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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department: of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 Interoffice Memo <br />To: Jim Stark <br />From: Kent Gorha <br />CC: Sandy Brown <br />Date:: May 16, 2011 <br />RE: Adequacy review #4, TR-81, Colowyo Mine, C-81-019 <br />COLORADO <br />D I V1 S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />have completed my review of the materials received from Colowyo on April 26, 2011 <br />addressing the Divisions third adequacy letter for Technical Revision No. 81 (TR-81) for the <br />Colowyo Mine, #C-81-019. My comments are ordered as per the question numbers of that <br />letter. Any remaining concerns are highlighted in bold for the specific question. <br />12. Response accepted. <br />35. Response remains unacceptable with the following exceptions: Any issue with <br />tributary D is now resolved. <br />o Tributary ditch B empties onto the undisturbed area on the side of a ridge and <br />was not present in the pre-mining topography. <br />o Tributary E empties into no apparent existing channel and appears to be <br />unnecessary as no drainage was present in the pre-mining topography. <br />o Tributary G appears to be mis-aligned based on the post-mining topography <br />and/or may need an additional branch to the west. <br />o Tributary H appears mis-aligned to the east due to the flat 7900 foot contour <br />bench. <br />Please review and make corrections as necessary to the above tributary ditches. <br />This concludes my review. If you have questions, let me know. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction Durango Active and Inactive Mines