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Home / Mojave Preserve and Desert bikepacking trips / 2008: Mojave National Preserve Mountain-Bike Camping and Hike / Day 5: Afternoon hike to an old mine site in the Bighorn Basin hills, Mojave National Preserve /
The upper tunnel isn't carved very deeply into the hillside
It leads to a shaft with a ladder that presumably drops down to the lower tunnel; I didn't check to see where it goes.