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~`_ l~ <br />SMITH WILLIAMS CONSULTANTS, INC. <br /> <br />Outflows from the water balance include: <br />^ Evaporation <br />^ Moisture uptake losses within the ore <br />^ Solution removed for processing (a maximum of 29,100 gpm). <br />A probabilistic model was used because precipitation and evaporation vary month by month and <br />from year to year. This variability or uncertainty in the amount of precipitation from month to <br />month was accounted for in the water balance model by developing a precipitation model for the <br />Cresson Mine site. The precipitation model was developed using actual measured precipitation <br />data collected from January 1996 through December 2006. <br />6.2 System Analysis . <br />6.2.1 System Inflow Evaluation <br />As indicated, the inflow has four components: (1) fluid applied as barren solution, (2) direct <br />precipitation falling onto the VLF, (3) moisture contained in the matrix of the ore as it is <br />delivered to the VLF, and (4) make-up water. During operations, CC&V applies barren solution <br />• to the VLF according to the schedule presented in the design criteria. The solution schedule <br />presented in the design criteria is subject to change to suit the mining plan and ore grades. <br />Monthly precipitation was modeled using statistical historic climatological data and recen_ t site <br />climatological data recorded by CC&V. Data used for precipitation and evaporation <br />distributions are summarized in Appendix G. The amount of precipitation that is statistically <br />predicted to fall on a monthly basis applied at the surface of the VLF. The inflow into the <br />PSSAs is calculated based on the lined area reporting to the PSSA. <br />Data provided by CC&V indicate that the average moisture content of the ore delivered to the <br />VLF is 5.6 percent by dry weight (see Appendix B). The average moisture content of the <br />delivered ore was multiplied by the dry tons of ore delivered monthly to the VLF to quantify the <br />moisture delivered to the VLF. The anticipated annual ore delivery schedule for the VLF is <br />presented in the design criteria. <br />Make-up water is calculated based on maintaining solution application to the VLF. The make-up <br />water requirements vary month-to-month depending on climatic conditions and ore placement. <br />n <br />~J <br />S:\PROJECTS\1125 CC&V PHASE 5 VLF\H2 - DESIGMAREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 43 <br />