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History & Geology

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Geology and stories from the past

A New Look at Old Mines


Exploration companies are actively looking for properties with profitable potential, even if the ground was once cast off as too low in grade to be economically viable. This is especially true in states that are reasonably friendly toward...

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.

Eastern Arizona: Gold and Base Metal Deposits Part II


In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.
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Prospecting With The Help of Fluvial Geomorphology


Quiz yourself about the stream in figure 5. Based on your previous knowledge of where gold is found in a stream and in this article, where do you think you will find the most gold?

Eastern Arizona: Gold and Base Metal Deposits—Part I


Arizona is well-known for its copper-gold porphyries and massive base metal-gold sulfide deposits such that primary gold deposits in the state are often overshadowed.

The Downieville Gold District


Many locals are just waiting for California to allow dredging once more, especially with the current gold prices. There are still plenty of good opportunities for prospectors in this area, just as it has been for so many years.
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Detecting for Gold in Australia—The Kimberley Trip


The hair stood up on the back of my neck when I saw this, especially the nice patches of wash in the bottoms of the gullies, a sure sign of an auriferous source being nearby.

Know Your District


We have to remember that the earliest miners were not geologists, but came from a variety of backgrounds. Their survival depended on finding enough gold so they worked hard and adapted to whatever challenges these new areas presented.

Undiscovered Placer Deposits in Alaska


These conditions don’t just apply to Alaska and the Yukon; they apply to western Canada and even to the mountainous western United States.
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Gold of Plumas County


Plumas County has a rich heritage of gold mining, much of it from placer deposits that can still be searched and panned today. Being at the far northern end of California’s famed Mother Lode, it is quite often overlooked by those searching for gold today—really a well-kept secret after all of these years!

Prospecting for Nickel Deposits


The periodic exploration efforts for nickel during periods of high prices have been sporadic and incomplete. There is a role for the prospector and geologist in searching laterites potentially rich in nickel and mafic igneous bodies that may be rich in nickel.

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