2011-03-14_REVISION - M1977493 (57)

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Permit Amendment (AM-06) - Climax Mine CM0000484 The Storke Yard historically incorporated some mine waste rock material for construction fill. As discussed in Section T4.1.2, ore and waste rock from the Climax ore body contain sulfur complexes and have the potential to generate acid. Geochemical analyses of Storke Yard materials indicate that some areas of base fill may be potentially acid generating while other areas may not produce acid. The growth media and aggregate cover material that cover the Storke Yard are non-acid generating. Results of analytical testing are found in Appendix C of the original 1995 EPP. The areas of the mine in the upper Arkansas River watershed have been the focus of major reclamation activities since the late 1980s. Equipment was removed and buildings were demolished in preparation for final reclamation of the Storke Yard in 1995 and beyond. Presently, only the Arkansas Well, the 5-Shaft Headframe (housing the 5-Shaft Pump Station), and the Storke Wastewater Pump Station remain and the site has generally been reclaimed. A project to restore a buried segment of the East Fork Arkansas River running along the south side of the Storke Yard was completed in 2008. The area of the Arkansas River to the south-southwest of the Storke Yard was reclaimed in the late 1980s into the early 1990s. This area terminates in the gravel pit at the Climax property line. The East Fork Arkansas River runs through this reclaimed gravel pit before leaving the property and is the source of domestic water as described in Exhibit G -Water Information. Construction of a new seepage collection system is planned in preparation for future mining activities at Climax. This seepage collection system is anticipated to be constructed from the Ceresco Ridge fill placement area to the tailing distribution house (TDH) and would tie into the existing east tailing delivery line (ETDL) system to convey seepage from the Ceresco area to the SDP. As described above, and as listed in Table T-3, the sources of potential contamination in the Arkansas River watershed include: ¦ Impacted water from the flooded underground workings; ¦ Run-off and seepage from the Storke Yard; and ¦ Run-off and seepage from road cuts and overburden on Ceresco Ridge above the Storke Yard. With the reclamation completed at present, issues related to run-off and seepage have been significantly reduced. There are no designated chemicals stored or utilized within the Arkansas River watershed. T-5.1.2 Environmental Protection Facilities Existing EPFs In the portion of the Arkansas River watershed affected by Climax Mine operations, the following existing controls are considered EPFs: ¦ 5-Shaft Pump Station (and associated Storke Pipeline); and ¦ Storke Wastewater Pump Station. Potential Future EPFs In the portion of the Arkansas River watershed affected by Climax Mine operations, the following potential future control is considered an EPF: ¦ Ceresco Seepage Collection System As the need for this facility is confirmed, and design details are developed, appropriate submittals will be made to DRMS as necessary. 5-Shaft Pump Station and Storke Pipeline: A pumping station installed in 5-Shaft maintains the water level at an elevation that does not threaten the flow of impacted water to the Arkansas River Valley. Stormwater becomes impacted as it passes through the open pit area and collects in the underground mine workings. The quantity of water entering the shaft fluctuates seasonally based on the amount of Exhibit T T-12 May 2010