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History & Geology

Eastern Arizona: Gold and Base Metal Deposits—Part I

Arizona is well-known for its copper-gold porphyries and massive base metal-gold sulfide deposits such that primary gold deposits in the state are often overshadowed.

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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.

Sierra County Gold—Part II


...we will continue our examination of the rich streams and mining districts, and then take a look at some of the big nuggets that have been found here.

Yesterday's Gold—Today's Mine


It would seem that we are often indeed destined to repeat history. In terms of gold discovery, even with all the advancements that have been made over the years, it seems we are once again on the cusp of returning to the 1800s world of gold mining. Even as you read this, a new gold rush is taking place in a sleepy little town in South Carolina.

The Downieville Gold District


Many locals are just waiting for California to allow dredging once more, especially with the current gold prices. There are still plenty of good opportunities for prospectors in this area, just as it has been for so many years.

Diary of a Diamond Prospector


I couldn’t wait to get started. With no field budget, an assay budget of $100/year, a 1975-Ford Bronco that was a road hazard, a gas card, a topo map and full support of the director, I headed to the State Line district near Tie Siding along US Highway 287 to begin mapping kimberlite.

Strategic Metals—Part II


There are literally thousands of abandoned wasterock and ore dumps that dot the United States that could hold many tones of strategic metals.

The Heavy Minerals in Your Concentrates


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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