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• p0 <br />J <br />Adrian <br />4 December 2008 <br />Timm Comer, Environmental Manager <br />Cripple Creek and Victor Gold Mining Company <br />Victor, Colorado 80860 <br />RE: Mine Life Extension Permit: <br />Modification of Backfill Plan for Schist Island Mine <br />Dear Timm, <br />Scope <br />Cripple Creek and Victor Gold Mining Company (CCBV) propose to modify the method <br />of backfilling of the Schist Island Mine in the Mine Life Extension Permit. The proposed <br />modifications are set out in the following Drawings, which are attached to this letter. <br />Drawing 1: Topography at the end of overburden placement in the vicinity of the Schist <br />Island Mine as presented in the MLE Application [from Drawing C-5 Mining Sequence <br />• (year 2016)] <br />Drawing 2: Proposed revised topography at the end of overburden placement in the <br />vicinity of the Schist Island Mine. <br />Drawing 3: Cross section at closure placement through Schist Island Mine and Globe <br />Hill Mine as presented in the MLE Application (from Drawing C-6 Mining Cross-Section). <br />Drawing 4: Proposed revised cross section at closure through Schist Island Mine and <br />Globe Hill Mine. <br />Drawing 5: Topography at closure in the vicinity of the Schist Island Mine as as <br />presented in the MLE Application (Drawing F-1: Approximate Post Mining Topography). <br />Drawing 6: Proposed revised topography at closure in the vicinity of the Schist Island <br />Mine. <br />Evaluation <br />I have reveiwed the changes that are proposed as requested, and have revised my <br />evaluation of the potential for flow from the Globe Hill Mine through the Schist Island <br />Mine to the project boundary. The revised evaluation is presented as Attachment 1 to <br />this letter. <br />is <br />Based on this re-evaluation, I hereby certify that the conclusions in my evaluation are <br />unchanged by the proposed modification to the backfilling of the Schist Island Mine: <br />• Any water that enters the groundwater regime in the footprint of the Schist Island <br />Mine will pass vertically through the diatreme, will be neutralized by calcite in the <br />`Innovative Environmental Solutions" <br />130 W. 4IA Avenue <br />Denver, Colorado 80223 <br />303.698.9080 Fax 303.698.9241 <br />www.abcb2o.com