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Caldecott Tunnel, western entrance
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Driving to Black Diamond Mines Regional Preserve
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Driving to Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Historical marker: Mt Diablo Coal Field
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Greathouse Portal
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Greathouse Room
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Greathouse Room
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Hike I mostly took in Black Diamond Mines RP
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Chaparral Loop Trail
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Miner's Trail
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Miner's Trail
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Miner's Trail
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Central Mine (formerly)
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Black Diamond Mines Regional Preserve
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Black Diamond Mines Regional Preserve
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Sign to Oil Canyon Trail
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Oil Canyon Trail
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Electrical tower on Oil Canyon Trail
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Oil Canyon Trail
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Oil Canyon Trail
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Oil Canyon Trail
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Oil Canyon Trail
