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Historic Mining at Mount Diablo, CA
September 1999 by Richard H. Peterson, PhD
Located in Contra Costa County in the East Bay region of the San Francisco Bay Area, Mount Diablo was the site of the largest coal mining operation in the state in the last half of the nineteenth century. The northern foothills of the mountain produced nearly four million tons of coal.Green Valley's Fine Gold Patch
Once across, I panned a couple of spots around some old grass roots and the fine gold was amazingly heavy. Every pan I ran after that had lots of color.
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In Pursuit of Gold and Silver in the Sierra Madres—Establishing a Mining Company in Mexico

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The Bawl Mill
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