2019-06-28_REVISION - M1977004 (9)

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Homestake Mining Company May 10,2019 Regular(112d)Operation Reclamation Permit Application Package 6.0 AMENDED RECLAMATION PLAN SCHEDULE 6.1. Reclamation Activities Based on the reclamation activities discussed in the previous sections, a reclamation schedule has been developed that generally includes the North Pit, South Pit, IRD, TCRD, Sandstone and Limestone Quarries. The schedule is summarized below as follows: • 2019 activities include the North Pit East Diversion Channel; and South Pit Landslide Slope Mitigation and East Diversion Channel reclamation. • 2020 activities include the North Pit Landslide Crest Mitigation; South Pit Landslide Crest Mitigation; Sandstone Quarry; Limestone Quarry; and Shop Building, Fuel Storage are Equipment reclamation. 2023 activities include the North Pit Northwest Pit Wall Layback, Partial Pit Backfill, French Drain and Southeast Pit Wall Buttress; IRD Sericite Stockpile and low Point Mitigation; TCRD Disposal Cell reclamation. • 2024 activities include the haul and access road reclamation. Prior to commencing any of the reclamation activities noted in the amended reclamation plan, HMC will obtain approval from CDRMS. 6.2. Ongoing Reclamation Monitoring The following monitoring have historically been performed as part of the ongoing site management and will be continued in the near-term (next five years) as part of the reclamation: 1. Groundwater monitoring will continue as necessary using existing piezometers. A history of the phreatic surface is needed to demonstrate the stability of the rock dumps. Groundwater quality monitoring will be continued into the future to the extent that it informs the conceptual model of uranium loading to surface water and in monitoring the performance of uranium load reduction systems. In areas where water quality monitoring is not deemed necessary for these purposes, groundwater monitoring will be reduced or eliminated. 2. Surface water monitoring will continue at SW-33, as long as is required by WQCD. 3. Slope movement monitoring will continue on an annual basis, including conventional survey and inclinometers. HMC may discuss potentially adding an Interferometric synthetic aperture radar (InSAR) survey to supplement or replace the current slope movement monitoring program. In addition, the following programs will continue: 1. Discussions with WQCD for defining water quality standards and LPLs, in order to facilitate the development of a Final Reclamation Plan. 2. Phosphate injection program and testing of field-scale ETCs and request Technical Revisions from CDRMS as needed for program needs. 3. Remedial Earthwork for surface water management and erosion control. 4. Remedial Revegetation, including seeding with successful seed mixes, but reducing seedling plantings due to wildlife impacts. EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 75 HOMESTAKE MINING COMPANY