Laserfiche WebLink
., <br />~II ~I~~I~~I~~~~~ ~I~ <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Nalu ral Resources <br />1313 Sherman 51., Ronm 215 <br />Denver, Colorado 80203 <br />Phone: (3(131 866-5567 <br />FAX:(}031&32-8106 <br />DATE: July 24, 1996 <br />T0: Berhan Keffelew <br />FROM: Jim Pendleton <br />\4~~ <br />~~ <br />DEPARTMEN"I' OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames S. Lochhead <br />E~ewlive Dveaor <br />Michael B. Long <br />Dn•ision Director <br />RE: "Bentonite A iti to Soil Liner Fill - <br />Stability An is File" & "Procedures and <br />Materials For 1996 Construction, Drain Cover <br />Fill Thickness"; Cresson Project <br />(Permit No: M-80-244) <br />I have reviewed the two above referenced documents, which you <br />forwarded to my attention. <br />Stability of Bentonite Amended Soil Liner Fill <br />The stability analysis using the interfacial shear strength of the <br />bentonite amended :fill demonstrates that the use of the material <br />will not compromise the structural stability of Cripple Creek & <br />Victor Gold's (CC&VG's) Cresson Project heap leach pile. <br />Drain Cover Fill Thickness <br />This submittal presents the results of the freeze-thaw / <br />permeability testing of the soil liner fill material. The tests <br />determined that the effects of freeze-thaw upon the permeability of <br />the fill are insignificant. While the extremely low permeabilities <br />encountered within the test specimens suggest the application of a <br />zealous compaction effort, the overall effect of freeze-thaw <br />cycling appears to be a densification of the specimen with <br />successive freeze-thaw cycles. Therefore I concur with Mr. <br />Hardaway's conclusion that CC&VG has met its commitments as <br />described in its letter of May 15th and that it has demonstrated <br />the suitability of two feet of Drain Cover Fill for the Phase II <br />pad construction. <br />