Magnesite Mines in California
195Total Sites
25Active
Magnesite Mining in California
California has 195 magnesite-related mine and mineral deposit locations recorded in federal databases. Of these, 25 are currently active operations. Data comes from the USGS Mineral Resources Data System and MSHA Mine Safety and Health Administration records.
The earliest recorded magnesite mine in California is Joyner Bros. in Tulare County, with records dating to 1916.
By County
Magnesite Mines
| Mine | County | Type | Status |
|---|---|---|---|
| Ball | San Bernardino | Producer | |
| Barnaberg Mine | San Luis Obispo | Producer | |
| Beechnut Claim | Madera | Producer | |
| Bradford Ranch | Santa Clara | Producer | |
| Cedar Mountain | Alameda | Producer | |
| Columbia Quarry | Tuolumne | Surface | Producer |
| Fidelity Deposit | Santa Clara | Producer | |
| Fresno Magnesite | Fresno | Producer | |
| Gray Eagle | Tuolumne | Producer | |
| Marine Magnes Div. | San Mateo | Producer | |
| Marine Magnesium Co. Seawater Plant | San Mateo | Brine Operation | Producer |
| Nichols Magnesite Deposit | Riverside | Producer | |
| O:connell Bros. | Santa Clara | Producer | |
| Sampson Magnesite Mine | San Benito | Producer | |
| Security | Santa Clara | Producer | |
| Sonora Plant | Tuolumne | Processing Plant | Producer |
| Southard Ranch | Mendocino | Producer | |
| Sullivan | Placer | Producer | |
| Unnamed Location | Napa | Producer | |
| Western Mine | Santa Clara | Producer | |
| Western Mine | Santa Clara | Producer | |
| Western Mines | Santa Clara | Producer | |
| Westvaco | San Benito | Producer | |
| White Rock | Tuolumne | Producer | |
| White Rock Mine Pope Valley, Walters | Napa | Producer | |
| Adeline Magesite Mine | Tulare | Underground | Past Producer |
| Albertz Ranch Deposit | Sonoma | Surface | Unknown |
| Alcorn and Prindle | Tulare | Surface | Prospect |
| American Magnesium Co. | San Bernardino | Processing Plant | Prospect |
| American Magnesium Mine | San Bernardino | Past Producer | |
| Ashworth Ranch Deposit Big Spring Hill | Mariposa | Occurrence | |
| Avery | Tulare | Underground | Prospect |
| Bald Eagle | Stanislaus | Occurrence | |
| Ball Magnesite Deposit | San Bernardino | Surface-Underground | Prospect |
| Ball Magnesite Mine | San Bernardino | Surface | Past Producer |
| Banta S Camp Deposit | Alameda | Occurrence | |
| Banta's Camp Deposit | Alameda | Occurrence | |
| Bedell Deposit | Monterey | Surface | Prospect |
| Berthenia Mine | Napa | Occurrence | |
| Berthenia Mine | Napa | Surface-Underground | Occurrence |
| Big Spring Hill | Mariposa | Occurrence | |
| Bissell Magnesite Deposit | Kern | Surface-Underground | Past Producer |
| Blue Crystal Magnesite Group | Tulare | Surface-Underground | Past Producer |
| Bolam and Pinger | Tulare | Surface-Underground | Prospect |
| Bowery Bar | Tuolumne | Offshore | Prospect |
| Bradford Ranch | Santa Clara | Surface | Past Producer |
| Brush | Sonoma | Occurrence | |
| Burgaus Ranch | Sonoma | Occurrence | |
| California Magnesite, Camp 4 | Tulare | Unknown | |
| California Magnesite, Camps 2 and 3 | Tulare | Unknown |
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