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

July 2013
In our May 2013 issue, we took a look at the mineral quartz, a mineral very commonly associated with gold. However, gold is not the only reason prospectors are interested in quartz. Quartz can also be very valuable as a gemstone

Prospecting for Diamonds

January 2013
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

October 2021

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

November 2010
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.

The Batteries Metal Rush

August 2018

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

July 2012
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

June 2016
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.

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