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INTRODUCTION Located about 80 km (50 miles) northeast of Eureka and

Located about 80 km (50 miles) northeast of Eureka and
121 km (75 miles) southeast of Elko (Fig. 1), the Bald Moun-
tain district is situated in the southernmost part of the Ruby
Range, a metamorphic core complex (Rigby, 1960). Histori-
cally, the Bald Mountain district has produced silver, antimony,
lead, tungsten, copper and placer gold (Hitchborn, 1996). Cur-
rently, this district is being mined as a series of open pits to
exploit fissure-hosted and disseminated gold. These deposits
have some geochemical characteristics of Carlin-type gold
deposits, such as elevated levels of thallium, arsenic, and bar-
ium in addition to gold. However, they also have characteristics
that are not clearly Carlin-type, such as elevated bismuth val-
ues. It is not clear what kind of deposit Bald Mountain is, but it
does represent fossil hydrothermal systems of some sort that
ultimately deposited gold. The study described here was initi-
ated to determine if low-temperature thermochronology and
stable isotope techniques could be used to identify the location
of thermal anomalies and fluid flow at Bald Mountain.
Thermal and chemical profiling of the


Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno


Collections: Geosciences