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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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Ask The Experts


• Can I get advice on a hard rock property in Calaveras County, California?

Pacific Island Gov'ts Focus on Undersea Mining


Pacific Island nations have started devising regulatory laws to help create a new industry in this near-resourceless region: mining the sea floor.

Colorado Court Rules on Cyanide Ban


The Colorado state Court of Appeals ruled that counties have the authority to ban the use of cyanide in gold mining.

Ask the Experts: More suggestions for dealing with metallic trash....


Q: Thanks for the great article in the recent ICMJ [“Metallic Trash—Scourge of the Prospector,” July 2012]...

Estimating Gold Values in Placer Gravels


The single most important question to be answered when evaluating a placer deposit is: “How much is it worth?” Accurate sampling of placer gravels is essential to obtain a reasonable estimate of the total gold values contained in the deposit.

Looking Back


Excerpts from California Mining Journal, our original title, published 50 years ago this month.

Mining Stock Quotes and Mineral & Metal Prices


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