Location: Mineral Co., T5N, R28E, Aurora Mining District
Aurora, a historic bonanza gold district in Nevada offers several attractive opportunities for modern-day bonanza gold discoveries. Aurora began as a high-grade, underground district that in the middle 1800’s and early 1900’s produced over a million ounces of gold. By contrast, the modern, low-grade open pit operations peripheral to the earlier mined outcropping bonanzas, have produced only about 500,000 ounces of gold. In all its history, the district has produced entirely from outcropping ore bodies, and the district has seen no exploration for non-outcropping orebodies. Applying modern epithermal-vein concepts to the available data, Ely Gold has recently identified several promising bonanza exploration targets.
The Aurora project in the historic Aurora district where historic production was about 1.8 million ounces of gold in bonanza grade veins. The district is located in the prolific Walker Lane structural/mineral belt. The mineralization is in low sulfidation epithermal, quartz-adularia veins hosted by east-northeast, north-south, and east-west trending structures in Tertiary andesite, latite and rhyolite. The productive interval in the district appears to be dipping to the north.
The project covers mainly the northwest portion of the district where east-northeast and north-south structures are silicified and opalized. The exposed rocks in this area are high in the hydrothermal system, therefore the entire productive interval has been preserved.
After taking into account the northerly dipping ore horizon, it becomes apparent that the main Aurora District most likely continues to the north in the form of blind orebodies. Adding to this attraction is the northerly projection of what history has proven to be a major, district-scale ore control, the NS fault system, and the northeasterly projection of a demonstrated gold-bearing structure, the Sawtooth vein. The projected intersection of these two structures beneath post mineral cover provides one concrete example of a buried high-grade target north of the main District. Additional work will doubtless identify additional, more subtle targets. In keeping with the rather subtle surface expressions typical of the higher levels of epithermal vein systems, premineral rhyolitic tuffs located in this area expose abundant chalcedonic to quartz veinlets moderately to weakly anomalous in gold. This target area requires some finalizing fieldwork to locate specific indications of underlying structures, followed by drilling. Intriguingly, virtually no drilling has been carried out in this area.
Important geologic features that attest to the Properties potential include:
Veins are accommodating NE-trending riedel faults between major NNW-trending faults related to Basin and Range and Walker Lane faulting.
Shallow relay veins link between steep NE-trending veins and faults, ore shoots exist at the intersection.
The epithermal system is shallower to the north as a result of a 15-20 degree northwest dip in the region.
Generative targets of hydrothermal breccia occur within the North Mill and Sawtooth areas through the upper section of steam heat white clay altered rhyolite, additional hydrothermal breccia identification is warranted and may lead to new vein discoveries.
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