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Location: 14 km SE from Beatty, Nevada, United States
6363 S Fiddlers Green Circle Suite 1000 Greenwood VillageDenverColorado, United States80111
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The Sterling deposits are characterised as either epithermal deposits (Secret Pass) like the North Bullfrog and Silicon deposits or sediment-hosted deposits (Daisy, Sterling, and SNA). Oxidised gold appears to be controlled by thrust domains and steep northstriking faults in these deposits.Deposit typeFrom oldest to youngest, stratified rock units on the Sterling property range from the Upper Proterozoic to the Ordovician part of the stratigraphic section. The host rocks of the 144 Zone mineralisation span the bottom of the Bonanza King Formation and the top of the Carrara Formation. Miocene quartz latite dykes of the SWNVF occur throughout the Sterling property, but most are along or close to the Reudy Fault zone. They normally range in thickness from 1.5m to about 9m, though some are considerably thicker. Most trend north-south and were probably intruded along faults or fractures. Clay-alteration of the dyke ranges from weak to locally intense. The dykes slightly pre-date the most important hydrothermal activity and gold mineralisation at Sterling.The Daisy deposits are located in the footwall of the Fluorspar Canyon fault where it intersects a prominent north-south fault system that connects with the Reward deposit to the south. Daisy is a sediment-hosted gold deposit.SNA can be described as a Carlin-type deposit hosted within Devonian carbonates in the footwall of the Fluorspar Canyon fault.Mineralisation styleSterling is typical of sediment-hosted, disseminated precious metal deposits. Gold occurs in the rims of microscopic arsenian pyrite grains. Significant mineralisation occurs in:- Gouge or breccia in the Reudy Fault zone and locally along the dyke margin.- Adjacent to the fault (on both sides) in Bonanza King silty dolostone or dolostone, and to a lesser degree in underlying Carrara silty limestone or limestone (proximity to the Reudy Fault is not requisite for mineralisation).- In hydrothermal breccias derived from the above lithologies.Mineralisation characteristicsAt Sterling, pyrite formed during hydrothermal alteration and brecciation resulting from the interaction between gold-bearing solutions rising along high-angle fault feeders from depth, soluble carbonate rocks, and the rheological contrast of ironbearing lithologies. Favourable geological conditions existed at the thrust contact and at the contact between the silty dolostone of the basal Bonanza King and the underlying Carrara limestone. Tertiary quartz dykes in the 144 Zone are also conducive for high-grade gold mineralisation.
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