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Greg Lewicki And Associates, PLLC <br /> 11541 Warrington Court Phone. (303) 346-5196 Fax(303)-346-6934 <br /> Parker, CO USA 80138 E-Nlail: info(dlewicki.biz <br /> April 13, 2016 RECIWED <br /> Michael Cunningham APR 13 2016 <br /> Colorado Division of Reclamation, Mining, and Safety <br /> 1313 Sherman Street, Rm 215 DIVISION OF RECLAMATION <br /> Denver, CO 80203 MINING AND SAFETY <br /> RE: Detroit City Mine; DRMS File No. P-2016-002; 2111 Notice of Deficiencies Response <br /> On April 13, 2016, Colorado Calumet Co., Inc. received the Division's second notice of <br /> deficiencies for the Notice of Intent to Conduct Prospecting P-2016-002. Responses to each <br /> question posed in the Division's notice are addressed in line below. <br /> 1. In the Division's letter dated March 11, 2016, the Division requested the Applicant specify the <br /> grade of the haul road. Specifically, the Division needs to know the percent grade of the upper <br /> portion of the haul road. This information is necessary to select the appropriate piece of <br /> equipment to haul waste rock back to the portal for backfilling. Please respond. <br /> The upper portion of the haul road has a 6% grade. <br /> 2. The Applicant has stated that none of the waste rock will be used by Park County or otherwise <br /> transported from the site. In addition, the Applicant has stated the adit will be backfilled 40 feet <br /> from the portal. Given the tunnel dimensions (10'x 12), approximately 178 cubic yards of <br /> waste rock will be backfilled into the adit. Please explain what the Operator intends to do with <br /> the remaining 1,822 cubic yards of waste rock. The applicant should speck the amount of <br /> material (in cubic yards) which may be used on the landowner's road and around the portal. It <br /> will be assumed that any remaining material will be backfilled into the adit. <br /> It is anticipated that 1,830 cubic yards of material will be used in creating a more level workspace <br /> around the portal, a larger pad at the lower area near the local road, and provide a crushed rock base <br /> for the access road all the way to the portal. The table below shows the breakdown of volumes for <br /> each task. If the operator ends up running out of rock, they will reduce the size of the pad <br /> constructed at the lower area. <br /> Detroit City Mine Grading Requirements Area Volume Needed <br /> Portal Area 4,422 SF 850 CY <br /> Access Road 51,025 SF 630 CY <br /> Lower Pad 3,392 SF 350 CY <br /> Total 58,839 1 SF 1 1,830 ICY <br />