History & Geology
PGMs in the United States
August 1999 by Edgar B. Heylmun, PhD
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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.
Downieville: Another Gold Rush Favorite
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.
Diary of a Diamond Prospector
![](http://www.icmj.com/userfiles/images/201704/27-diary-diamond-prospector-TOC.jpg)
The Miner’s Switchback
Common thought is the switchback slows the velocity of the rushing water and gold drops out from the cut bank to a fill gravel bar within or below the switchback. I am not going to disregard that model; however, I hope to improve upon it.
Exploring and Mining for Uranium
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Placer Gold Deposits of New Mexico
While a large number of locations have yielded some placer gold, most of the state’s placer production has come from a few productive districts.
California's Mother Lode Quartz Veins
![](http://www.icmj.com/userfiles/images/201505/8-mother_lode_quartz.jpg)
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The Bawl Mill
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• Company Notes
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• Gold Fever
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• Looking Back
• 1999 National Mining Hall of Fame Inductees
• Melman on Gold & Silver
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