The main shaft of the Empire Mine (oldest and richest hard rock mine in CA), Empire Mine State Historic Park, Grass Valley, Gold Country (Highway 49), California
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yellow Mother Lode historic landmark history Empire Mine mine shaft mining color United States of America pioneer work USA goldrush historic business historical landmark productivity North America industry colour gold Gold Country Highway 49 United States pioneers Grass Valley California gold mining gold rush historic landmarks historic site historic sites mine
- Contained in galleries
- Environmental, Historic Sites
