2011-12-15_REVISION - M1977493 (2)

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Technical Revision (TR -18) Climax Molybdenum Company Environmental Protection Plan Permit No. M- 1977 -493 Since the 1989 amendment, and continuing to date, a significant number of closure and reclamation activities have occurred at the site. The Mayflower Tailing Storage Facility (TSF) and 5 Dam have been capped and vegetated (this TSF, as discussed later, is part of the water treatment system). Except for 5- Shaft, the underground support facilities in the Storke Yard have been dismantled and the Storke Yard area has been reclaimed. The Oxide Pond (TSF) area (Eagle Park Reservoir; aka: 4 Dam Reservoir) has been reclaimed as a fresh water storage reservoir and sold to outside interests. 1 Dam has been resloped and capped, and seeded in some areas. The Robinson TSF has been capped with a rock cover and reclaimed using biosolids. The 2 Dam Spillway and a portion of the East Side Channel (ESC) have been constructed and are operational. Portions of the E and F Dumps have been recontoured and seeded. The E and F Dumps are located within the footprint of the overburden storage facility (OSF) now termed the North 40 OSF. The water treatment system has been upgraded with the installation of an on- line lime slaking facility and Sludge Densification Plant (SDP). A high capacity pump station was installed at the base of 3 Dam as part of the water treatment system upgrades. Numerous historical mine sites have been remediated and reclaimed. Finally, as previously mentioned, numerous unneeded buildings and structures in the mine and mill area have been dismantled and demolished. Infrastructure upgrades and system improvement projects previously approved under TR -14 and TR -17 are in various states of construction and include the rehabilitation of Tenmile Tunnel, a new Tailing Delivery Line (TDL), the Robinson Lake Pump Station and Pipeline and the new mill building. Major components and facilities at Climax include the open pit and underground mine, overburden storage facilities, or OSFs (McNulty and North 40), crusher and mill complex, the process water reservoir (Robinson Lake; aka: Robinson Reservoir) and its circuit, fresh water reservoirs (Chalk Mountain Reservoir and Buffehrs Lake) and their circuits, the SDP and the TSFs (Robinson, Tenmile, and Mayflower) and the clear water Interceptor System. Since the Climax Mine dates to 1917, many of these components or their predecessors are historic, pre - dating the Colorado Mined Land Reclamation Act by decades. Ancillary fresh water facilities not owned by CMC, including Clinton Reservoir and Eagle Park Reservoir, are important site features and although not managed by Climax do interact with Climax's water management system. The East Interceptor in the Tenmile Creek Watershed feeds fresh water into Clinton Reservoir and the reservoir provides flood control to protect the Mayflower TSF. The Chalk Mountain Interceptor and Upper North Interceptor in the Eagle River Watershed feed fresh water into Eagle Park Reservoir and Climax operates a seepage collection and return system from the toe of 4 Dam, the dam containing Eagle Park Reservoir. Detailed locations, descriptions, and map references of specific environmental protection facilities are found in Section T -5 and in the attached appendices as referenced throughout. Figure AM- 06 -T -01 illustrates the locations of major components and facilities. Detailed physical and environmental descriptions of the site including location maps have previously been submitted in the 1977 Climax Mining and Reclamation Permit (Sections T -3, T-4, and T -7) and five (5) Amendments and 17 Technical Revisions that have been submitted to the DRMS. Updated physical and environmental descriptions of the site including location maps are also provided in Exhibits to permit Amendment AM -06. T -2 Other Agency Environmental Protection Measures T -2.1 General Information The Climax Mine is regulated at various levels by the DRMS, the Colorado Air Pollution Control Division (APCD), and the Colorado Water Quality Control Division (WQCD). The latter two divisions are within the Colorado Department of Public Health and Environment (CDPHE). The WQCD administers Climax's Colorado Pollutant Discharge System (CPDS) permit and a storm water permit. As part of the storm water permit, Climax maintains a Storm Water Management Plan (SWMP). The SWMP addresses the handling of water that is outside of the water treatment system at Climax. Other state and federal agencies that regulate or oversee activities at the Climax Mine include the EPP: Version R2 T -5 December 2011