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History & Geology

Strategic Metals—Part II

There are literally thousands of abandoned wasterock and ore dumps that dot the United States that could hold many tones of strategic metals.

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Epithermal Gold and Silver Deposits


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Enrichment of Mineral Deposits by Weathering—Part I


The exact minerals formed in the concentrated supergene deposits depends much on the type of country rock around the deposit and the chemistry of the deposit itself, but if conditions are right, this process will form some rich patches of bonanza ore, in some places valued at thousands of dollars to the ton.

California: The Land of Big Nuggets—Part I


The nugget sat there in plain sight, though it was covered in dirt, while hundreds of people had passed that way every day.

All About Quartz—Part II


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Las Médulas—The Gem of the Roman Gold Mines


This mine was a real wonder of engineering, and the water supply and drifts had to be carefully managed to keep it in operation. In fact, it didn’t close due to lack of gold, but instead closed with the fall of the Roman Empire.

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