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Ouray Silver Mines,Inc. <br /> 1900 Main St.Unit 1 <br /> PO Box 564 <br /> Ouray, CO 81427 'AA <br /> C�'JRA"�'" 5/LVEf� 1V11NE <br /> December 16th, 2021 <br /> Mr. Lucas West <br /> Colorado Division of Reclamation Mining and Safety <br /> 1313 Sherman Street, Rm 215 RECEIVED <br /> Denver, CO 80203 <br /> Subject: Technical Revision 15 (TR-15) DEC 22 2021 <br /> Permanent Tailings Placement Colorado Division of Reclamation, <br /> DRMS Permit No. M-2012-032 Mining and Safety <br /> Revenue Mine, Ouray County, Colorado <br /> Dear Mr. West, <br /> Ouray Silver Mines, Inc. (OSMI) is formally requesting permission to begin permanent <br /> placement of tailings in the designated Tailing Storage Facilities (TSFs)at the Revenue Mine <br /> site. This request is being made in accordance with your letter dated July 21, 2021 approving <br /> TR-15 with commitments. The commitments applicable to tailings were to submit baseline <br /> characterization of the tailings using Acid Base Accounting (ABA), Toxicity Characterizations <br /> leachate Procedure (TCLP), and Synthetic Precipitation Leachate Procedure (SPLP). <br /> Results of SPLP, TCLP, and ABA testing on tailings generated by the Revenue Mill are all well <br /> within regulatory limits. A copy of the SPLP, TCLP, and ABA results from ACZ Laboratories in <br /> Steamboat Springs, CO is attached to this request. <br /> OSMI appreciates your attention to this matter. If you have any questions, please contact me at <br /> (970) 325-9830. <br /> Sincerely, <br /> Poppy Staub <br /> VP Environment and Government Affairs <br /> Ouray Silver Mine Inc <br /> Cc: Amy Yeldell, DRMS <br /> Todd Jesse, OSMI <br /> Vie:'f � 25-9830 - ' :(970)32.5 <br />