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Ouray Silver Mines, Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 <br /> Ouray, CO 81427 <br /> November 18th, 2021 <br /> Colorado Di%ision of Reclamation Mining and Safet} RECEIVED <br /> 13 l 3 Sherman Street, Rm 21 <br /> Denver, CO 80203 NOV 22 2021 <br /> Subject: Technical Revision 14 (TR-14) Memo: Change Floor SealantC0101'ado Division of Redamatlon, <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 to use VerdeFloor SLX2 as an <br /> alternative to Fastop SL23. The alternative concrete sealant, which is resistant to chemicals and <br /> is expected to provide a suitable seal to the concrete floor, is being procured. As was specified in <br /> TR-14. the condition of the sealant on the concrete floor will be inspected on a regular basis and <br /> new sealant will be applied when necessary. Please see the attached technical data sheet for the <br /> replacement sealant along with email correspondence with the manufacturer stating that <br /> VerdeFloor SLX2 is compatible with the reagent chemicals that are used in the mill without the <br /> need for additional chemical resistant sealant. <br /> Our contractor will continue with equipment placement and the concrete sealant will be applied <br /> once it arrives. Areas where the sealant cannot be applied, such as underneath tanks, will be <br /> sealed using a caulk that has been approved by the Division. <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& Government Affairs <br /> Ouray Silver Mine Inc <br /> Cc: Travis Marshall, DRMS <br /> Amy Yeldell, DRMS <br /> Brian Briggs, OSMI <br /> Phone:(970)325-9830 ♦ Fax:(970)325-9824 <br />