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History & Geology

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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Understanding and Prospecting Benches


The most obvious benches are usually near the valley floor, but they can be thousands of feet above the valley floor. Since benches were made by streams, they can contain placer deposits.

Gold Refining In The Ancient World


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Eastern Arizona: Gold and Base Metal Deposits—Part I


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Simple Rules of Gold Geology: Comparing Epithermal and Mesothermal Deposits


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The Geology of Diamond Deposits


New theories have been developed and they may lead to new discoveries and give prospectors some new insight on where to look for diamonds.

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