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<br /> Description of Leach Facilities Water Balance Spreadsheet Columns <br /> 1. Ore on Pad - Cumulative tonnage of ore on the pad. Based on ore <br /> (col 10) production rate. <br />I <br />' <br />2. <br />Ore Leach - <br />The amount of ore under active leaching. =qual to the <br />' (col 11) amount of ore on the pad up to a maximum of 700,000 tons <br /> which corresponds to the maximum application rate. <br /> 3. Precip/RO - Monthly precipitation over entire leach fa~:ilities area <br />' (col 12) (staged pad areas approximated by an annual expansion). <br />' 4. Draindown - <br />(col 13) Free moisture which drains from one month's production <br />of ore as it finishes leach cycle. <br /> 5. Pond Area - Approximate surface area of solution in tFe ponds <br />' (cal 14) (roughly dated on Ht-Area-Cap relationshiFs). <br /> 6. Pond Evap - Monthly shallow lake evaporation from pond surface. <br />' (col 15) <br /> 7. Spray Evap - Solution lost to evaporation at the point of appli- <br /> (col 16) cation (assumed to be 0 for low energy emitters). <br />' ' <br /> 8. Ore Wetup Amount of moisture required to bring one month <br />s new <br /> (col 17) ore production up to leaching moisture content. <br />' ' 9. Balance - Summation of monthly inflows and losses (3+4-6-7-8}. <br /> (col 18) <br /> 10. Makeup - Monthly fresh water supplement to maintain minimum <br /> (col 19) pond volume. <br /> 11. Normal Storage - Calculated monthly pond storage volume (ba>ed on <br /> (col 20) balance and makeup) <br /> 12. Plus Draindown - Calculated monthly pond storage volume plu> a hypo= <br />' (col 21) thetical heap draindown. <br /> 13. Plus 100-yr sto rm-Calculated monthly pond storage volume inc'~uding both <br /> (col 22) a draindown and a 100-yr, 24-hr storm even*. <br /> <br /> <br />1 <br /> <br />1 <br />