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Ouray Silver Mines, Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 I <br /> Ouray,CO 81427 <br /> To: Colorado Division of Reclamation,Mining& Safety MAY 12 2021 <br /> 1313 Sherman Street, Rm 215 <br /> Denver, CO 80203 DIVISION OF RECLAMATION <br /> From: Todd Jesse, Environmental Specialist MINING AND SAFETY <br /> Date: May 12,2021 <br /> Subject: PAR Response; Revenue Mine, Technical Revision No. 14 to DRMS 1 12(d)Mining <br /> Permit# M2012-032 <br /> Dear Mr. West <br /> Ouray Silver Mines Inc.(OSMI)received Adequacy Review-1 for Technical Revision 14 to Permit <br /> M2012-032 for the Revenue-Virginius Mine(Mine). The Adequacy Review raised 27 major points,each <br /> of which are addressed in italics under headings that repeat the DRMS point of clarification. For this <br /> response,a number of tables and attachments have been added to provide clarification.A list of tables & <br /> attachments added to this Adequacy Review Response is found below: <br /> Table 4: Reagents <br /> Table 5: Containment Volumes <br /> Table 6: Dosage Rates <br /> Table 7: Phase Schedule <br /> Environmental Protection Map <br /> Excavation Cross-section <br /> SPCC Plan <br /> Emergency Response Plan <br /> SD S Sheets <br /> Supplemental Glycol Ethers Information <br /> Drawing 700-PI-002 <br /> Drawing 100-SS <br /> Contractor QA/QC Manual <br /> Epoxy Information Sheet <br /> 1. Discuss the rational, purpose and evaluation for each chemical presented in Table 1. (why <br /> itis used, need in the system, comparisons to alternatives) - Pursuant to Rule 6.4.21(5) <br /> Please see Table 4. <br /> 2. Chemical storage volumes - Rule 6.4.21(5) <br /> a. State the maximum total quantity of each chemical to be stored on site at any <br /> given time. <br /> Phone:(970)325-9830 ♦ Fax: (970)325-9824 <br />