Mines in Mariposa County, California
Mariposa County, California has 31 mines on MSHA's register: 2 active, 2 intermittent, 27 abandoned. 51 accidents have been reported at these mines between 1987 and 2014. Inspectors have issued 230 citations.
Every mine MSHA has registered in Mariposa County, working or not, with the accident, fatality and citation record each one carries on this site. Active mines are listed first, then the rest by the weight of their record.
- Mines on register
- 31
- Active
- 2
- Fatalities on record
- 0
- Citations issued
- 230
ⓘ
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.Mines plot only where MSHA holds a surveyed coordinate for the site; mines the agency locates to a town, county or state centroid are in the counts and the list above but not drawn. Click a point for the mine's status and record.
| Operator | Mines | Active | Fatalities |
|---|---|---|---|
| Western States Mining Company Inc | 3 | 0 | 0 |
| Mark Long Tractor Work | 2 | 0 | 0 |
| A T & E Enterprises Inc | 1 | 0 | 0 |
| Aurum Technologies Inc | 1 | 0 | 0 |
| Claro Management | 1 | 0 | 0 |
| Colorado Quartz Gold Corp | 1 | 0 | 0 |
| Eagle Rock Inc | 1 | 0 | 0 |
| Emmett's Excavation Inc | 1 | 0 | 0 |
| Fred Silva Enterprises | 1 | 0 | 0 |
| Fremont Gold Mining LLC | 1 | 0 | 0 |
-
MT. GAINES MINEActive 0 fatal 52 citationsSurface metal/non-metal · Mt Gaines Rock · MSHA ID 0404794
-
Blue Moon Underground MineActive 0 fatal 5 citationsUnderground metal/non-metal · Small Mine Development · MSHA ID 0405990
-
MARIPOSA AGGREGATES QUARRYAbandoned 0 fatal 25 citationsSurface metal/non-metal · Mariposa Aggregates · MSHA ID 0404785
-
Bear Creek QuarryAbandoned 0 fatal 18 citationsSurface metal/non-metal · Mariposa Decco Rock, Inc · MSHA ID 0405474
-
WILLIAM BROS MINEAbandoned 0 fatal 0 citationsUnderground metal/non-metal · A T & E Enterprises Inc · MSHA ID 0405146
-
Colorado QuartzAbandoned 0 fatal 43 citationsUnderground metal/non-metal · Colorado Quartz Gold Corp · MSHA ID 0403828
-
Mockingbird MineAbandoned 0 fatal 31 citationsUnderground metal/non-metal · Emmett's Excavation Inc · MSHA ID 0405781
-
Yosemite Slate QuarryIntermittent 0 fatal 19 citationsSurface metal/non-metal · Mariposa Yosemite Slate Quarry · MSHA ID 0400357
-
LONG DECOMPOSED GRANITE PITIntermittent 0 fatal 20 citationsSurface metal/non-metal · Mark Long Tractor Work · MSHA ID 0405398
-
IRON SPRINGS CONSOLIDATEDAbandoned 0 fatal 14 citationsSurface metal/non-metal · Mark Long Tractor Work · MSHA ID 0405381
-
NMP Mariposa OperationAbandoned 0 fatal 3 citationsSurface metal/non-metal · Noble Metals Processing LLC · MSHA ID 0405686
-
ArtruAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Fred Silva Enterprises · MSHA ID 0404888
-
BondurantAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Grant Exploration Ltd · MSHA ID 0404491
-
Diltz MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Lobo Mining Corp · MSHA ID 0404069
-
Goods Gulch MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Goods Gulch Mining Company · MSHA ID 0404089
-
Grizzly QuarryAbandoned 0 fatal 0 citationsSurface metal/non-metal · Eagle Rock Inc · MSHA ID 0404450
-
HasloeAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Gentry Gulch Mining Inc · MSHA ID 0404813
-
HorseshoeAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404620
-
Mariposa Sand & Gravel Pit & MillAbandoned 0 fatal 0 citationsSurface metal/non-metal · Mariposa Sand & Gravel · MSHA ID 0401850
-
Mockingbird MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Par Mining & Exploration · MSHA ID 0404757
-
Nellie Kahoe MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Texas Hill Mines Company · MSHA ID 0404378
-
Penon Blanco MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404436
-
Penon Blanco MineAbandoned 0 fatal 0 citationsSurface metal/non-metal · Penon Blanco Mineral Resources · MSHA ID 0405566
-
Pine Tree-JosephineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Fremont Gold Mining LLC · MSHA ID 0404793
-
Princeton LandsAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404527
-
Quail MineAbandoned 0 fatal 0 citationsFacility metal/non-metal · Southwind Texas Mining Corp · MSHA ID 0404605
-
Red CloudAbandoned 0 fatal 0 citationsUnderground metal/non-metal · G F Phipps Partnership · MSHA ID 0405050
-
Red Cloud MineAbandoned 0 fatal 0 citationsSurface metal/non-metal · Aurum Technologies Inc · MSHA ID 0404771
-
Squantum MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Mono Camp Company · MSHA ID 0404397
-
Virginia-Belmont MineAbandoned 0 fatal 0 citationsUnderground metal/non-metal · Claro Management · MSHA ID 0404497
-
Yosemite Slate QuarryAbandoned 0 fatal 0 citationsSurface metal/non-metal · Mariposa County Department Of Public Works · MSHA ID 0405136
Status, type and operator are as reported to MSHA. Fatality and accident counts are MSHA's reportable accident records for the mine; citations are inspector-issued violations on record. Each mine's own page carries the full detail.
The register is MSHA's Mine Data Retrieval System: every operation ever assigned a mine ID, including ones abandoned decades ago, so the count is a history of mining in the county, not a count of working mines. A mine's county is the one its operator reported to MSHA. Fatality and accident counts start with MSHA's reportable-accident records (1983 onward); citation counts are inspector-issued violations on record. We are an independent research tool, not MSHA.