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• PROPOSED 1994 WEST RIDGE <br />WASTE PILE MODIFICATIONS <br />CYPRUS ORCHARD VALLEY MINE <br />PAONIA, COLORADO <br />This design document has been prepared by BUKOVANSKY ASSOCIATES, <br />LTD., in cooperation with HYDRO-TRIAD, LTD., in March, 1994. <br />1.0 INTRODUCTION <br />Cyprus Orchard Valley Mine in Paonia, Colorado, (Cyprus) has been <br />operating a waste pile known as the West Ridge waste pile. This <br />waste pile is located on a north-south trending, natural ridge, <br />south of the mine facilities. The waste pile was designed by <br />Colorado Westmoreland, Inc. and their consultant, Geo-Hydro <br />Consulting, Inc., in 1982 and has been permitted and operated <br />since 1983 until present. <br />At present, the waste pile footprint differs slightly from the <br />original design. The waste pile configuration, slopes, surface <br />drainage, access and construction methods are in conformance with <br />• the original design. <br />Cyprus intends to modify slightly the original design within the <br />not yet developed, north part of the West Ridge waste pile. The <br />purpose of this modification is to increase slightly the width of <br />the pile at the north end to achieve an increased storage volume <br />of this pile while maintaining most of the other parameters of <br />the original design. <br />Extending the width of the north, not yet developed part of the <br />pile requires the pile development across two minor periphery, <br />side drainages, one at the east and one at the west end of the <br />pile. Both these drainages start immediately south (below) the <br />crushing and screening level fill. The drainage on the west side <br />is parallel with the pile west border while the drainage on the <br />east side is a short drainage to the confluence with the main <br />drainage that separates the west and east ridges. <br />The footprint of the originally designed waste pile and of the <br />proposed design modifications is shown in Figure 1. <br />2.0 ORIGINAL WEST RIDGE WASTE PILE DESIGN <br />• In general, the original design called for a waste pile located <br />beyond all drainages that form the boundaries of the west ridge <br />1 <br />