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Sunnyside Mine Pool Mitigation <br /> Page 2 <br /> The procedure for the project is to simply pump alkaline waters, using either caustic soda or <br /> hydrated lime to supply alkalinity, into an old ventilation raise above the 2200 ore pass. The mixture <br /> will flow into the ore pass and mix with waters that flow towards the Terry Tunnel but will be <br /> diverted to the 2200 ore pass after the Terry Tunnel bulkhead valve is closed. The 2200 ore pass is <br /> connected to six different levels of the mine and is the major conduit for water to spread into the <br /> workings. See attached drawing. <br /> The schedule for pumping of alkaline waters is limited to the short summer runoff period, <br /> typically July and August, due to limited access to the 12,000 feet plus site (elevation). In an eight <br /> week period a total of 12 million plus gallons of water can be added to the pool per season. Pumping <br /> could continue until physical equilibrium is established. Annual evaluation will determine if <br /> continuation after initial year is warranted. It will take an estimated 195 million gallons to reach <br /> expected equilibrium. Based on water treatment experience, to raise the pH from 6.5 to 9.5 will <br /> require the addition of at least 200 tons of lime for quality of water at expected equilibrium. SGC <br /> would add additional lime to counteract acidity generated by the pool consuming its supply of <br /> oxygen. <br /> Work Plan <br /> 1) Once Sunnyside Basin is accessible a Drisco pipe line will be strung fr�m the diversion <br /> ditch into the drift which accesses the main orepass. The line will be usewump water and <br /> pH adjusting fluids into the orepass. <br /> 2)Pumping will be ongoing as long as there is water available and access to the basin is safe. <br /> The injection would be ongoing until it appears that the mine pool is reaching equilibrium. <br /> 3) Once the mine pool reaches equilibrium the piping will be disassembled. <br /> 4)Reclamation of the area is addressed as part of SGC's MLR Permit (M-77-378). <br /> Analysis <br /> Pumping of high pH waters with buffering capability will enhance the following aspects of the <br /> hydraulic seal project. <br /> 1) Will speed the process of achieving physical equilibrium and allow the physical system <br /> to be evaluated over a shorter time period than would occur naturally. <br /> 2) Will speed the process of achieving chemical equilibrium by offsetting the production <br /> of acidity while pool is deoxygenating. <br /> 3) Any waters that flow through the mine and eventually report to the surface as seeps and <br />