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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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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.

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.

Prospecting for Silver Deposits


In some ways, silver is the forgotten precious metal because it straddles both the world of precious metals and jewelry, while having many important  industrial applications like a base metal. The price of silver reflects both the precious metal investment demand as well as the industrial demand.

It Pays to Know Your Bedrock


On our last trip, we brought ropes and went down the first waterfall forty vertical feet, only to be confronted by a second, sixty-foot-high, overhanging waterfall that emptied into a slot canyon.

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.

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 Batteries Metal Rush


There is a major change coming in the economy of the world and now is the time for prospectors and miners to grab a ticket and get on board.

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