2012-02-28_REVISION - M1980244 (77)

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41 03SmIoTH 1 from approximately 65 %. From the pH Adjustment Tank slurry will be directed by gravity to the first of six leach tanks (approximately 173,000 gallons in size each) in a single train via a distribution tank. Leach tanks outlets will be stepped for gravity flow at a rate of approximately 200 gallons per minute. Each tank will be fitted with an agitator to ensure the ore makes contact with the lime and cyanide solution. Air will be introduced to each tank through top entry sparging lines which discharge below the agitator blades. The discharge from the last leach tank will flow into the CIP Circuit Feed Tank. The leach circuit discharge slurry will be pumped to the CIP circuit at a rate of approximately 211 tons per hour. 2.6.CIP Circuit Design Summary Squaw Gulch High Grade Mill Facilities 2.7. Processed Ore Thickeners and Process Water Tanks 1/24/2012 Page 4 of 6 The CIP circuit consists of eight tanks (approximately 12,000 gallons in size each) where activated carbon is introduced from the slurry from the Leach Circuit at 1.5 tons twice per day. The activated carbon in the CIP tanks allow the adsorption of the gold in solution onto the carbon particles. Each of the five CIP tanks will be charged with activated carbon (approximately 1.5 tons in each one), Each tank will be equipped with Pump Cells that allow the transfer of slurry from tank to tank without transporting the activated carbon. The slurry moves through all of the tanks and is transferred from the last tank to the CIP Processed Ore Sump. From the CIP Processed Ore Sump, the slurry is pumped to the High pH Thickener for water recovery. On a regular timed basis, the contents of each CIP tank containing the activated carbon and associated ore slurry will be pumped to a Preg Carbon Wash Screen to remove the loaded (gold containing) carbon from the pumped slurry. The carbon is washed and loaded into a tank truck (approximately 5 tons at a time) and then transferred for further processing and gold recovery at the existing AGADR facility. The screen underflow slurry, now without carbon, is pumped back into the CIP Circuit. The thickeners are used to capture as much water as possible for reuse in the High Grade Mill facilities. The processed ore thickeners will consist of the Processed Ore Thickener that de- waters the Flotation System processed ore and the High pH Thickener that dewaters the CIP processed ore. The clear overflow solutions from these thickeners are kept separate in the High Grade Mill facilities to keep any residual cyanide separate from the grinding, flotation, and regrind circuits. Water that does not contain any residual cyanide is stored in the Process Water Tank, which is approximately 417,000 gallons in size. Water that may have traces of Cyanide will be stored in the High pH Process Water Tank (which is approximately 28,000