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History & Geology

Colorado Uranium Mining in the 1950s Boom

You can learn a lot from a small mining operation because you have to become proficient in every job. Soon I was preparing fuses, placing powder (dynamite) and learning the ins and outs of drilling and blasting.

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Gold in Quartz


Because quartz and gold may be deposited together across a considerable range of temperatures, not all quartz veins are the same, and there are several different types of gold-quartz deposits.

The Batteries Metal Rush


There is a major change coming in the economy of the world and now is the time for prospectors and miners to grab a ticket and get on board.

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.

Enrichment of Mineral Deposits by Weathering—Part I


The exact minerals formed in the concentrated supergene deposits depends much on the type of country rock around the deposit and the chemistry of the deposit itself, but if conditions are right, this process will form some rich patches of bonanza ore, in some places valued at thousands of dollars to the ton.

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.

Benches and Fossil Placers


Unfortunately for us mortal humans, we have a poor perspective on geologic time. When we look at a landscape such as a stream valley, we see it only in two, or at the most, three dimensions. We have poor comprehension of the valley’s fourth and most important dimension—time.

How to Recognize Hard Rock Gold Ores


I regularly get inquiries along the line of: “Hey, I found this rock, and I think it might be gold ore. How can I tell?” Prospectors are always on the lookout for gold-bearing rocks that may be the source of any nearby placer gold.

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The Bawl Mill   • Ask The Experts - Info on Santa Cruz beach placers?   • Ask The Experts - Detectors and flour gold   • Ask The Experts - Why is the gold in these clays?   • Ask The Experts - Can you explain colloidal gold?   • Ask The Experts - Where did this kimberlite come from?   • Ask The Experts - Can gold particles combine to form a nugget?   • Placer Gold Deposits in the Western States   • Evaluating Gold Recovery with Mass Balance Calculations   • Clues for Detecting Ancient River Channels and Flats   • What Is Your Grade?   • State of Idaho Looks to Invest in Gold and Silver   • Drywashing for Desert Gold—Part II   • Decoding Dredge Capacity   • I Just Tripped Over A Nugget   • Melman on Gold & Silver   • Mining Stock Quotes and Mineral & Metal Prices

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