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History & Geology

"Gold Rush: Alaska" in the Porcupine Mining District

Honestly, I don’t believe it is likely there would be a glory hole where they described one at the bottom of the waterfall because plunging water with enough energy to scour out a large hole in bedrock would have the scouring ability to grind up and...

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The Many Facets of Iron


I’ve been fascinated by iron minerals for many years. So let’s take a look at this very interesting and colorful element.

The Seven Troughs Mining District


The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.

Prospecting With The Help of Fluvial Geomorphology


Quiz yourself about the stream in figure 5. Based on your previous knowledge of where gold is found in a stream and in this article, where do you think you will find the most gold?

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.

The Geology of Diamond Deposits


New theories have been developed and they may lead to new discoveries and give prospectors some new insight on where to look for diamonds.

Ask The Experts


Q: Is there a correlation between fault zones and mineralization of economic metals?

Gold Depositiion and Gradients of Placer Streams—Part II


The steeper the gradient is, the more potential erosive power to move gold and other bedload sediments, and the more power to remove obstacles to flow.

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