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T' <br /> RECEIVED <br /> August 2, 2017 <br /> AUG 0 7 2017 <br /> Michael Cunningham DWON OF RECLAMATION <br /> Colorado Division of Reclamation, Mining, and Safety MINING AND SAFETY <br /> 1313 Sherman St. Room 215 <br /> Denver, CO 80203 <br /> RE: Detroit City Mine; DRMS File No. M-2017-003 -Early Waste Rock Sample <br /> Dear Mr. Cunningham <br /> Colorado Calumet Co, Inc. has conducted an early tunnel rock sampling and lab testing as it <br /> continues development of the access tunnel at Detroit City Mine. This sample was taken roughly <br /> C <br /> 60 feet in, with the rock still being within the zone of weathered surface material. The results of <br /> the whole rock analysis and acid-base accounting (ABA) are attached. <br /> As the Division can see, this sample shows acid-base potential at less than -20 t CaCO3/Kton. <br /> Calumet personnel have noted that what appeared to be a small pyrite veinlet was noticed prior <br /> to the blast that generated this material. Currently,the tunnel is being driven towards a location <br /> beneath an old mine access above the current portal, which will be developed as the secondary <br /> escapeway. This is a slight difference from the original tunnel path, and would explain .vhv the <br /> pyrite vein was encountered when it had not been anticipated. Once the secondary escapeway <br /> has been reached, the tunnel direction will change to align with the original mine plan, to reach <br /> C <br /> the ore target area. This path is expected to be pyrite free. <br /> The amount of material generated by the blast that contained pyrite is roughly 20 CY. Therefore, <br /> Colorado Calumet will be haulin,,this material offsite for disposal at an appropriate waste <br /> facility. <br /> The next rock sample will be the blast conducted roughly 100 feet in, and will represent rock that <br /> is the type to be mined for most of the operation's life. It will also be far enough in to not include <br /> weathered rock and surface influences. <br /> Detroit City Mine I <br />