2012-02-28_REVISION - M1980244 (65)

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Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design 4.2 Site Layout The design and layout of the VLF were developed to achieve several key objectives. The first objective included providing a geotechnically- stable layout, such that acceptable slope stability factors of safety (FOS) could be achieved. The second objective involved developing an effective remediation program for the underground workings located within the VLF footprint area. The third objective included providing adequate capacity for ore reserves. 4.3 Staged Construction The engineering designs contained in this document are based on the best information currently available, and provide a detailed description of the project features associated with the VLF. Because construction will be implemented over many years, it is anticipated that additional information may need to be submitted to the OMLR prior to construction of certain project components. In those instances where the submittal of further information is warranted, CC &V will provide issued - for - construction (IFC) drawings and appropriate supporting documentation (e.g., calculations, narrative explanations, etc.) to the OMLR containing design details and changes that are based on site - specific conditions and constraints. Comparable to previous permitting and approval activities, submittal of the IFC drawings and any supporting information is not expected to require new approvals, but is intended solely to ensure that the OMLR is aware of the phased implementation of the construction activities. It is recognized that certain design changes may require OMLR review and approval as more detailed information is provided pursuant to approval of this facility. The VLF will likely be constructed in two stages, Phase 1 (refer to Drawing A205) and Phase 2 (refer to Drawing A210). The limits of geomembrane liner for each phase may vary somewhat from that contained in the design drawings presented herein. For instance, CC &V may elect to install geomembrane liner to the inside limits of the haul road for Phase 1 based on constructability (currently shown to the outside limits of the haul road). The ultimate construction limits are shown on Drawing A100. The actual limits may vary from those shown. Development of phases will be dependent on a number of factors including, but not limited to, climatic conditions, mine sequencing, contractor availability, and other related factors. 4.4 PSSA Embankment During the initial construction of the VLF, the PSSA embankment will be constructed. The embankment will serve multiple purposes, including providing containment for the PSSA, location for ADR building relocation and supporting structures, and facilitate relocation of State Highway 67, as illustrated in Drawing A207. The PSSA earthen embankment has the following dimensions: • Average height of 215 feet; Project No.: 74201125G0 Page 18 1 September 2011 ameC°