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Ouray Silver Mines, Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 <br /> Ouray, CO 81427 <br /> C]LIRAY SILtlER MI+VF <br /> To: Colorado Division of Reclamation,Mining, & Safety <br /> 1313 Sherman St. Rm. 215 <br /> Denver, CO 80203 <br /> July 9, 2021 <br /> Dear Mr. West <br /> Ouray Silver Mines Inc. (OSMI)received the Preliminary Adequacy Review for Technical Revision 15 to <br /> Permit M2012-032 for the Revenue-Virginius Mine(Mine). The Adequacy Review raised 38 major <br /> points, each of which are addressed in italics under headings that repeat the DRMS point of clarification. <br /> A list of tables and attachments added to this Adequacy Review Response is found below: <br /> Figure 2.Image of Zn Rougher Scavenger Flotation Cells. <br /> Table 1. Updated list of major tanks found in the mill area <br /> Table 7. Complete list of tanks and equipment in mill area <br /> Table 8. Day Tanks <br /> Table 9. Sumps RECEIVE® <br /> Table 10. Containment Volumes <br /> Humboldt EZ Nuclear Gauge Data Sheet <br /> Updated 800-PI-003 JUL 142021 <br /> Updated 800-MF-003 <br /> P&ID Drawings DIVISION OF RECLAMATION <br /> Slurry Tank Drawings MINING AND SAFETY <br /> SRK Consulting Tailings Design <br /> CTL Thompson Tailings Design <br /> Metallurgical Study <br /> 2015 Revenue Mine: Mill Certification <br /> 1. Will any improvements to County Road 26 be necessary for hauling to the Atlas Tailing Storage <br /> Facility (Atlas TSF)? Does OSMI have permission from Ouray County to use County Road 26 <br /> to access the Atlas TSF? <br /> Response: Ouray County is responsible for County Road 361 and 26a. The mine and the county have <br /> entered into a road maintenance agreement that allows the mine to close 361 at Senator Gulch and <br /> conduct avalanche forecasting/mitigations during winter months. The agreement also allows the mine <br /> to maintain the road from Hwy 550 to the end of 26a year-round at the mine's discretion. <br /> 2. While the Tailings storage facility designs are understood to be revised and the adequacy of those <br /> designs are not part of this review, please include copies of the design specifications of both <br /> the Revenue and Atlas Tailings storage facilities as approved to provide a holistic view of the <br /> milling process through tailings handling. <br /> a. How is the compaction requirement of 94%for the TSF being verified in the field? <br /> Response:Please see the attached TSF designs. <br /> Phone: (970)325-9830 ♦ Fax: (970) 325-9824 <br />