The Other Minerals of Mt. Diablo
January 2000 by Richard H. Peterson, PhDAlthough it is now known that Mount Diablo, located in Contra Costa County in the East Bay region of the San Francisco Bay Area, was the site of the largest coal mining operation in the state during the last half of the 19th century... this majestic focal point... also was the source of other minerals.
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Even as late as 1906, Delamar was second only to Tonopah and Goldfield in production outshining many better known areas. Since the first discoveries, more than 700,000 ounces of gold have been produced from the mines here.
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The most commonly asked question in metal detecting is, “Which metal detector should I get?” People worry a lot about not getting the right machine. They do not want to waste their money and their time with the wrong metal detector.
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The Bawl Mill • Over the Divide • Our Readers Say • Letter from the Editor to our Readers and Advertisers • Administration Considers Bypassing Congress • First Woman to Draw Mining Pension • Small Mine Selective Blasting • Mohave Mountain Placers, Arizona • High Court to Reconsider Wilderness Water Rights • Sixteen to One Takes on MSHA • Picks & Pans: Gold Mining on Joie Osgood Ranch • Gold • Company Notes • Millie's Tailings • Placer PGMs in Alaska • Mogollon—New Mexico's Remote Gold Camp • ICMJ 9th Annual Photo Contest Results • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices • Looking Back