Keystone
Past ProducerMercuryUSGS MRDS
Location
| State | California |
| County | San Luis Obispo |
| Coordinates | 35.65940, -121.07571 |
Commodities
| Primary | Mercury |
Mine Details
| Status | Past Producer |
| Discovery Year | 1875 |
| Data Source | USGS MRDS |
| Source ID | 10040899 |
| State | California |
| County | San Luis Obispo |
| Coordinates | 35.65940, -121.07571 |
| Primary | Mercury |
| Status | Past Producer |
| Discovery Year | 1875 |
| Data Source | USGS MRDS |
| Source ID | 10040899 |