Tag Archives: East Bay Regional Parks

Exploring the East Bay; the ghosts of old coal miners haunt Black Diamond Mines Regional Preserve north of Mt. Diablo

Ghosts of old coal miners haunt the East Bay foothills! From the 1850s to early 1900s, the largest coal mining area in California was the Black Diamond Mines District just northeast of Mount Diablo. The almost 4 million tons of coal (“black diamonds”) were the product of over 900 miners, many of them immigrants from […]

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