2012-02-28_REVISION - M1980244 ‎(65)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL 5, Facility Design, Part 1: Table of Contents & Summary
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design
o Appendix C.4 — Primary Solution Collection Pipe Perforation Design
o Appendix C.5 — PSSA Riser Pipe Calculations
o Appendix C.6 — SGOSA Settlement Calculations
o Appendix C.7 — Squaw Gulch VLF PSSA Settlement Calculations
o Appendix C.8 — High Volume Solution Collection System Piping Calculations
o Appendix C.9 — Underdrain Flow Calculations
• Appendix D —
o Appendix
o Appendix
• Appendix E -
o Appendix
o Appendix
• Appendix F —
o Appendix
o Appendix
• Appendix G —
o Appendix G
o Appendix G
• Appendix H —
• Appendix I —
1.1 Project Description
Assessment of Underground Workings
D.1 — Golder Historic Mine Workings Investigation (2007)
D.2 — SWC Squaw Gulch VLF Field Reconnaissance
Squaw Gulch VLF Slope Stability Results
E.1 — Infinite Slope Analysis
E.2 — Global Slope Stability
Surface -Water Hydrology
F.1 — Letter to OMLR Pertaining to SCS Runoff Curve Numbers
F.2 — Output From Surface Water Hydrology Models
Water Balance Modeling
.1 — VLF Water Balance Model
.2 — Meteorological Data and Precipitation Modeling
Technical Specifications
Filtered Tailings Storage Considerations
The existing ore beneficiation facility for the Cresson Project is located approximately
one mile southwest of the proposed Squaw Gulch VLF. CC &V presently uses a
primary and secondary crushing operation to reduce the ore to a nominal % -inch
minus material. A conveyor system is used to transport the crushed ore to a truck
load -out bin (LOB) where haul trucks are then used to place the ore in lifts on the VLF.
Upon completion of Phase 5 of the Cresson Project VLF, there will be approximately
22 million square feet (plan area) of lined and active leach area.
The VLF design for Squaw Gulch will consist of an additional 15 million square feet
(surface area corrected for slope) of lined leach area, located north and west of the
Cresson Project VLF. The VLF provides additional ore storage area (OSA) and a
dedicated internal Pregnant Solution Storage Area (PSSA). Each of these areas will
include composite liner systems. Within the OSA, the composite liner will generally be
comprised of a 12- inch -thick soil liner fill (SLF) with a 1X10 centimeter per second
(cm /s) or lower permeability overlain by an 80 -mil single -sided textured linear low -
density polyethylene (LLDPE) geomembrane, which is overlain by a minimum of two
(2) feet of drain cover fill (DCF). In areas where the final basin slope is steeper than
2.5H:1 V, an 80 -mil double -sided textured LLDPE geomembrane will be substituted for
the 80 -mil single -sided textured LLDPE geomembrane. Within the PSSA, the
composite liner system will consist of a 12- inch -thick SLF with a 1X10 cm /s or lower
permeability, overlain by a 100 -mil single -sided textured LLDPE geomembrane,
Project No.: 74201125G0 Page 2
1 September 2011
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