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<br />WATII2 BAIAtXE i1Pf]A'A? FOR (RTPPfF. CRI~1C AND VICIQ2 GOID ?~~ QMPANY- <br />1989 OPII2ATIQ~15 <br />Fad No. 2 - Inwer Carlton Site (with 1988 expansion) <br />A. Annul Water Salome C~llculations <br />Annual water balance calculations are based on worst~ase <br />analysis, using a maxinnrm yearly precipitation of about 33 inches <br />of water (the maY;,,nnn reCOrL)ed value) . `lYle spraying/leaching <br />season is assumed to Dover the months mid-April through mid- <br />Nwember each year. Hick-precipitation years typically show 75~ <br />to 80$ of the annual precipitation during these months. <br />I.eadiing of slightly wer 200, 000 I1S'f of new dump rock in the <br />expanded pad size will be conducted in three segments during 1989. <br />Rock will be stacked up to 30 feet high and sprayed at 0.003 <br />GPM/ft2. 'Ihe planned average spray rate is 500 GPM. Zhe actual <br />arnaa for which precipitation will be collected are unchanged <br />from 1988 operations: <br />~f~l <br />7bta1 Fad Area: 1987 317,820 <br />1987 bcpansion 20,000 <br />1988 Expansion 103,000 <br />Unlined Drainage: 30,000 <br />Pond 5: 42.000 <br />~l'AL (ft2): 512,820 <br />Mariim im water collected annually is calculated as follows: <br />Annually: 33.0" precipitation wer 512,820 ft2 = 10,550,000 <br />gallons. <br />On a conservative basis, one may neglect mrmal evaporation frcun <br />ponds and unsprayed heaps aryl neglect the moisture required to <br />saturate the ore in leach modules. Zhe only water loss from the <br />system is for spray-induced evaporation, which is conservatively <br />estimated at 15 percent of the solution pumped to the heaps. At a <br />500 GFM spray rate and 205 targeted days of operation, the max,nnim <br />estimated water loss (20 hour basis) is 18.45 million gallons <br />annually. <br />