Gravelly Valley
Past ProducerSurface-UndergroundUSGS MRDS
Location
| State | California |
| County | Lake |
| Coordinates | 39.44627, -122.97829 |
Commodities
| Tertiary | Silica, Manganese |
Mine Details
| Status | Past Producer |
| Type | Surface-Underground |
| First Production | 1942 |
| Discovery Year | 1918 |
| Data Source | USGS MRDS |
| Source ID | 10139161 |