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The Other Minerals of Mt. Diablo

Although 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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Secrets of Successful Prospecting


Winter is the time for research, and if you haven’t already done some research to find new places to prospect, now is the time to cram in some last minute research before the good weather arrives.

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Gold in Michigan


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