2024-03-28_REVISION - M2015030 (2)

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Chavers Mining Resource DRMS Permit No.M-2015-030 Amendment No.2(AM-02) March 2024 Page 9 future market conditions. ASCI will complete backfill to the minimum requirement of one(1) foot above the historic high measured water table elevation,but not to exceed pre-mining elevations within 5-years of the date the extraction of material and stockpile removal is complete. Should completion of Reclamation Phase 1 not be feasible within five(5) years from the date ASCI informs the DRMS that all material extraction and stockpile removal is complete, an extension will be submitted based on the remaining backfill volume required at that time. ■ Reclamation Phase 2: Grading,Topsoil, Seeding, and Growth Monitoring—In Reclamation Phase 2, any existing structures will be removed, Site contours for the ±87 acres of affected area will be graded to approximately 1 - 2 feet below final grade, and a minimum final cover topsoil layer twelve(12) inches thick will be placed across the affected area. Changes to topography will be made as necessary until the final grade is within acceptable limits (a minimum of one [1] foot above the historic high measured water table elevation, but not to exceed pre-mining elevations). Once final grade is achieved, site seeding, fertilizing, and mulching will occur in the subsequent fall season. Growth and progress of the grass will be monitored quarterly to ensure a successful transition back to rangeland use. It is anticipated that a successful transition to rangeland will occur within five(5) years from the date ASCI informs the DRMS that Reclamation Phase 2 has commenced. 3.1.4 Public Use: The public will not be allowed on the land while mining and reclamation activities are in progress.After reclamation is complete and the bond released,the public will only have access to the land adjacent to the South Platte River that will be dedicated to the City of Fort Lupton. 3.1.5 Reclamation Measures — Materials Handling: Measures will be taken to meet the following requirements. (1) The Site will be graded to a minimum of one (1) foot above the historic high measured water table elevation, but not to exceed pre-mining elevations. The approximate maximum final contours are shown on Exhibit F - Reclamation Plan Map. (2)No toxic or acid-forming materials will be included in backfill material. All backfill materials will be compacted during the filling process. (3)Grading will be done to control erosion and siltation on the affected lands and protect outside areas from slides. No high walls will be left exposed. (4) Once backfill activities are complete at the Site, grading will occur as quickly as feasible. (5)No acid-forming or toxic producing materials are associated with materials mined at the Site. On-site refuse is maintained by contracted vendors to control unsightliness and protect the South Platte River drainage system.