Laserfiche WebLink
ID ~-689-3254 JUL 2~4 18 ~ 05 No .012 P .02 <br />~-.~~ Cripple Creek 8t Victor Gold Mining Company <br />(~ A JWnI VurtuC - Pikes PeY Mlnlnp canP.ny, wn.pw <br />`~J t(7 Op~ntions Otnu Enpbwaod Ottla <br />~/ P.O. Box 191, 2765 Slate Highway 87 5251 OTC Parkway, Suite 700, <br />Victor, Colorado 80880 Cotoredo 80111 <br />(719) 689-2877 • FAX (719) 689.925< (303) 889-0700 • FAX (303) 88 <br />July 22, 1994 <br />SENT BY FACSIMILE -COPY FOLLOWS BY MAIL <br />Englewood <br />9-0707 <br />Mr. Berhan Kcffelew <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Mines and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Reference: Cresson Project: Permit Number M-SO-244: Commitment Number "33" <br />fSllecificationsl -Gradation Slxcification Modification of the Soil Liner Flll <br />Material (Ironclad Materiall. <br />Dear Mr. Keffelew: <br />Pursuant to the approved application for Amendment Number 6 to the subject Permit and Cripple <br />Creek & Victor Gold Mining Company's ("CC&V") commitment number "33" thereto, the <br />following additional information and request for concurrence is presented to the Office of Mined <br />Land Reclamation by CC&V. Commitment number 33 reads: <br />33. 'Design and sper~cation changes, as defined in Secrion 6.OS of the CQr! plan and <br />techtllcal spec(Jicatlo»s, shall only be made wirl: wr)trett agreement oJ'tlle OMLR.' <br />The purpose of this letter is to document the proposed Technical Specification modification that <br />will allow minimal oversize material to be included in the soil liner fill (derived from the <br />Ironclad Vat Leach Material). The modification is necessitated to facilitate processing of the soil <br />liner fill. As you know, a few samples of the Ironclad material that were s,:nt through a pug <br />mill, exhibited, in the recent past, some oversize malarial. Because the ]ronclad materials <br />contain a significant portion of medium plasticity clay that is near optimum moisture content, <br />it has proven impossible to use a screen that contains openings smaller ltan 3 inch in the <br />screening plant to remove oversize pieces. Further, in the process of initilding mixing with <br />calcium hypochlorite (to reduce cyanide), we have found that the pug mill is nc~t suitable because <br />of the few oversize rocks and have therefore switched to a screening plant, but also with a 3" <br />screen. However, as we note below, only one sample recovered from the screening plant <br />equippeA with the 3 inch screen has contained any material lazger than ilk inch and only two <br />of nine samples from various processes (this one being of screened material) has shown any <br />portion greater than 11A inch (it was 33 percent of sample and was one piec,: -further, it was <br />