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.
Gold in Quartz
![](http://www.icmj.com/userfiles/images/201602/18---gold-in-quartz.jpg)
Prospecting for Diamonds in Kimberlite
![](http://www.icmj.com/userfiles/images/201401/TOC-Diamonds.jpg)
The Amazing Mineral Tourmaline
![](http://www.icmj.com/userfiles/images/201312/TOC-tourmaline.jpg)
Exploring Iron Oxide Copper Gold Deposits
The excitement over IOCG deposits began with the discovery of a monster deposit at Olympic Dam in Australia in 1976. The discovery was accidental as the operator was searching for strata-bound copper deposits.
Using Vegetation and Soil Conditions as Prospecting Aids
Wouldn’t it be great if you could know if there is gold in the ground without setting foot on the ground? Well you can, to a certain extent, if you can recognize mined ground from unmined.
Another Prospecting Adventure: Coulterville
What also helped keep Coulterville alive was the fact that the town itself happened to be sitting on top of one of the richest veins in the Mother Lode. The ledge itself was three hundred feet wide.
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