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History & Geology

Gold Refining In The Ancient World

One thing that stood out for me is that Agricola was very specific about the type of metal or wood in the implements and vessels that were to be used.

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The Verde Copper-Gold-Silver-Zinc District, Jerome, Arizona


When I was a student in the College of Mines at the University of Utah, the Verde district was used as an exploration model for “submarine volcanogenic massive sulfide deposits.” So I looked forward to visiting this district and the town of Jerome in central Arizona in the spring of 2012.

The Birimian Greenstone Belts of West Africa


A few years ago I had a tremendous opportunity to visit Australia and hunt for gold there. The geology of the gold deposits there was somewhat different from what I was used to here in the US. I learned a lot about greenstone belt gold deposits while prospecting them in person, and it was an amazing trip.

What Are Those Rocks In My Pan?


The placer mineral identification key is designed to answer this question. It attempts to recognize all the minerals in your gold pan concentrates.

Prospecting Homonyms


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

Sixteen to One Gold Mine: Going Underground - Pt II


We descended hunched over, down a long, steep, wooden staircase to the 1,000-level.

Alaska: Kodiak Islands Mineral Resources


The fresh material is worked and concentrated by the waves on the flat, wide beach platform. The waves wash away the lighter minerals, leaving the heavies near the bluffs and in depressions on the beach.

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.

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