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Ouray Silver Mines,Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 <br /> Ouray,CO 81427 — --�"—' <br /> - ! ILRAY SILIER MI...E <br /> To: Division of Reclamation,Mining,and Safety RECEIVED <br /> From: Brian K.Briggs,P.E.,Chief Executive Officer <br /> Date: July 23,2020 AUG 0 6 2020 <br /> Subject: M20 *Q2 2020 Dissolved Silver Exceedance in GW-3R <br /> DIVISION OF RECLAMATION <br /> Dear Mr. West, MINING&SAFETY <br /> Ouray Silver Mines Inc.(OSMI)is writing to inform DRMS of a dissolved silver exceedance in well <br /> GW-3R during second quarter 2020 sampling. A resample has been scheduled for Tuesday,July 28, <br /> 2020. <br /> The GW-3R sample,collected on June 24,2020,contained 0.0002 mg/L dissolved silver,above the <br /> permitted 0.0001 mg/L. Importantly,the state mandated practical quantification limit(PQL)is 0.0005 <br /> mg/L is well above both the permit limit and the result.Detections below the PQL and the 0.0001 mg/L <br /> method detection limit(MDL)strain the analytical methodology reliability.Results between the MDL <br /> and PQL have error of+/- 100%and should be considered estimates. Because the groundwater dissolved <br /> silver limit is based on non-detect silver(<0.0001mg/L)any detection results in an exceedance of the <br /> existing permit limit. <br /> Since the initial Q2 sampling,the well has been extended to accommodate construction of the passive r <br /> treatment system. The peristaltic pump,a suction-type pump,cannot pull a sample at this deeper depth. 1 <br /> OSMI's third party sampler(PureWater Sytems)will acquire a bladder pump,displacement-type, for next <br /> week's sampling event and future groundwater sampling events. <br /> Sincerely, <br /> Brian K. Briggs PE <br /> CEO,Ouray Silver Mines Inc. <br /> i <br /> Phone: (970) 325-9830 ♦ Fax: (970)325-9824 <br />