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March 11, 2016 <br />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 />Bryan Lees <br />Colorado Calumet Co., Inc. <br />P.O. Box 1169 <br />Golden, CO 80402 <br />RE: Detroit City Mine; DRMS File No. P-2016-002; Notice of Deficiencies <br />Dear Mr. Lees, <br />On February 11, 2016, the Division of Reclamation, Mining and Safety (Division) received the <br />Notice of Intent to Conduct Prospecting (NOI) Application for the Detroit City Mine, File No. P- <br />2016-002. Our review indicates the Modification Application contains deficiencies as defined <br />by Rule 5.1.3 of the Mineral Rules and Regulations of the Colorado Mined Land Reclamation <br />Board for Hard Rock, Metal, and Designated Mining Operations. The Division requires the <br />information described below before we can approve the NOI Application. <br />1. Please provide the approximate elevation of the site as required under the General <br />Description section of Form 1 and Form 2. <br />2. The Applicant has stated a 30" culvert will be installed on the access road at a point where it <br />intersects an intermittent drainage. In addition, the Applicant has stated that disturbance <br />associated with the installation of the culvert crossing will be revegetated. Given the short <br />duration of the prospecting season in this area, it is highly unlikely vegetation will be <br />established before the first season of prospecting is complete. Please describe what additional <br />stormwater controls will be used to ensure topsoil and sediment is not washed down the <br />drainage. <br />3. Please specify the depth of material to be placed over the top of the culvert. A minimum of 1' <br />of material should be placed on top of the culvert to ensure that it is not crushed when <br />equipment crosses this portion of the road. <br />4. The Applicant has indicated the access road will be improved through regrading. Please <br />provide additional detail on the improvements to be made to the access road. What is the <br />approximate current grade of the road and what will the final grade be? Will the road be <br />widened as a result of grading? <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 Mike King, Executive Director I Virginia Brannon, Director <br />