Laserfiche WebLink
Parameter _ Value <br /> Typical solution appi"lion rate Approximately 0.003 gpm/tt=,but may vary <br /> _ - - - - --- <br /> Phase 5 VLF Average area under leach 4.8 million square feet <br /> As-dellvered ore moisture content 6.6_percent(average 1998 and 1999) <br /> Fieid capacity ore moisture content 7.6 percent(average) <br /> Leaching ore moisture content 9.5 to 10 percent <br /> Phase 5 VLF PSSA typical operating heard 20 feet <br /> Draindown period _ Varies as a function of ore height <br /> Precipitation fluetualions 95-percent confidence limit <br /> Design storm event 100•yewg4-hour <br /> Phase 5 VLF Area(plan area) 6 million fe <br /> 1.3.5 Phase 5 VLF Liner Systems <br /> Parameter Value <br /> Ore Storage Area Composite Liner System <br /> Soil liner fill(SLF) 12 inches minimum compacted,with a maximum hydraulic conductivity of 10-Bcm/s <br /> Geomembrane 80--mi LLDPE textured, single-sided, except where the side slopes are 2H:1V, where 80-mil <br /> LDPE textured,double-sided is used. <br /> Drain cover flfl(OCF) 2 feet minimum <br /> PSBAComposite LI nor System <br /> Soil liner fill(SLF) 12 inches minimum compacted,with a maximum hydraulic conductivity of 10Cmis <br /> Lower geomembrane 100-mil LLDPE textured, single sided, except on PSSA embankment where 100-mil LLDPE <br /> textured,double-sided is used <br /> Law volume solution calection fill 3 feet minimum in PSSA <br /> (LV8CF) <br /> Upper geomembrane 100-mil LLDPE smooth, except on PSSA embankment where 100-rail LLDPE textured. <br /> double-sided is used. <br /> Drain cover fill(DCF) 2 feet minimum,thicker over primary solution collection pipes <br /> 1.3.6 Stability Analysis <br /> Parameter Value <br /> Cresson ore shear strength 40 degrees and no cohesion <br /> Phase 5 tests indicate 23.5 degrees(large strain),but 18 degrees was <br /> Textured LLDPE geomembrane/SLF interface adopted based on previous testing <br /> shear strength Interface shear in Phases I through IV based on values presented in <br /> Arri ent No.8 <br /> Operational design earthquake Peak Ground <br /> Acceleration(PGA) 0.14 g <br /> Closure design earthquake PGA 0.08 g <br /> Minimum acceptable operational static factor of 1.3 <br /> safety _ <br /> Minimum acceptable operational pseudo-static <br /> 1.0 <br /> _factor of safety <br /> Minimum reclaimed slopes static factor of safety 1.5 <br /> Minimum reclaimed slopes pseudo-static factor of 1.1 <br /> safety <br /> 35 <br />