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<br /> <br />Leaching of approximately 760,000 DSP tons of new ore will oocur <br />during 1989 on Fad No. 4. Rock will be stacked and leached on all <br />modules of the pad in 25-27 ft. lifts and sprayed at approximately <br />.003 GFM/ft2. The planned average spray rate will be <br />approx~~tely 1100 GPM total, up to 400 GPM of which may be <br />sprayed to Pad No. 3. Because of the interoonnected nature of the <br />systems aid production plans to operate both, the two systems must <br />be assessed together to adequately evaluate required solution <br />storage capacity. Total areas for which precipitation will be <br />intercepted for the two systems are as follows: <br />Oc~bined Pad No. 3 and Pad No. 4 Catc3mrlltS <br />Area f~ <br />Pad No. 4 660,000 <br />F~cparded Fad No. 3 Pad and Ponds - 1986 Actual: <br />Pad Area 291,980 <br />Fond Area (all ponds) 79,980 <br />Adsorption Catchment 1,320 <br />Pad ES:pansion - 1987 Actual <br />North and Back Sides 49,000 <br />South Side 107,500 <br />Pad No. 4 Pond Area Allowances: <br />t 14,000 <br />~'n 14 , 000 <br />~9~-7' 20, 000 <br />Fad No. 4 Adsorption Catctm~ent Allowance: 2,000 <br />Contingency/Ditchwork Allowance: 10,000 <br />1,249,780 ft2 <br />M~vi,mmm water wllected annually for the canbined systems is <br />calculated as follows: <br />33.0 inches precipitation over 1,249,780 ft.2 = 25,710,000 <br />On a conservative basis, the normal evaporation frran ponds, <br />unsprayed portion of the heap and moisture required to saturate <br />the ore in the pile may be neglected. Zhe only water loss frcen <br />2 <br />