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COLORADO <br />+ Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />April 2, 2018 <br />Larry Fiske <br />Director of Legacy Site Closure and Reclamation <br />Newmont Mining CO <br />Idarado Mining CO <br />PO Box 584 <br />Ouray, CO 81427 <br />RE: Idarado Mine Complex, Permit # M1977403HR, Mill Level Bulkhead Design and Review <br />Dear Mr. Fiske, <br />The Colorado Division of Reclamation, Mining and Safety (DRMS) would like to thank you for the <br />opportunity to review the planning and design work for the water Flow control bulkhead at the Idarado <br />Mill Level Portal at the Pandora Site. As the design of the bulkhead is entering its final draft for review <br />DBMS has carefully looked at its jurisdictional authority. Based on the accepted Consent Decree and <br />Remedial Action Plan the underground bulkhead is part of the continuing efforts to address water quality <br />and quantities. This is clearly part of the Decree and Plan. <br />The Decree and Plan jurisdiction lies with the Colorado Department of Public Health and Environment <br />(CDPHE). CDPHE has an established relationship for review of such projects with the DRMS Inactive <br />Mines Program (IMP) which ,viii need to be utilized for the actual bulkhead design review and <br />construction. DRMS Mineral Program authority for the active permit is limited to surface disturbance <br />activities and reclamation of those areas. Based on current plan discussions a Technical Revision (TR) to <br />the permit will be necessary to address the upgrades to the portal entrance and any surface water <br />conveyance modification in association with the project. We therefore advise Newmont and Idarado <br />Mining to continue the bulkhead design review and acceptance through the CDPHE process and keep <br />DRMS Minerals informed so that we can assist with a TR for surface modifications when appropriate. <br />Sincerely,, <br />W� <br />Tonylaldron <br />Division of Reclamation, Mining and Safety <br />Minerals Program Director <br />Cc: Doug Jamison, CDPHE <br />Jeff Graves, DRMS IMP <br />Russ Means, DRMS Minerals Grand Junction <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.Co,us <br />John W. Hickenlooper, Governor i Robert Randall, Executive Director I Virginia Brannon, Director <br />