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TRAPPER MiNiNG INC. <br />August ls, 2007 RECEIVED <br />Ms. Janet Binns AUG 2 0 2001 <br />Environmental Protection Specialist <br />Division of Reclamation, <br />Colorado Division of Minerals and Geolo <br />gy Mining and Safety <br />1313 Sherman Street, Room 21 s <br />Denver, CO 80203 <br />Dear Ms. Binns: <br />Re: Trapper Mining_ Inc., .Permit No. C181-0-10, Technical~Revision ~'R-101: <br />Revise Topsoil Stripping Area in East APit-.and Z Pit; Revise Mining Limits in East <br />A Pit, F Pit and Z Pit; Update Post 1Vlining Topograpfiy in F and; Z Pits and tfie Ash <br />Dump <br />Please fmd enclosed duplicate copies of permit revision TR-101. This revision addresses <br />the following issues. <br />Mining limits have been extended in F Pit to accommodate projected pit advance in late <br />2007 and 2008. Topsoil stripping requirements for operations in F pit have been <br />permitted under prior revisions. The revised mining limits aze shown on the enclosed <br />Map M10A (Mining and Regrade), Sheet 2. <br />Mining limits in Z Dip Pit have been extended to accommodate advance in 2008. Recall <br />that modeling and analysis by Agapito Associates Inc. (AAI) indicated that the mine <br />sequence and pit layout for Z Dip Pit was geotechnically stable. DRMS had permitted <br />cuts I-4, but requested further analysis on the azea above G test pit (cuts s-8) including <br />verification of parameters used in the model. Additional coring and geotechnical analysis <br />has been completed and an AAI follow-up report entitled Review of Z-Dip Pit <br />Characteristics Considering Newly Acquired Data (attached) has verified the original <br />assumptions. The extension of mining limits in Z Dip Pit will require additional topsoil <br />stripping (19.33 acres). Mining limits in Z Strike Pit have also been modified to more <br />accurately reflect the timing of development. Revised mining limits aze shown on the <br />enclosed Map M10A (Mining and Regracle), Sheets 2 and 3. Topsoil stripping limits aze <br />shown on the enclosed Map M10B (Topsoil Stripping and Reclaim), Sheet 3. <br />Mining limits in East A pit have been extended as shown on the enclosed Map M10A <br />(Mining and Regrade), Sheet 3. Additional topsoil stripping requirements (6.98 acres) aze <br />shown on Map M10B (Topsoil Stripping and Reclaim), Sheet 3. <br />P.O. Box 187 Craig, Colorado 81626 (970) 824-4401 <br />