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History & Geology

All About Pyrite

Most prospectors learn early that pyrite is fool's gold...but the truth is it can be an excellent indicator mineral for gold and in many cases does contain small amounts of gold.

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Fabulous Florence—The Golden Town of Idaho


In September 1861, on a round-about prospecting journey homeward, five California gold miners discovered gold in the area now called Florence. While watering the horses, one of the men noticed a golden color on a piece of slate bedrock in the stream...

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.

Ancient River Channels of Trinity County


Trinity County is located in the far northwest corner of California and stirs up many different memories for those who have been there.

The Heavy Minerals in Your Concentrates


The fact that mineral deposits can contribute specific types of heavy minerals is why the analysis of the heavy mineral concentrates in the streams of an area can be an important prospecting technique for finding undiscovered mineral deposits.

Gold Refining In The Ancient World


One thing that stood out for me is that Agricola was very specific about the type of metal or wood in the implements and vessels that were to be used.

Gold Placers of Southern California


I grew up in Southern California, and found my first nugget there, so I know my way around. Because there is good gold there, I thought it might be helpful to take a look at the many placer gold opportunities found in the southern part of the state.

Strategic Metals—Part I


A bill was introduced and passed by the House of Representatives earlier this year that should make the exploration and opening of a mining operation faster and easier.

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