August 2004
Volume 56    Issue 8

Geologists add value at Newmont's Nevada mines - part two

Mining Engineering , 2004, Vol. 56, No. 8, pp. 13-13
Schutz, Leroy; McEvers, Lloyd; Saderholm, Eric; Clarke, Lori; Trudel, Wayne; Bolin, Charles Lynn


 The Lone Tree Mine is a sediment-hosted, micron gold deposit. It is dominantly situated in the Golconda thrust footwall. The north-south trending Wayne Zone fault controls the highest-grade ores and economically drives the pit depth. Smaller-scale faults with northwest, northeast and north-south strikes localize lower-grade mineralization. Pennsylvanian-Permian Antler sequence carbonate rocks are preferentially mineralized adjacent the Wayne Zone and as breccia fragments within the Wayne Zone. Permian Havallah and Ordovician Valmy Formations form secondary sedimentary host rocks. Pit economics are based on flotation mill ore, with lesser amounts of autoclave mill and run-ofmine leach ores.

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