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Solution from the pregnant solution distribution tank is currently routed to the carbon <br />trains at the ADR to extract gold and then into the barren solution tank for recycling back <br />to the VLF for application. As part of the MLE Project, the solution enrichment circuit <br />will be upgraded at the ADR. This allows for an option to circulate pregnant solution <br />from Phases I, II and IV PSSAs onto Phase 5 VLF affecting enrichment of the gold in <br />solution. As part of the enrichment circuit upgrade, pregnant solution from the Phases I, <br />II and IV PSSAs can either be pumped to the pregnant solution distribution tank and into <br />the carbon trains at the ADR or can be pumped to the enrichment tank for routing to the <br />Phase 5 VLF. The enrichment tank is an existing tank located adjacent to the barren <br />solution tank and within the existing ADR containment system. The enrichment tank has <br />a capacity of 100,000 gallons. The pregnant solutions will be pumped from the <br />enrichment tank to the Phase 5 VLF using up to four 800 horsepower pumps that will be <br />similar to the current barren solution pumps. Fresh water will be added to the enrichment <br />tank as necessary to maintain a flow of approximately 11,000 gpm to Phase 5 VLF. It <br />should be noted that while it is expected that the majority of the leaching at Phase 5 VLF <br />will utilize pregnant (enriched) solution from Phases I, II, III and IV, the exact make up <br />of fresh water and pregnant solution may vary in accordance with pregnant solution <br />concentrations, economic considerations, and flow distributions indicated by the dynamic <br />water balance model for the VLF. <br />Once the solutions applied on the Phase 5 VLF reach the Phase 5 PSSA, the solution will <br />be pumped to the pregnant solution distribution tank at a rate of approximately 10,000 <br />gpm using four 100 horsepower pumps. The remaining approximately 1,000 gpm from <br />the application rate will be consumed in the ore material as the ore reaches field capacity <br />or lost as evaporation from the system. There is an additional pump online to serve as a <br />backup to keep solution circulating in the event that one of the primary pumps goes down <br />for any reason. <br />At the pregnant solution distribution tank., the flows are routed to the existing ADR <br />carbon trains for gold extraction and then recirculated to Phases I - IV via the barren <br />pumps. <br />Should line power go down for any reason, there will be backup generators that will <br />provide power to keep the pumping operational. Three backup generators currently are in <br />place adjacent to the ADR and provide the necessary power at the ADR in the event of <br />power failure to line power supply system. An additional three backup generators will be <br />TR 58 Revision - March, 2010 Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />7-4