2021-06-24_REVISION - M2012032 - Laserfiche WebLink

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Ouray Silver Mines, Inc. 1900 Main St. Unit 1 PO Box 564 Ouray,CO 81427 `RAY S1LL'FR M1JIl To: Colorado Division of Reclamation, Mining, & Safety 1313 Sherman St. Rm. 215 Denver, CO 80203 June 22, 2021 Dear Mr. West Ouray Silver Mines Inc. (OSMI) received Adequacy Review-3 for Technical Revision 14 to Permit M2012-032 for the Revenue-Virginius Mine(Mine). The Adequacy Review raised 21 major points, each of which are addressed in italics under headings that repeat the DRMS point of clarification. A list of tables and attachments added to this Adequacy Review Response is found below: Updated Table 1. Volume of Reagents Updated Table 4. Reagent Information Updated Table 5. Containment Volumes Updated Table 6. Dosing Rates Updated Table 7. Pipe Drain Volumes Updated Table 8. Reagents in Tailings Table 9. Reagent Venders ASME B31 Standard AWS D1.1 Standard 1. The Division is amenable to allowing alternative chemicals so long as they are comparable. The Division will allow up to two alternatives (three total chemicals to be used interchangeably). If in the future, a different chemical type or comparable alternative is needed, a Technical Revision shall first be submitted and approved prior to switching. Response: Comment is acknowledged. However, if the Division is agreeable, we would propose using the quarterly mill report identified in Comment 10 to update the chemical list. 2. Attached is the Division's table 1 summarizing the chemicals proposed to date. If the manufacturer name is in red,the MSDS has not been provided to the Division, please see question XXXX. In the case where more than 3 alternatives have been provided please indicate which manufacturer will be your second and third choices. Similarly other manufacturers were proposed in early submissions but not mentioned in Adequacy Response#2 Table 4. Update/complete this table. Response:At this time, the mine will start the mill with the chemicals listed in the attached Table 9 which is an update to the Division's table 1. All tables that contain information regarding reagents have been updated to the list found in Table 9. 3. Several new chemicals have been proposed within Adequacy Response #2. MSDS' need to be provided for any and all chemicals in which OSMI proposes to house within the reagent room. a. Update tables accordingly. Include new/alternatives throughout all documents. b. Once MSDS for primary and alternatives are received, the Division will verify that the proposed alternatives are comparable and have similar environmental and health risks. Phone: (970)325-9830 ♦ Fax: (970)325-9824