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History & Geology

Greenstone and Gold

Contacts, faults and zones of weak rock are all places that can act as a pipeline to convey gold-bearing fluids, leading to valuable deposits.

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The Seven Troughs Mining District


The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.

Enrichment of Mineral Deposits by Weathering—Part II


While both zinc and lead deposits also are enriched by the surface weathering process, in part two we will look at the enrichment process for copper and also gold deposits, and at the interpretation of leached outcrops to figure how rich the concentrated deposits below them may be.

Indicator Minerals for Gold & Silver


In this article, we’re going to take a look at the minerals that contain gold and silver, and how you as a prospector can identify them in the field.

The Beatty Mining District of Nevada


The Beatty Mining District in south-central Nevada has been one of the most productive Mining Districts in the state, producing millions of ounces of gold together with silver, fluorite, mercury and other valuable minerals.

Gangue Minerals - What Do They Tell Us?


There are a large number of different kinds of gangue minerals, and each of them has its own tale to contribute to the story of the chemistry and geology of a deposit.

Gold Deposition and Gradients of Placer Streams—Part I


When placer miners from the gold rush era began experimenting with the slope of their sluices, they must have pondered the ideal slope for trapping gold in a creek bed too. Logic suggests the same is true for streams...

All the Gold Ever Mined...


If you have been prospecting for any length of time, then you have probably heard something like, “All the gold ever mined would equal a cube 60 feet on each side.”

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