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Permit M-1977-493—Climax Mine Technical Revision 37 (TR-37) <br /> has been successfully established on portions of 3 Dam and 5 Dam. 3 Dam and 5 Dam have previously had 66 <br /> acres and 25 acres of bond released, respectively. <br /> 1 Dam has been partially revegetated as a result of the Robinson Lake clean-out project (TR-15). This project, <br /> initiated in 2008, was designed to expand the process water capacity of the lake. During the project, native soil <br /> materials were encountered that had been historically buried under the lake. These native soil materials were <br /> used on 1 Dam as an added benefit for reclamation. <br /> E-3.5 Searle Gulch Historic Mining Area <br /> Numerous inactive mine sites in the Kokomo Creek and Searle Creek were reclaimed in a program that was <br /> initiated at the Climax Mine in 2006. Mine wastes were loaded and hauled to identified depositories near active <br /> Climax tailing areas. Each of the 26 mine sites were then graded to the approximate original contour. Soils were <br /> then amended and revegetated. In all, 240,000 cubic yards of waste rock were removed and hauled, 43 acres <br /> were regraded, and 18,000 cubic yards of soil amendments were hauled and placed. Climax is monitoring the <br /> results of this voluntary reclamation project. <br /> E-4 Water Management <br /> Water management for both fresh and process water is a critical component of Climax's mining and reclamation <br /> operations. Detailed descriptions of the water management plan for production and at closure are included in <br /> Exhibit G: Water Information. <br /> Of additional importance to reclamation is the control of erosion and sediment runoff. Climax has obtained <br /> coverage under the Colorado Discharge Permit System (CDPS)—Stormwater Discharges Associated with Metal <br /> Mining Operations and Mine-Waste Remediation program (Certification No. COR-040178) and maintains a <br /> current Storm Water Management Plan (Climax Molybdenum Company 2022); Climax conducts regular <br /> inspections as directed by this plan. Best management practices (BMPs)to control erosion and sediment (e.g., silt <br /> fence and straw wattles) are regularly installed, inspected, and maintained as needed throughout the mine site. <br /> BMPs will continue to be used routinely during production and reclamation activities as needed to comply with <br /> regulations. Discharges included in the stormwater program are located outside of the active mining and industrial <br /> areas and include areas such as reclaimed sites, access roads, etc. <br /> Water discharges occurring from within the active mining and industrial areas are managed under Climax's CDPS <br /> No. CO0000248; this permit contains effluent limitations, monitoring requirements and other conditions regulating <br /> water quality. <br /> E-5 Grading <br /> As stated in previous approved plans, disturbances with slopes that need regrading will, whenever possible, be <br /> graded to no steeper than 2H:1 V and 3H:1 V slopes for OSFs and TSFs, respectively. TSF outslopes have been <br /> constructed at slopes of 3H:1 V or flatter and do not require any regrading during reclamation activities. The <br /> design of the OSFs will incorporate stability evaluations based on this maximum overall composite slope of <br /> 2AH:1 V. All OSF outslopes, currently at the angle of repose, will similarly be regraded to a maximum interbench <br /> slope of 2H:1 V. Final OSF slopes are anticipated to be regraded and may achieve slopes flatter than 2H:1 V to <br /> promote long-term stability (Exhibit D, Section 3.3). Ultimately, grading will be implemented to maintain drainage <br /> control and stability. When possible, shallower slopes will be graded to promote revegetation. Exceptions to this <br /> general standard include the open pit. The majority of the open pit will not be graded. <br /> E-6 Growth Media <br /> The use of on-site soils to provide nutrients and organic matter, and enhance their water-holding capacity has <br /> historically been successful as growth media at Climax. This can be achieved with additions of a combination of <br /> seeds, mulch, and/or fertilizers. This section provides detail regarding the ongoing soil salvage and stockpile <br /> operations across the site as well as a discussion regarding various soil amendments historically used. <br /> E-6.1 Reclamation Cover Salvage <br /> Overburden soils (combined topsoil and subsoil) are being salvaged and stockpiled throughout the mine for future <br /> use as reclamation cover. Mobile equipment will be used to remove reclamation cover materials that will be either <br /> Exhibit E E-3 March 2024 <br />