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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department o(Nalura Resources <br />1313 Sherman 51., Room 215 <br /> <br />Denver, Colorado 80203 I~~~~ <br /> <br />Phone: 1303) 856-3567 I <br />FAX (303) 832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> RESOURCES <br /> Roy Romer <br /> Governor <br />DATE: June 22, 1994 lames s. Eochheaa <br /> Execmive Director <br /> <br />TO: Berhan Keffelew Michael B. Long <br />Dnsion D~re~~or <br />FROM: Allen Sorenson~~ <br />RE: Durability and Slake Testing of Granitic Rock in the Leach Pad Footprint, <br />Cripple Creek and Victor Gold, Cresson Project, File No. M-80-244 <br />I have reviewed the physical testing results submitted for the material proposed to be used <br />for construction of the leach pad underdrain. This testing demonstrates that the granite <br />proposed for use is comprised of anon-slaking type material, however the durability of this <br />material is questionable based on the results of testing in the Los Angeles Abrasion Machine. <br />This testing resulted in 47.7 percent loss in weight from the sample. The Division will not <br />accept underdrain materials that lose more than 40 percent by weight during the L. A. test. <br />The operator has to meet this minimum requirement before the Division can give written <br />approval to use this material. <br />M: \OSS\amm\memoac s. bk <br />