GENERAL38988

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 7/29/1994
• Doc Name: CRESSON PROJECT PN M-80-244 COMMITMENT 33 SPECIFICATIONS GRADATION SPECIFICATION MODIFICATION OF SOI
• From: CRIPPLE CREEK & VICTOR GOLD MINING CO
• To: DMG
• Media Type: D
• Archive: No

• • III IIIIIIIIIIIII Ill
999
~~ Cripple Creek & Victor Gold Mining Company
A Joint Venture -Pikes Peek Mining Company, Manager
(~ Q 7 Ope~ationa Oltice Englewood Office
!`~7'T`V P.O. Box 191, 2755 State Highway 67 5251 DTC Parkway, Suite 700, Englewood
Victor, Colorado 80860 Colorado 80111
[phone] • FAX [phone] {303) 889-0700 • FAX [phone]
July 22, 1994
SENT BY FACS]MILE -COPY FOLLOWS BY MAIL
Mr. Berhan Keffelew
Environmental Protection Specialist
Colorado Department of Natural Resources
Division of Mines and Geology
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203
RF, ;~, t~~ ~,,
Sul 2 s 1994

Reference: Cresson Project: Permit Number M-80-244: Commitment Number "33"
(Scecificationsl -Gradation Specification Modification of the Soil Liner Fill
Material (Ironclad Material
Dear Mr. Keffelew:
Pursuant to the approved application for Amendment Number 6 to the subject Fermit and Cripple
Creek & Victor Gold Mining Company's ("CC&V") commitment number "33" thereto, the
following additional information and request for concurrence is presented to the Office of Mined
Land Reclamation by CC&V. Commitment number 33 reads:
3.?. "Design and specification changes, as defined in Section 6.05 of the CQA plan and
technical specifications, shall only be made with written agreement o~'the OMLR. "
The purpose of this letter is to document the proposed Technical Specification modification that
will allow minimal oversize material to be included in the soil liner fill (derived from the
Ironclad Vat Leach Material). The modification is necessitated to facilitate processing of the soil
liner fill. As you know, a few samples of the Ironclad material that were sr;nt through a pug
mill, exhibited, in the recent past, some oversize material. Because the Ironclad materials
contain a significant portion of medium plasticity clay that is near optimum moisture content,
it has proven impossible to use a screen that contains openings smaller than 3 inch in the
screening plant to remove oversize pieces. Further, in the process of initi;tting mixing with
calcium hypochlorite (to reduce cyanide), we have found that the pug mill is nr~t suitable because
of the few oversize rocks and have therefore switched to a screening plant, Itut also with a 3"
screen. However, as we note below, only one sample recovered from the screening plant
equipped with the 3 inch screen has contained any material larger than It/z inch and only two
of nine samp]es from various processes (this one being of screened material) has shown any
portion greater than 1 t/z inch (it was 3.3 percent of sample and was one pied; -further, it was