2011-03-14_REVISION - M1977493 (48)

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Permit Amendment (AM-06) - Climax Mine CM0000083 impacted waters at the site. Reference Section G-8 for a description of the CIVIC water rights portfolio. is G-4.7 Other Process Water Handling Systems Some modifications to the process water handling system will be required for the Phase II Deposition scenario. A general arrangement of the system is shown on Figure AM-06-G-02 and a schematic depiction of the Phase II Deposition facility configuration is shown on Figure AM-06-G-10. The modifications include the eventual inundation of the 3 Dam Pump Station and seepage collection system by Mayflower TSF. In addition, due to the potential for increased seepage rates at the toe of 5 Dam, the capacity of the Mayflower Seepwater Pump System may need to be increased and the discharge pipeline from this pump system will need to be modified to discharge directly into the water pool on Mayflower TSF. Under the current configuration, the 5-Shaft Pump System dewaters a portion of the existing underground mine workings and maintains the underground water levels well below the apex of the Mosquito Fault. As the open pit is developed, however, it will progress to depths below the current dewatering level of the 5-Shaft system. When this occurs, a new system to dewater the open pit will be required. Because of the impacted nature of this water, the new pit dewatering system will deliver impacted mine and pitwater to the ETDL, which will convey it to the SDP for first-stage treatment and discharge it into the process water circuit. Interceptor canals may also be constructed within the pit to reduce the volume of water requiring pumping. G-4.8 Water Treatment Systems During the Phase II Deposition period, the SDP will continue to be used to provide first-stage treatment of impacted waters, with the sludge pumped into the tailing delivery line. However, first-stage treatment of all other impacted water will take place in the Mayflower TSF water pool. Again, the pH of the tailing slurry is expected to be consistent with first-stage treatment. Excess water in Mayflower TSF will be decanted and delivered to the new PDWTP. The new PDWTP is required to provide second-stage treatment of the impacted waters prior to discharge to Tenmile Creek. The flow capacity of the PDWTP will limit the total discharge capacity of the process water system. This is a significant change from the Phase I Deposition system and will require the management and operation of storage facilities at the site to regulate treatment plant inflows. It will also be necessary to accurately regulate the flow rate discharged from the Mayflower TSF water pool so that the treatment plant capacity is not exceeded. Sludge that is generated at the treatment plant will be pumped into cells on the Mayflower TSF. The main detention storage capacity during spring runoff will continue to be the water pools on the Mayflower and Tenmile TSFs, with some additional storage provided by Robinson Lake. It is expected that the additional crest raises on Tenmile TSF during Phase I Deposition will increase the operational storage capacity of that facility. It is also expected that the operational storage capacity of the-Mayflower TSF water pool will increase as tailing is deposited in this facility. A detailed water balance analysis will be necessary to determine the appropriate PDWTP capacity. G-4.9 Domestic Water Systems Significant changes to the domestic water systems are not expected forthe Phase II Deposition scenario. The systems will remain as previously described with the possible exception of domestic water supplied to the new PDWTP. G-5 Closure Water Management G-5.1 System Overview The closure scenario occurs after mineral extraction and production at the site have permanently terminated. The facility configuration described herein has been developed for planning purposes. During this period, the site will be reclaimed and significant changes to the water handling systems will take place. It is expected that certain impacted waters will continue to require treatment thereby necessitating the operation of many of the Exhibit G G-10 May 2010