No abstract

The Goldfield district is an epithermal prec1ous metal depos1t of the quartz-alunrte type. Gold ore bod1es are assoc1ated spatially and temporally wrth a calc-alkalic volcanic center of earty M1ocene age Flows, tuffs, and brecc1as of this center overtap a small caldera of Oligocene age SiliCIC domes of Oligocene age and porphyritiC rhyodacite domes of earty M1ocene age both 1ntrude the caldera nng-fracture zone. Most of the rocks in and around the caldera are hydrothermally altered, and gold ore bod1es are clustered along the caldera marg1n, hosted both by Oligocene rocks cut by the ring-fracture zone and M1ocene rocks that 1ntrude or overtle the ring-fracture zone. The ore bodies formed at relatively shallow depths from meteonc water at about 200 to 300 °C.The d1strict has produced more than 4 2 mllhon ounces (130 metnc tons) of gold and 1 45 million ounces (45 metnc tons) of sliver, mostly before Wortd War I, and has modest reserves and inferred resources of gold M1nor intermittent production continues.

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The number or large sawmills (mills sawing more than 5 million board feet/year) decreased from 38 to 32 mills between 999 and 2003 (Table ). The total roundwood receipts for large mills dropped 6 percent (Table 2).

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