Lost California Treasure

Nevada County Treasure Map

Nevada County California treasure-history records: lost mines, source links, land-status warnings, field notes, and interactive map links.

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2 Nevada County Records

  • Empire Mine State Historic Park lost mine · 10791 E Empire St, Grass Valley, Nevada County · High probability

    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.

  • Malakoff Diggins State Historic Park lost mine · North Bloomfield, Nevada County · High probability

    California's largest hydraulic gold mining operation. Blasted away entire hillsides, excavating over 41 million cubic yards of earth and carving out a massive canyon. The resulting environmental devastation led to the.