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1 <br />t <br />' Darrel L. Buffington, P.E. Heap Leach Design ICont'd1 <br />Water Retention and Tailings Dams <br />' McCoy Projsct, Lander County, Nevada. Geotechnical and hydrologic investigations and design of <br />three 1.04 million square foot peomembrane lined heap leach pads, a 3 million gallon process solution <br />' containment pond and a 2.5 million gallon stormwater retention pond. Project included evaluation of <br />potentially hydrocollapsing soils on liner system. Construction consultation was provided as part of <br />construction management services. <br />Rawhide Project, Mineral County, Nevada. Geotechnical and hydrologic investigation and design <br />development studies were conducted fora 13.4 million square foot leach pad to be used in processing <br />about 30 million tons of ore over a 15 year mine life. Project technical issues included developing <br />' procedures to construct the leach pad aver a foundation which varied from bedrock to up to 15 feet <br />of coarse rockfill. Open pits and shafts occurring within the pad area required closure in such a manner <br />as to minimize future subsidence. <br />' East Robinson Project, White Pine County, Nevada. A review evaluation was made on the behalf of <br />amine property owner of a gold heap leaching operation proposed by the mine operator. The purpose <br />' of the review was to assess the environmental liability exposure of the property owner associated with <br />the operation and to develop cost estimates to remediate potential operational occurrences which <br />would result in contaminant release. <br />' Brewer Gold Facility, Jefferson, South Carolina. Design was completed of a 600,000 square foot <br />reusable asphalt lined heap leach pad and associated solution and storm channels to route flows from <br />the pad to process facilities and solution ponds which were designed by others. The project also <br />' included review of construction quality assurance testing. <br />Water Retention and Tailings Dams: <br />' Mr. Buffington has gained broad based experience in the evaluation and design of water and mine <br />waste retention dams. Specific technical areas include: <br />' Site characterization with evaluation of strength, deformation and hydraulic properties <br />of foundation materials. <br />' Settlement analysis of dams with evaluation of outlet works joint extension <br />requirements. <br />Slope stability analysis under static and dynamic conditions, with permanent <br />' deformation analysis. <br />Seepage analysis and pore pressure prediction. <br />' Design of internal drainage provisions and filter zones for control of seepage forces. <br />1 <br />J <br /> <br />