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Cripple Creek & Victor Gold Mining Company <br />P.O. Box 191 <br />2755 State Highway 67 - <br />Victor, Colorado 80860 <br />Golder Associates Inc. <br />44 Union Boulevard, Suite 300 <br />Lakewood. CO USA 80228 <br />Telephone (303) 980-0540 <br />Fax (303) 985-2080 <br />February 25, 2000 <br />Attention: Jvir. Ron Roberts <br />RE: PERCOLATION - CONSOLIDATION TESTING RESULTS <br />ROM AND MINUS 7/8 ORE <br />Dear Ron: <br />'Golder <br />Our Ref.: 993 -2075 <br />Golder Associates Inc. (GAl) is pleased to present the results of testing conducted in support of <br />Cripple Creek & Victor Gold Mining Company's (CC &V) Valley Leach Facility. This report <br />details the results for gradation and percolation versus consolidation testing performed on <br />samples of Run of Mine (ROM) and crushed minus 7/8 inch Cresson ore. <br />1.0 MATERIAL DESCRIPTION <br />Samples of Cresson ore were provided by CC &V and used in the percolation- consolidation <br />testing program. The general ore sample gradations and description are summarized on <br />Table 1. Detailed gradations are presented in Attachments A and B. Both samples classify as <br />a fine to coarse gravel with some fine to coarse sand with little fines. <br />2.0 CONSOLIDATION AND PERCOLATION TESTING <br />Consolidation and percolation tests were conducted on the Cresson ore samples. Each sample <br />was prepared and incrementally loaded to a maximum stress of 432 pounds per square inch <br />(psi) consolidation pressure [equivalent to a heap height of 565 feet based on a bulk ore density <br />of 110 pounds per cubic foot] and measured for compression, settlement and maximum <br />percolation rate at select load increments. The maximum test pressure of 432 psi is the <br />maximum capacity of the testing apparatus. <br />2.1 Test Apparatus <br />The testing apparatus consisted of a 12 -inch nominal inside diameter (ID) aluminum tube <br />(testing cell), approximately 18 inches in height. Figure 1 shows the assembled testing cell. <br />�;. The cell was clamped to the base plate and the tie -down rods anchored to the cell base plate. A <br />porous loading plate was placed in contact with the material and a hydraulic jack was used to <br />apply the force to the sample against the top plate. A digital pressure transducer was used to <br />