2021-05-12_REVISION - M2012032 (2)

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Ouray Silver Mines, Inc. 1900 Main St. Unit 1 PO x 564 Ouray, CO 81427 _�_., _.... LkIRAY -51LVER rI111%'E To: Colorado Division of Reclamation, Mining& Safety 1313 Sherman Street, Rm 215 Denver,CO 80203 From: Brian K. Briggs, P.E.,Chief Executive Officer Date: May 12,2021 ,�CEIVED Subject: PAR Response; Revenue Mine, Technical Revision No. 12 to DRMS 112(d)Mi Permit#M2012-032 MAY 12 2021 Dear Mr. West, DIVISION OF RECLAMATION MINING AND SAFETY Ouray Silver Mines Inc.(OSMI)received the preliminary adequacy review(PAR)regarding the application for Technical Revision 12 to Permit M2012-032 for the Revenue Mine(also known as the Revenue-Virginius Mine). OSMI requested and received,an additional 45 days to prepare this response. As presented in the TR12 request,organic material was noted in GW-4 during the development of the well. Initially this material was thought to be a small amount of drilling-related fluid from the drill rig. However repeated attempts to clean the well were not effective, leading OSMI to both contact DRMS and to question the drill rig as a source.Archeological reports,provided under confidential cover in the TR12 request revealed a historic machine shop in the vicinity of the well as a likely source. Given the lack of regulated constituents associated with the organics in GW-4 and the lack of sheen expression in surface water,OSMI proposes to plug and abandon GW-4 and cease visually contingent monitoring at SW-22. With respect to GW-4R, OSMI withdraws the proposal for GW-4R. Pond 3 effluent is heavily sampled under Colorado Discharge Permit System industrial wastewater discharge permit no.CO0000003,therefore water quality will be well known and should be high quality as it is the final polishing step prior to discharge. OSMI proposes that Pond 3 is best monitored at Outfall 002A as required under Colorado Discharge Permit CO0000003, in lieu of a groundwater well. OSMI's response to the 13 items in the preliminary adequacy review are presented below, with supporting information attached as follows: Attachment 1: Environmental Sampling Map Attachment 2: Table 2. GW-4 and SW-22 Sampling Results Update Attachment 3: Laboratory Reports for GW-4 and SW-22 Attachment 4: Field Notes for GW-4 and SW-22 Sampling Attachment 5: Geosyntec GW-4 Analytical Recommendations 1) Throughout the revision materials submitted, Table 2 is referenced however Table 2 was not included in the TR package. Please provide Table 2- GW-4 and SW-22 Sample Results. Table 2,missing in the original revision request,was provided in the extension request. However,all data (including new data)related to organic sampling at GW-4 and SW-22(see map,Attachment 1) is presented in the attached Table 2 Update(Attachment 2). All related laboratory reports are in Attachment 3 with field notes in Attachment 4. Phone: (970)325-9830 ♦ Fax: (970)325-9824