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01:135miDTH <br />SQUAW GULCH VALLEY LEACH <br />FACILITY AND ADR PROCESS <br />DESCRIPTION & DESIGN BASIS <br />1/25/2012 <br />Page 1 of 3 <br />PROCESS DESCRIPTION <br />The Squaw Gulch Valley Leach Facility (SGVLF) will allow the solution leaching of gold ore from mine <br />areas at Cripple Creek & Victor Gold Mining Company's Cresson Project. The SGVLF and associated <br />Squaw Gulch Adsorption, Desorption and Recovery (SGADR) facilities will consist of a triple lined, <br />pregnant solution storage area (PSSA), a double lined ore storage area (OSA), associated pregnant and <br />barren solution pumping and piping, along with adsorption, desorption, and recovery of gold. <br />PREGNANT SOLUTION RECOVERY <br />The pregnant solution is recovered from the PSSA using vertical turbine pumps. The pumps are <br />mounted in pipe casings that extend to the bottom of the PSSA Tined surface. The pregnant solution <br />pump station is equipped with an installed spare pump and an emergency generator power supply to <br />ensure that the pregnant solution can always be recovered from the PSSA. The pregnant solution <br />pumps deliver the pregnant solution to the SGADR facility. <br />SQUAW GULCH ADR FACILITY <br />The SGADR Facility refers to the Adsorption /Desorption /Recovery plant used to recover the gold in the <br />pregnant solution. The SGADR facility will receive the pregnant solution from the SGVLF, remove the <br />gold in the solution by adsorption onto activated carbon, strip (remove the gold from) the activated <br />carbon after the adsorption stage, and recover the gold in an electrowinning circuit. The recovered gold <br />from the electrowinning circuit will be transported to the existing CC &V gold refinery located at the <br />Arequa Gulch Adsorption, Desorption and Recover (AGADR) facility for further processing. All reagents <br />required for the operation will be located at the SGADR facility and the SGADR facility will be <br />constructed within the triple -lined portion PSSA portion of the SGVLF. <br />CARBON ADSORPTION <br />Pregnant solution from the SGVLF will be pumped to a series of Carbon -in- Column (CIC) carbon <br />columns. A total of 4 trains of CIC carbon columns will manage a flow rate of approximately 16,000 <br />gpm. Each CIC carbon columns consist of 5 tanks in series that are partially filled with 5 tons of <br />activated carbon. The pregnant solution flows by gravity through these columns and the gold in <br />solution adsorbs (or attaches to the surface) of the activated carbon. The carbon is advanced from the <br />lowest (last) tank in the series to the highest (first) tank and is then pumped to the acid wash and <br />stripping circuits. The carbon at this point is referred to as loaded carbon. <br />CARBON ACID WASH <br />Carbon is introduced into an acid wash vessel. A diluted acid solution is added and the carbon soaks in <br />this solution for a pre- determined time to remove scale. After the scale is removed, the acid solution is <br />drained from the acid wash tank and the solution is neutralized with sodium hydroxide in a <br />