| Deposit ID | 10214460 |
|---|---|
| MAS/MILS ID | 0061099002 |
| Record type | Site |
| Current site name | Sonora Plant |
| Alternate or previous names | Marine Dolomite Mill |
| Point of reference | Plant |
|---|---|
| Geographic coordinates: | -120.376, 37.96682 (WGS84) |
| Elevation | 620 |
| Location accuracy | 100(meters) |
Political divisions (FIPS codes)
Tuolumne(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Sonora(quadrangle 1:24,000 scale)
Oakdale(quadrangle 1:100,000 scale)
San Jose(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Tuolumne(hydrologic unit)
San Joaquin(hydrologic accounting unit)
San Joaquin(hydrologic subregion)
California(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | California | Tuolumne |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 001 N | 015 E | 06 | S2 | California |
| Commodity | Importance |
|---|---|
| Magnesite | Primary |
| Plant (1) | -120.376, 37.96682 |
|---|
| Operation type | Processing Plant |
|---|---|
| Development status | Producer |
| Commodity type | Metallic |
| Significant | No |
| Type of mineral rights | Unknown |
|---|
| Ownership category | Unknown |
|---|
| Type | Operator |
|---|---|
| Owner | Merck And Co., Inc. |
| ID | 403493 |
| Home office | California |
| Year | 1979 |
| Type | Owner-Operator |
|---|---|
| Owner | Marine Magnesium Co. |
| ID | 403493 |
| Home office | California |
| Year | 1991 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0061099002 | |
| Mine Safety and Health Administration | MSHA | MSHA | 0403493 |
MSHA.
CALIF. DIV. MINES AND GEOL. ACTIVE MINES DATABASE (1991).
| Subject category | Comment text |
|---|---|
| Deposit | LIMEKILN ROAD, ABOUT .75 MILE SOUTH OF HIGHWAY 108. COMMODITY IS LIMESTONE |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 20-MAY-1992 | Ridenour, James | U.S. Bureau of Mines |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
| Status | Abandoned since 06/27/1995 |
|---|---|
| MSHA mine ID | 0403493 |
| Mine name (MSHA) | Marine Dolomite Mill |
| Current operator | Marine Magnesium Company |
| Current controller (parent) | Cph Sub Inc & Marine Magnesium Management Company |
| Mine type | Facility (Metal / non-metal) |
MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.
Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.