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Greg Lewicki And Associates, PLLC <br /> 3375 West Powers Circle Littleton, CO 80123 <br /> July 5, 2019 <br /> Colorado Division of Reclamation, Mining, and Safety <br /> 1313 Sherman St, Room 215 <br /> Denver, CO 80203 <br /> Detroit City Mine; DRMS File No. M-2017-003; Technical Revision <br /> Colorado Calumet Co. is filing a technical revision to modify the shape of the approved permit <br /> boundary. The total permit area is staying unchanged. A portion of the waste rock landform area <br /> is being removed to allow for the addition of ground along the upper portion of the mine road <br /> and the mine portal. Revised maps and the revised diversion ditch design are attached. The <br /> diversion ditch drainage area is slightly larger with this revision. <br /> Maps Documents <br /> C-2 <br /> .. Emil <br /> • <br /> F-1 <br /> Please contact me if you have any further questions or concerns. <br /> Sincerely, <br /> /7- <br /> Ben Langenfeld, P.E. <br /> Greg Lewicki and Associates <br /> Detroit City Mine 1 Grr%I. wki and Associstm N.J.( <br />