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iii iiiiiiiiiiiii iii 999 STATE OF COLO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman St.. Room 215 Denver, Colorado 80203 Phone: (303) 866-3567 FAX:(303)832~8106 INTERNAL MEMO TO: Byron Walker FROM: Jim Burnell SUBJ: Blue Ribbon Mine Stability Analysis 19 July 2000 DIVISION OF MINERALS GEOLOGY RECLAMATION MINING•SAFETY Bil I Owens Governor GRRE Walchcr Execmrve D~reclor Michael B. Lung Division Director Byron, on-going discussion with Jim Stover of Mirtrec and working through the files, we have come up with this situation regarding Blue Ribbon. 1 will review the situation just to save you the trouble. Blue Ribbon's findings documents indicate they had requested a waiver of the AOC requirement for steep slope mining. A search of their permit reveals a partial stability analysis (determined insufficient by you) but not a complete analysis NOR is there any evidence in the files that any waiver was officially granted. Your analysis of the conditions at the site indicated that a waiver of the AOC requirement was not really needed. However, a stability analysis is needed because of the steep slope conditions. Subsequent discussions with Minrec have revealed that one of the original stipulations in the permit was the completion of "an acceptable stability analysis of the proposed backfilled configuration of all mine facilities." The midterm findings document dated 12 July 1985 indicates that this stipulation has been satisfied, with the stability analysis contained in a stand-alone document titled "Stipulation Respotise Document." Therefore, it appears that all requirements have been satisfied and we are in good condition with regard to the backfilled bench at Blue Ribbon, even though the situation was not described correctly in subsequent findings documents. Thanks for your help.