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Ouray Silver Mines, Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 <br /> Ouray,CO 81427 <br /> To: Colorado Division of Reclamation Mining &Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> From: Poppy Staub, VP Environmental & Government Affairs Ve <br /> Date: July 18, 2022 <br /> Subject: Quarterly Hydrology Report <br /> Q2 2022 Groundwater Results <br /> DRMS Permit No. M-2012-032 <br /> Cc: T Jesse, Environmental Specialist, OSMI <br /> Ouray Silver Mines performed second quarter 2022 groundwater sampling on May 25th, 2022 at <br /> the Revenue Mine under DRMS permit M-2012-032. The samples were analyzed by ACZ <br /> Laboratories in Steamboat Springs, CO. Samples were received by the lab within holding times <br /> and within the appropriate temperature when received by the laboratory. <br /> Results were within historical levels and below the groundwater standards approved in our <br /> permit(see attached summary page for Q2 2022 data). Note,total cyanide was detected in <br /> GW-1A and GW-2A, which is suspect as OSMI does not sue cyanide in its process. The <br /> laboratory investigated its practices and reported that the cyanide detections were a laboratory <br /> error due to sample contamination during sample prep.The samples were re-run by the lab and <br /> results were below detection limits. We have had issues with cyanide in other samples run by <br /> ACZ and are working with the lab to remedy the issue. <br /> Copies of laboratory sheets and field forms from the Q2 2022 sampling event are attached. <br /> Phone:(970)325-9830 ♦ Fax:(970)325-9824 <br />