History & Geology
Las Médulas—The Gem of the Roman Gold Mines
July 2018 by Alan J. Chenworth
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.
All About Quartz—Part II

Prospecting for Diamonds
Let’s take a look at diamonds and diamond mining and see how they form, how they are used beyond just jewelry, and what leads geologists to find diamond deposits.
Downieville: Another Gold Rush Favorite
I didn’t know what to expect because the area we were working was not close to the water, but we were pleasantly surprised when we began to pan out some nice flakes and a few pickers.
Prospecting for Nickel Deposits

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.
Prospecting for Copper Ores—Part II
Copper is a critically important metal that we need to run our modern electronic society, and the long term outlook for this metal is for a steady increase in price.
The Heavy Minerals in Your Concentrates

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