There is the Burro Schmidt mining tunnel North East of the store. But be sure to bring good flashlights, even in the middle of the day...
There are some abandoned mines from the Gold Rush Era in the area but I certainly wouldn't enter on foot let alone a motocross vehicle.
Be vary careful with caves or mines in this area. Not advisable.
I've never seen any. There are a few mines around but I would not go into any
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