Abstract
The Gold Quarry mine has developed a large, epithermal, disseminated gold deposit hosted by Paleozoic siliciclastic sediments. The deposit consists of two, easterly tilted, stacked orebodies; an upper structural stockwork and a lower stratabound replacement. Anomalous crustal heat flow associated with Oligocene volcanic rocks appears responsible for the formation of a large hydrothermal system at Gold Quarry. Wallrock alteration and mineral concentration are spatially and temporally associated with this event. Rock alteration types include decalcification, silicification, alunitization, argillization and oxidation. Complex and repeated compressional and extensional tectonic events combined with litho-chemical characteristics of the host sediments to form sites favorable to mineral deposition. A dominant elemental association of AuAsSbHgTl is directly associated with mainstage Oligocene mineralization. A subordinate association of AgPbZnCuNi appears to represent earlier mineralizing events. A continuing deep exploration program has shown that mineralization remains open to the south.
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