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February 25, 2000 <br />consolidation had ceased. The sample was saturated with water and allowed to drain prior to <br />the first load being applied. <br />The crushed ore was then tested for percolation rate, following the same methodology as that <br />used for the ROM ore sample. <br />2.3 Testing Results <br />The maximum percolation rates for the ROM and minus 7/8 inch Cresson Ore samples all <br />measured 0.045 gpm/sf under the incremental loads. This percolation rate is ten times the <br />solution application rate used at CC &V. At all tested load increments, no ponding of water <br />was observed. The percolation test data clearly show the ore is capable of supporting high <br />percolation rates, even under an equivalent heap height of 565 feet. <br />In addition, the test results show the ROM Cresson Ore will strain approximately 10 percent <br />under the load of 432 psi, while the crushed ore will strain approximately 16 percent under the <br />same loading. <br />After the percolation - consolidation tests were completed, the ore samples were tested for <br />gradation to evaluate mechanical degradation under load. The post -test gradation data and the <br />consolidation data are presented in Attachments A and B. The ROM Cresson Ore sample did <br />not show any appreciable change in gradation due to the consolidation under load. The minus <br />7/8 inch ore did show a small increase (about 3 percent) in fines resulting from the <br />consolidation under load. <br />3.0 CLOSURE <br />If there are any questions or concerns regarding this report or the test data, please call us at <br />(303) 980 -0540. <br />Sincerely, <br />GOLDER ASSOCIATES INC. <br />gw David M. Dix <br />Laboratory Manager <br />DMD /JFL/ljd <br />Attachments: <br />-3- 993 -2075 <br />F. Lupo, Ph.D., P.E. <br />Sr. Project Manager <br />Tables <br />Figures <br />Attachment A - ROM Cresson Ore <br />Attachment B - Crushed Minus 7/8 inch Cresson Ore <br />