will be made to mix the vent shaft spoil with the underground gob <br />material. <br />Please call if you have any questions. <br />Sincerely, <br />~f~j~ <br />J. E. Stover, P.E. <br />Consulting Engineer <br />cc: Wm. A. Bear, Jr. <br />