2018-08-22_REVISION - M1977493 - Laserfiche WebLink

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Technical Revision (TR -28) 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. Portions of the Mayflower Tailing Storage Facility (TSF) and 5 Dam were capped and vegetated. 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 most of the surface 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 (TR -22). The water treatment system has been upgraded with the installation of an on-line lime slaking facility and Sludge Densification Plant (SDP), and with construction of the Property Discharge Water Treatment Plant (PDWTP). 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 include the rehabilitation of Tenmile Tunnel, a new Tailing Delivery Line (TDL), the Robinson Lake Pump Station and Pipeline and the new mill building. TR -19 consisted of the Property Discharge Water Treatment Plant (PDWTP) that is part of the Climax water treatment system for stage 2 metals removal that began operating in July 2014, and TR -21 describes the Mayflower Flood Bypass Tunnel (for emergency water release) and Reclaim Water System (including a new barge and pipeline system). Major components and facilities at Climax include the open pit and underground mine, overburden storage facilities, or OSFs (McNulty and North 40) that were approved under TR -22 and TR -25, 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 (providing stage 1 metals removal) and PDWTP (providing stage 2 metals removal), the Robinson TSF (undergoing final reclamation), Tenmile TSF (approved under TR -20, the Mayflower TSF (approved under TR -23), the clear water Interceptor System, and the Lake Irwin wetland mitigation area (approved under TR -26). Since Climax dates to 1918, some of these components or their predecessors are historic, pre- dating the Colorado Mined Land Reclamation Act by decades. Ancillary fresh water facilities not owned or managed by Climax, including Clinton Reservoir and Eagle Park Reservoir, are important site features and 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 in the Eagle River Watershed feeds 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 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 also are in various permitting documents submitted to DRMS including the 1977 Climax Mining and Reclamation Permit, Reclamation Permit Amendments, and Technical Revisions. T-2 Other Agency Environmental Protection Measures T-2.1 Genera/ 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. EPP: Version R4 T-5 August 2018