2019-06-28_REVISION - M1977004 (9)

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Homestake Mining Company May 10,2019 Regular(112d)Operation Reclamation Permit Application Package • The Sericite Stockpile will be removed and placed as cover material, and the footprint of the former stockpile will be scarified and graded to prepare it for seeding. • The Low Point Mitigation located at approximately elevation 10,620 ft. will be graded to drain and avoid ponding water. • Piezometers will be maintained for water level measurement and water quality sampling as long as the Water Management OU is in operation. Additional piezometers may be installed or replaced as necessary as the groundwater monitoring program evolves. Following reclamation of this Water Management OU, piezometers will be plugged and abandoned using standard procedures or retained for future operating use as needed. Well stickups will be removed and surrounding well pads will be reclaimed and revegetated. All materials removed during wellhead abandonment will be properly disposed of. After surface features of the abandoned wells have been removed, the site will be graded to prepare it for seeding. • Extraction and injection wells, water conveyance piping, and equipment used for water recirculation and reagent injection as part of the water quality management systems will be maintained as needed for insitu treatment; for the full duration over which the Water Management OU is in operation. Additional injection/extraction wells may be installed or replaced as necessary during that time, with approval obtained through Technical Revision requests. • On or before reclamation of the Water Management OU, injection/extraction wells will be plugged and abandoned using standard procedures or retained for future operating use. Well stickups will be removed and surrounding well pads will be reclaimed and revegetated. All materials removed during wellhead abandonment will be properly disposed of. After surface features of the abandoned wells have been removed, the site will be graded to prepare it for seeding. Existing roads and drainage features within this operable unit are located on private property and will remain open to accommodate general site access and surface water management. The IRD will be regraded to the final topography shown on Exhibit F Map F-0313, with a section presented on Exhibit F Map F-03C. 5.4. Operable Unit 4: Tie Camp Rock Dump The current topography for the TCRD is shown on Exhibit F Map F-04A. 5.4.1. Previous Reclamation The majority of the TCRD, including existing roads, drainage features, and the low-grade ore stockpile, has been regraded to its final slopes, terraced, and reseeded. A 36" Corrugated Metal Pipe (CMP) has been installed to convey collected stormwater from the top of the TCRD to the bottom to mitigate erosion on the face of the dump slopes. Per the Minerals Program Inspection Report performed on July 25, 2018 (CDRMS, 2018b), the slope below the access road still appears stable and vegetation is well established on the slope. EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 70 HOMESTAKE MINING COMPANY