Crushed, Broken Traprock Mines in California
2Total Sites
2Active
Crushed, Broken Traprock Mining in California
California has 2 crushed, broken traprock-related mine and mineral deposit locations recorded in federal databases. Of these, 2 are currently active operations. Data comes from the USGS Mineral Resources Data System and MSHA Mine Safety and Health Administration records.
By County
| County | Sites |
|---|---|
| San Mateo County | 1 |
| Sonoma County | 1 |
Crushed, Broken Traprock Mines
| Mine | County | Type | Status |
|---|---|---|---|
| Blue Rock Quarry | Sonoma | Surface | Active |
| Langley Hill Quarry | San Mateo | Surface | Active |
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