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The Tangential Impulse Water Wheel in California Gold Mining History—Part I

The modern tangential impulse water wheel, a device best suited for hydroelectric power production where high water head is available, is an ingenious device born in the historic gold mining industry of California in the 19th Century.

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Turning Acid Mine Drainage Into Drinking Water?—Grass Valley Company May Have the Answer


HPT Research recently tested their patented process for treating Acid Mine Drainage (AMD) on thousands of gallons of contaminated water at the Mammoth Mine.

The Bawl Mill


• A hot deal 
• Backword logic punishes Seattle businesses...again

MMAC & PLP Update


We are quite pleased to report there are some courageous miners who have taken the time to learn their rights and have gone back to dredging while knowing they could be unlawfully harassed at any time by law enforcement…

California State & National Gold Panning Championships


By the end of the day Sunday there were a lot of tired panners! By then they could have panned more than 14 times to make it to the end. This was not a picnic! 

The Small Hardrock Mill—Part I


Ore dressing is of prime importance to the operator of a small hardrock gold mine. No, Virginia, ore dressing has nothing to do with dressing in the latest spring dresses, or the stuff that gets forced into the turkey on Thanksgiving. It refers to the method of processing ore to extract the valuable minerals contained in the rock—in the case of this series of articles, gold and silver.

Flat-Fault Gold


Gold and other valuable metals are often deposited in breccia and rubble formed by flat or gently-dipping faults. Such faults are commonly found in areas of crustal stretching caused by the movement of tectonic plates. Flat-faults are especially common in southeast California, southern Arizona, and northern Sonora, Mexico. However, they can be present anywhere that crustal stretching has occurred.

Ask The Experts - Does silicone rubber make a good sluice mat?


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