Laserfiche WebLink
Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design <br />The water balance operates on the principle of conservation of mass summarized as <br />follows: <br />Inflows + Previous Storage — Outflows = New Storage <br />All water entering the VLF is accounted for and tracked within the model. The model <br />inflows within the water balance are: <br />• Precipitation; <br />• Applied barren solution to the ore (a maximum of 17,000 gpm); <br />• Natural moisture contents in the ore; and <br />• Make -up water. <br />Outflows from the water balance include: <br />• Evaporation; <br />• Moisture uptake losses within the ore; and <br />• Solution removed for processing (a maximum of 17,000 gpm). <br />A probabilistic model was used because precipitation and evaporation vary month by <br />month and from year to year. This variability or uncertainty in the amount of <br />precipitation from month to month was accounted for in the water balance model by <br />developing a precipitation model for the Cresson Mine site. The precipitation model <br />was developed using actual measured precipitation data collected from January 1996 <br />through December 2010. <br />7.2 System Analysis <br />7.2.1 System Inflow Evaluation <br />As indicated, the inflow has four components: (i) fluid applied as barren solution; (ii) <br />direct precipitation falling onto the VLF; (ii) moisture contained in the matrix of the ore <br />as it is delivered to the VLF; and (iv) make -up water. During operations, CC &V applies <br />barren solution to the VLF according to the design criteria presented in Section 1.4. <br />Monthly precipitation was modeled using statistical historic climatological data and <br />recent site climatological data recorded by CC &V. Data used for precipitation and <br />evaporation distributions are summarized in Appendix G. The amount of precipitation <br />that is statistically predicted to fall on a monthly basis is applied at the surface of the <br />VLF. The inflow into the PSSA is calculated based on the lined area reporting to the <br />PSSA. <br />Data provided by CC &V indicate that the average moisture content of the ore delivered <br />to the VLF is 5.6 percent by dry weight (see Appendix B.7). The average moisture <br />content of the delivered ore was multiplied by the dry tons of ore delivered monthly to <br />Project No.' 74201125G0 Page 37 <br />1 September 2011 <br />amed3 <br />