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.
My first clean-up showed that my efforts were not in vain. There was considerable color with some good-sized nuggets in the riffle trap.
As we traveled through the states of Washington, Oregon, California, Arizona, Nevada, New Mexico and Texas we saw the combination of mining towns in stagnation but otherwise, incredible displays of prosperity.
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It starts out innocently enough…
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