2021-08-17_REVISION - M1977342 - Laserfiche WebLink

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TR-34 to Permit M-1977-342 Environmental Protection Plan 2. DESCRIPTION OF SITE AND SITE FIGURES 2.1. Henderson Mine & URAD Water Treatment Plant The Henderson Mine is an underground mining operation that extracts molybdenite ore from beneath the base of Red Mountain and transports it via conveyor through a 9.6 mile tunnel and 5 mile overland conveyor to the Henderson Mill for milling and flotation concentrating. The final product is molybdenum disulfide (MoS2) concentrate that is transported out of the state for final processing. The Mine is located on the north side of Red Mountain near the confluence of Butler Gulch and the West Fork of Clear Creek. It is 9 miles west of Empire, Colorado, in Clear Creek County on the eastern slope of the Continental Divide.The elevation at the mine site is 10,400 feet above mean sea level (AMSL). Facilities at the mine site include shafts, support facilities, storage yards, the subsidence area on Red Mountain, the water conveyance pipeline between the Mine and URAD, and the URAD Industrial Water Treatment Plant (WTP). 2.2. Henderson Mill The Mill is located in Grand County, Colorado in the upper Williams Fork River valley approximately 22 miles south of Parshall, Colorado. The Mill site and all facilities are on the western side of the Continental Divide in the upper Colorado River drainage basin. Facilities include the portal and conveyor, mill complex, and the tailing storage facility (TSF). An industrial WTP at the Mill (the Mill WTP) is currently in the design phase, and construction is planned between 2022 and 2024, depending on climatic conditions and water balance. Physical and environmental descriptions of the Mine and Mill site including location maps are found in the Reclamation Permit (Sections 2 and 6) as modified. Section B of the Reclamation Permit shows the general location of the Henderson Mine and Mill. 2.3. Site Figures • Figure 1: Henderson Mine General Site Layout, EPFs 1.1, 1.2 and 1.3 and Designated Chemical Storage - Illustrates the general site layout of the Mine and the location of surrounding water bodies; and the location of the EPFs associated with the mine water and URAD WTP,stormwater diversion system, Pond 1.2 and designated chemical storage. • Figure 2: Henderson Mill General Site Layout - Illustrates the general site layout of the Mill and the locations of surrounding water bodies. • Figure 3: Henderson Mill EPFs 1.1, 1.2 and 2.1 — 2.10 — East Branch Reservoir System, Mill Process Water Storage Tanks and Designated Chemical Storage - Illustrates the locations of the Henderson Mill EPFs associated with the East Branch Reservoir system, the process water storage tanks, and designated chemical storage. • Figure 4: Henderson Mill EPFs 1.3,1.4, 1.5, 1.6, 1.7, 1.8 and 3.1—Tailing Delivery System, Tailing Storage Facility,Seep Water Collection/Return,Groundwater Extraction System, Ute Park Pump Station, Stormwater Diversion System and Mill WTP - Illustrates the Climax Molybdenum Company August,2021 Henderson Operations Page 3 of 46