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Climax Molybdenum Company HENDERSON MINE SWMP <br /> Empire, CO April 2021 <br /> 2.0 FACILITY DESCRIPTION <br /> 2.1 Facilities <br /> The Henderson Mine and Mill operate under the same CDPS General Permit No. C004000 <br /> and have the same Facility Number(COR040079). Henderson has developed three site specific <br /> SWMPs for the Henderson Mill, Henderson Mine/URAD WTP and inactive URAD Mine <br /> (Facility Number COR040080). Facilities covered by this SWMP are specific to the Henderson <br /> Mine and URAD WTP. Ore is mined in Clear Creek County at the Henderson Mine and <br /> transported to the Williams Fork basin through a ten-mile-long tunnel and five-mile-long <br /> surface conveyor system to the mill site, which is located in Grand County. The mine site was <br /> constructed in the early 1970s. The current ore conveyance system, which replaced the historic <br /> train haulage system, was constructed in the late 1990s. The mine serves the primary purpose <br /> of mining molybdenum disulfide ore (MOS2), as discussed in further detail below. <br /> 2.1 .1 Mine <br /> The Mine is located in Clear Creek County on the north side of Red Mountain near the <br /> confluence of Butler Gulch and the West Fork of Clear Creek. To access the Mine, exit I-70 at <br /> exit 232 (Empire, Colorado) and drive north approximately nine (9) miles on U.S. Highway <br /> 40 to the town of Berthoud Falls. Upon leaving Berthoud Falls, take the first road on the left <br /> and drive approximately 1.5 miles to the Mine's main security gate. <br /> Facilities at the mine site include shafts, support facilities, storage yards, and the Mine's <br /> domestic water treatment plant. These facilities are primarily constructed on development rock <br /> that was excavated during development of the Henderson Mine and associated shafts. The mine <br /> and URAD WTP property area includes approximately 2,843 total acres, of which <br /> approximately 2,478.8 acres are undisturbed, and 364.2 acres are disturbed by the mine yard, <br /> URAD WTP and associated facilities. Process water associated with the mine site, including <br /> domestic sewage and mine water, is treated and discharged under CDPS Permit Number CO- <br /> 0041467. The Southwest Energy, LLC contractor yard located on the east side of the mine <br /> facilities is on property leased from the Henderson Mine. Storm water runoff generated within <br /> the leased property boundary is managed and controlled by Southwest Energy, independent <br /> from this SWMP. <br /> Storm water at the Mine is discharged via identified storm water outfalls, both directly, and <br /> via Butler Gulch to the West Fork of Clear Creek. <br /> 2.1 .2 URAD Water Treatment Plant <br /> The inactive URAD Mine is located in Clear Creek County within the Woods Creek Valley in <br /> an unsurveyed portion of T3 S, R75W and R76W of the 6th PM, one valley to the south of the <br /> active Henderson Mine. The inactive URAD Mine area encompasses approximately 320 acres <br /> and consists of two reclaimed tailing impoundments, two plugged portals, water treatment <br /> collection ponds, and the WTP. With the exception of the URAD WTP and water treatment <br /> collection ponds, the reclamation of the disturbed areas associated with the inactive URAD <br /> Mine has been completed. Therefore, storm water runoff in the undisturbed and reclaimed <br /> areas at the URAD Mine is managed via the Inactive URAD Mine SWMP. Storm water runoff <br /> within the URAD WTP area is managed with this SWMP. <br /> Page 2-1 <br />