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• <br />DEPARTMENT OF NATURAL RESOURCES <br />D Mtlnle Pascoe. Executive Director <br />~ III IIIIIIIIIIIIIIII <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON Director <br />Richartl D. Lamm <br />Governor d ~ ~ Q $ 8 ~ ~ ~ ~ - ~A <br />3 7u~y 19~8'3~ ~ -' <br />TO' Jim Herron ~ \\.H-K7"`--, <br />FROM' Jim Pendleton _ S <br />RE' Sheridan Enterpris~s'Respnnse to Stipulation No. 14, <br />~ Permit No. C-004-BO <br />Pursuant to your request, I have reviewed the submission made by <br />Sheridan Enterprises in response to Stipulation No. 14, placed upon <br />Permit No, C-004-BO for the McClane Canyon mine. <br />The operator's submittal effectively resolves my concerns regarding <br />the cut slope existing southwest of the office trailer at the McClane <br />Canyon mine portal bench. The operator demonstrates that the proposed <br />buttressing of that existing cut slope will improve the static slope <br />stability of the slope. In fact, a static slope safety factor of 1.311 <br />is projected, as compared with the existing slope configuration's, <br />calculated at 1.234. The projected reclaimed configuration's static <br />slope safety factor satisfies the requirements of Rule 4.14.2(1)(b). <br />The operator also states that "the outcrop highwall is in fact a <br />natural rock outcrop and was not a result of excavation." The operator <br />presents only a schematic cross-section on figure 3.1-1, which indicates <br />some sort of partial backfilling of the actual portal face up area. <br />However, the portal highwall has been extensively netted and rock <br />bolted. The operator should provide the Division ulith a detailed <br />description of the specific procedures intended to be implemented in <br />decommissioning and reclaiming the specific portal face up highwall. <br />cc' Brian Munson <br />Doc. No' 4661E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />