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To: 'DRMS Den Page 2 of 4 2018-06-06 16:52:41 (GMT) 13032008630 From. Ben Langenfeld <br />Greg Lewicki And Associates, PLIC <br />337_5 West Powers Circle Littleton, CO 80123 <br />June 6, 2018 <br />Michael Cunningham <br />Colorado Division of Reclamation, Mining, and Safety <br />1313 Sherman St, Room 215 <br />Denver, CO 80203 <br />RE: Detroit City Mine; DRMS File No. M-2017-003 - Waste Rock Sample <br />Dear Mr. Cunningham <br />Colorado Calumet Co, Inc. has conducted a tunnel rock sampling and lab testing as it continues <br />development at the Detroit City Mine. This sample was taken roughly 300 feet in. The results of <br />the whole rock analysis and acid-base accounting (ABA) are attached. <br />Please contact me if you have any further questions or concerns. <br />Sincerely, <br />Ben Langenfeld, P.E. <br />Greg Lcxvicki and Associates <br />Detroit City Mine 1 ` -, ullioA_4.x 4._r." <br />