Flagstone Mines in California
30Total Sites
6Active
Flagstone Mining in California
California has 30 flagstone-related mine and mineral deposit locations recorded in federal databases. Of these, 6 are currently active operations. Data comes from the USGS Mineral Resources Data System and MSHA Mine Safety and Health Administration records.
By County
Flagstone Mines
| Mine | County | Type | Status |
|---|---|---|---|
| Blm Rock Pile | Monterey | Surface | Producer |
| Colson Summit Quarry | Santa Barbara | Surface | Producer |
| Freeman and Sondgroth | Marin | Surface | Producer |
| Grieb Ranch Quarry | San Luis Obispo | Surface | Producer |
| Las Cruces Quarry | Santa Barbara | Surface | Producer |
| Signorelli Quarry | Santa Barbara | Surface | Producer |
| Ayers Charles | Amador | Occurrence | |
| Central Supply Co | Santa Cruz | Surface | Unknown |
| Charlton Quarry | Los Angeles | Surface | Past Producer |
| Defante Sandstone Quarry | San Bernardino | Surface | Past Producer |
| Delfante Sandstone | San Bernardino | Surface | Past Producer |
| G B Russell | Siskiyou | Occurrence | |
| G J Alexander | Amador | Occurrence | |
| Kern Develop. Syndicate Quarries | Kern | Surface | Past Producer |
| Late | Calaveras | Occurrence | |
| Mentone Sandstone | San Bernardino | Surface | Past Producer |
| O Neal Sandstone Quarry | Amador | Surface | Past Producer |
| Painted Hill Quarry | Riverside | Surface | Past Producer |
| Salt Springs Dam | Calaveras | Occurrence | |
| Sandstone Occurrence | Riverside | Occurrence | |
| Sandstone Quarry | Riverside | Occurrence | |
| Santa Lucia Quarries, Ltd. | Monterey | Surface | Past Producer |
| Santa Maria Stone Quarry | Santa Barbara | Surface | Past Producer |
| Santa Ynez Canyon Quarry | Los Angeles | Surface | Past Producer |
| Searchlight | San Bernardino | Surface | Prospect |
| Sierra | Monterey | Surface | Past Producer |
| Southern California Sandstone | San Bernardino | Surface | Past Producer |
| Southern Pacific Quarry | Los Angeles | Surface | Past Producer |
| Unnamed Location | Napa | Occurrence | |
| Valley of the Moon | Sonoma | Surface | Past Producer |
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