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(:OLORADO DIVISION OF MINERALS AND GEOLOGY <br />ESTINP,TING FORM - CYANIDE HEAP LEACH DETOXIFICATION <br />Task no. 15 Prep. by: SSS Task filename M165-15 <br />Date: 28-Jul-95 Permit #: M-81.165 Hine: Neglected Mine <br />Permit action: Succession of Operator <br />Task description: Detoxify Heap Leach Pad <br />LEACH PAD QUANTITIES: <br />Leach pad volume = 2,!145 cu. yds. or ........... .. ....... = 76 ,815 cu. ft. <br />Material density = 2.800.00 lbs ./cu. yd. Total leach pad weight = 1.966 .000 pounds <br />Percent pore space = l0.DD00% of pad volume. Total pore volume = 57 .458 gallons <br />Data reference assume 160' x 60' pad at present 8' thick <br />INITIAL CYANIDE CONTENT: <br />Initial concentration= 56 ppm. Weight of 1 pore volume = 479. 197 pounds <br />Cyanide quantity = 26.84 lbs. total <br />Source of data last sampling of leachate in June 1985 <br />DETOXIFICATION PROCESS 8 ASSOCIATED COSTS: <br />STEP 1 ... SUBTASK A description NA - Pad inactiv since 1985 (rainwater rinsing over time) <br />Quantities ^ <br />No. of pore volumes = 1 Total quantity of rinse water = 57.458 gallons <br />Base pumping rate = 120 gpm. Mechanical availabi lity of pump = 95.00% <br />Adj. pumping rate = 114 gpm. Hours/shift = 8 Shifts/day = 1 <br />Total pumping time = 8.40 hours or...... 1.05 days or... 0.04 months <br />Materials <br />Cost of water = 50.0300 per gallon times total gallons = 51.124 <br /> Misc. Eqp. Addit. <br />Equipment 8 Labor Primary Backup Suc./Dis . Electric Backup Item #1: Labor <br /> P U <br />it <br />) <br /> Pump ump Hose(s) Power Generator n <br />(s <br />Qwnershipfhr.. . 50.00 50.00 50.00 50.00 50.00 50.00 50.00 <br />Operating/hr.. . 50.00 50.00 50.00 50.00 50.00 50.00 50.00 <br />Operator lhr.. . 50.00 50.00 50.00 50.00 50.00 50.00 50.00 <br /> 50.0(1 50.00 50.00 50.00 50.00 50.00 50.00 <br />Subtotal...... , 50.00 !hr times 8.4 job hrs ........... = SO <br />page 1 of 3 <br />