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Ouray Silver Mines Inc. <br /> Technical Revision 11 March 26, 2020 <br /> 2.3 New Waste Storage Pad and Enclosure with Secondary Containment <br /> OMI requests approval to include a Waste Storage Pad and Enclosure(with secondary <br /> containment)that was constructed in 2018 in the list of structures as well as in the updated <br /> Reclamation Plan. <br /> The Waste Storage Pad is constructed of two shipping containers that have been enclosed with <br /> corrugated metal that provides a shelter over the pad. The dimensions of the enclosure are 30 feet <br /> wide by 20 feet long. The Pad, which does not underlie the connex components of the enclosure, <br /> is 18 feet wide by 20 feet long. The enclosure is located just outside the Mill Filter Building and <br /> contains used oil drums on spill pallets and a double-walled,200-gallon mobile diesel fuel tank. <br /> The used oil drums were previously stored underground. The mobile diesel tank, used to fill <br /> difficult to maneuver equipment,previously lacked appropriate winter storage. The Waste <br /> Storage Pad and Enclosure are inspected monthly as SPCC item C-4 waste storage pad and <br /> submitted in Annual reports. Signage indicates the type of materials present, and a fire <br /> extinguisher is kept within the structure. <br /> Initially this enclosure was to be temporary. However, a DRMS Inspection conducted on June 5, <br /> 2019 identified the structure as a permanent feature and DRMS requested that it be permitted <br /> through a formal TR. The pad and enclosure are included in the list of structures as part of the <br /> updated Reclamation Plan and is located on the revised Reclamation Plan Map (Table L-2 and <br /> Map F-1). <br /> 3 RECLAMATION PLAN UPDATE <br /> OSMI requests approval to make minor updates to the Reclamation Plan and Reclamation Plan <br /> Maps F-1 and F-la. <br /> The items discussed in Sections 2.2 and 2.3 above require updates to the Reclamation Plan and <br /> Reclamation Plan Maps. In addition,the Reclamation Plan and Maps require updating to reflect <br /> changes to surface disturbance associated with implementation of the full-scale passive mine <br /> water treatment system permitted with TR-10. <br /> 3.1 Passive Treatment Materials Placement <br /> The treatment media that will be removed from the pilot scale passive mine water treatment <br /> system will be temporarily placed alongside the top soil storage area until used as a soil <br /> amendment to reclaim the side slopes of the passive water treatment ponds or used within the <br /> SRB reactor as treatment media. Section 3.5 of the Reclamation Plan has been modified to <br /> include this feature and temporary storage area. <br /> 3.2 Waste Storage Pad and Enclosure <br /> The Waste Storage Pad and Enclosure has been added to the Reclamation Plan Map-F1 a and in <br /> Table L-2, list of structures. <br /> Page 7 of 8 <br />