Lost California Treasure

Empire Mine State Historic Park

One of the oldest, largest, deepest, and richest hard-rock gold mines in California. Operating for over 106 years from 1850 to 1956, it produced 5.8 million ounces of gold from 367 miles of underground passages, reaching an incline depth of 11,007 feet.

Record typelost mine
Location10791 E Empire St, Grass Valley, Nevada County
Probability indexHigh
Land statusEmpire Mine State Historic Park (Restricted; state park, no artifact gathering)
Research coordinates39.2059, -121.0438
SourceUSGS Mineral Resources Data System (MRDS ID #10061245)

Field Research Notes

Visit the state park to view the massive stamp mill, the historic Bourn Cottage, and the open mine portal. Under state law, all rocks, minerals, and historical relics inside the park boundaries are protected. Mineral prospecting or metal detecting is strictly forbidden within the historic park.

Recommended Gear

Walking shoes, Camera, Light jacket

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