REV95055

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 1/31/2007
• Doc Name: Submittal
• From: CC&V
• To: DRMS
• Type & Sequence: TR47
• Media Type: D
• Archive: No

colder assocwres Inc.
44 Unton Boulevard. Suite 300
Lakewood, CO USA 80228
Telephone [phone]
Fax [phone]
November 9, 2006
Cripple Creek & Victor Gold Mining Company
100 N. 3rd Street
Victor, Colorado 80860
Attention: Mr. Garv Goodrich, Manaeer, Environmental Resources
~~
Our Ref.: 063-2269
RE: PHASE IVC 2006 VLF SOLUTION COLLECTION MODIFICATIONS
Deaz Gary:
Golder Associates Inc. (Golder) has prepared this letter report for the Cripple Creek & Victor Gold
Mining Company (CC&V) to document enhancements to the solution collection piping system for
Phase Nc of the Valley Leach Facility (VLF) that occurred in 2006. The modifications to the
Phase Nc solution collection system design that were conducted in July, 2006 were a continuation of
enhancements that were conducted in 2005 to augment solution drainage from the pad along the
northwestem edge of the VLF.
Background
CC&V installed additional perforated corrugated polyethylene (PCPE) solution collection pipes along
the northwestern perimeter of Phase Nc of the VLF in October and December of 2005 to augment
solution drainage from the pad along the northwestern edge of the VLF. This work generally
involved the installation of perforated corrugated polyethylene (PCPE) pipe along the northwestern
edge of the VLF. This pipe was added in two sections along the toe of the ore heap where surface
saturation of the Drain Cover Fill (DCF) and minor pooling of leach solutions was observed during
First wetting of the ore. Two sections of the 6-inch diameter PCPE pipe, approximately 375 feet in
length, were added along the toe of the ore to help route leach solutions along the pad edge into the
existing solution collection piping network. The 6-inch PCPE pipe was added by cazefully trenching
(hand-excavating the lower 6 inches) into the DCF, placing the pipe into the trench at the primary
liner, and backfilling the trench with DCF. Two 4-inch tertiary solution collection pipelines were also
extended approximately 125 feet each to augment drainage along the northwestem edge of Phase Nc
to intercept and transport flows away from the azeas where saturation was observed. The tertiary
solution collection pipelines were extended by cazefully trenching (hand-excavating the lower
6 inches) into the DCF, adding extensions to the existing 4-inch tertiary solution collection pipes, and
backfilling with DCF. Goldet inspected the azea during and after installation of the PCPE pipes,
approved the installation, and documented the work in a January 16, 2006 dated letter. The locations
of the PCPE collection pipes that were extended in 2005 aze shown on Figure 1.
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