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.

Critical Minerals: Gold

August 2011
A few quick calculations show that approximately 11 tons of gold are lost each year just in the manufacture of new cell phones.

Prospecting Homonyms

April 2012
Three homonyms come to mind when I think of gemstones, gold and vegetables: carrot, carat and karat. Let’s look at carrot first.

Over the Divide: John A. Miscovich

October 2014
Mining “giant” John A. Miscovich died August 22, 2014, at the age of 96. He was the well-known inventor of the “Intelligiant” water cannon.

Eastern Arizona: Gold and Base Metal Deposits Part II

March 2011
In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.

Gemstones to Die For

November 2014
Some gems can potentially poison you, make you sterile and even make you forget who you are.

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.

Gold of the Iditarod Mining District, Alaska

March 2014
It was the middle of winter and the valley was covered in snow, making prospecting a matter of sinking shafts in the ground.

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