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Mr. Dustin Czapla <br /> Page 6 of 7 <br /> Summary <br /> The primary site reclamation efforts for 2019 will consist of rehabilitation of a small <br /> landslide near the South Pit and reconstruction of a lined channel; lining and regrading <br /> the upper diversion ditch in the North Pit; maintenance work on the outlet riser pipe and <br /> outlet valves on the Sediment pond; and removal and restoration of the water treatment <br /> plant and ancillary structures. This work is consistent and integrated with the 2019 <br /> Amended Reclamation Plan. <br /> An integral component to establishing a practical, technically achievable, and sustainable <br /> LPL is the development of alternatives for uranium load reduction at this high elevation <br /> mine site with limited year-round access. Pilot testing and system implementation ongoing <br /> since 2015 was successful at treating uranium in the underground mine workings and <br /> near the toe of the Indian Rock Dump, including desired attenuation of the injected <br /> phosphate. The success of these tests was based on observed uranium removal and <br /> phosphate attenuation within injection zones and immediately downgradient. Achieving <br /> meaningful load reductions in surface water will require further understanding and <br /> quantification of uranium loading to the North Pit Lake, ongoing phosphate injection <br /> system operation and optimizations, and continued expansion of other LPL-based <br /> strategies, such as use of ETCs. Based on this goal, additional LPL activities include the <br /> expansion of the phosphate injection system at the Indian Rock Dump, continued <br /> operation of the phosphate injection systems at the underground mine workings and <br /> Indian Rock Dump (with a surface water treatment residuals management program in <br /> place), and continued operation of the ETCs. Anticipated surface disturbances associated <br /> with these activities are conservatively estimated at approximately 1.1 acres. <br /> If you have any questions or require further information regarding this submittal, please <br /> contact me at (505) 252-96 <br /> >aveWlykoff, <br /> on be I ,of <br /> Clark Burton <br /> Homestake Mining Company <br /> Head of Operations, Asset Development <br /> CC: Walter Baumann—Homestake Mining Company, Project Evaluation Manager <br /> Dave Wykoff—Homestake Mining Company, Site Manager <br /> Mike Hay—Arcadis, U.S., Inc. <br /> References <br /> Arcadis. 2016. Draft Alternatives Analysis and Lowest Practical Level Update. Prepared <br /> for Homestake Mining Company. December. <br /> HOMESTAKE MINING COMPANY 4 1 1 2 MARSHALL STREET, SARGENTS, COLORADO 8 1 248 <br />