Construction of Phase IV A & B expansion to the valley leach pad. The project included 2,035,000 cubic yards of site grading, 320,000 cubic yards of rock excavation, 79,500 linear feet of under-drain and leachate collection pipe, 1,150,000 tons of drain and cover rock processing and placement, and construction of 6,150,000 square feet of clay liner and 80 and 100-mil LLDPE liner. Construction of the Phase IV-C Valley Leach Pad included 15,000 cubic yards of site grading, 10,000 linear feet of under-drain and leachate collection pipe, 500,000 tons of drain and cover rock processing and placement, and 2,720,000 square feet of clay and 80 and 100-mil LLDPE liner.

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