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MSHA mine register by county

Mines in Tuolumne County, California

Tuolumne County, California has 23 mines on MSHA's register: 3 active, 20 abandoned. 4 miners have died and 455 accidents have been reported at these mines between 1984 and 2026. Inspectors have issued 751 citations.

Every mine MSHA has registered in Tuolumne 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.

Abandoned and historical mine features in Tuolumne County →

Mines on register
23
Active
3
Fatalities on record
4
Citations issued
751
5 underground · 14 surface · 4 facilities 0 coal · 23 metal and non-metal 20 abandoned 455 reported accidents, 1984–2026
Local economic context
ⓘ 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.
Tuolumne County, California · Population 54,873
0.3%
Mining share of county employment
$72,259
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
On the map 
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MSHA-registered mine, any status

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.

Operators with the most mines herecurrent operator of record
Operator Mines Active Fatalities
Sonora Aggregates Corp 3 0 0
Sierra Rock Products 2 1 3
Marine Magnesium Company 2 0 0
Sonora Mining Corp 1 0 1
Architectural Aggregates 1 0 0
Bedford Aggregates 1 0 0
Blue Mountain Minerals 1 1 0
Ford Construction Company Inc 1 0 0
G P Mining Company 1 0 0
George Reed Inc 1 1 0
Mines in Tuolumne County23 on register
  1. SIERRA ROCK PRODUCTS
    Surface metal/non-metal · Sierra Rock Products · MSHA ID 0403489
    Active
  2. BLUE MOUNTAIN MINERALS
    Surface metal/non-metal · Blue Mountain Minerals · MSHA ID 0404716
    Active
  3. Table Mountain Plant & Quarry
    Surface metal/non-metal · George Reed Inc · MSHA ID 0403126
    Active
  4. Jamestown Mine
    Surface metal/non-metal · Sonora Mining Corp · MSHA ID 0404695
    Abandoned
  5. Alto Mine
    Surface metal/non-metal · Glamis Gold Inc · MSHA ID 0405103
    Abandoned
  6. KEYSTONE MILL
    Facility metal/non-metal · Bedford Aggregates · MSHA ID 0402347
    Abandoned
  7. Marine Dolomite Mill
    Facility metal/non-metal · Marine Magnesium Company · MSHA ID 0403493
    Abandoned
  8. Sonora Mill And Quarries
    Facility metal/non-metal · Sonora Aggregates Corp · MSHA ID 0402351
    Abandoned
  9. Montezuma Sand & Gravel
    Surface metal/non-metal · Sierra Rock Products · MSHA ID 0405165
    Abandoned
  10. Portable Plant #2
    Surface metal/non-metal · Ford Construction Company Inc · MSHA ID 0405759
    Abandoned
  11. Columbia Portable
    Surface metal/non-metal · Sierra Rock · MSHA ID 0405193
    Abandoned
  12. Columbia Quarry
    Surface metal/non-metal · Marine Magnesium Company · MSHA ID 0402297
    Abandoned
  13. Haigh Quarry
    Surface metal/non-metal · Sunset Materials · MSHA ID 0402341
    Abandoned
  14. Jacmar Quarry
    Surface metal/non-metal · Jacmar Communications Construction Inc · MSHA ID 0404987
    Abandoned
  15. Mc Alpine Mine
    Underground metal/non-metal · Jerry Dubson Partner · MSHA ID 0404515
    Abandoned
  16. Omega Mine
    Underground metal/non-metal · G P Mining Company · MSHA ID 0404536
    Abandoned
  17. Optimist Mining Co
    Underground metal/non-metal · Optimist Mining Co · MSHA ID 0404584
    Abandoned
  18. Sarbo Claim
    Underground metal/non-metal · N F Sarbo & D R Langenberg · MSHA ID 0404472
    Abandoned
  19. Sonora Black Quarry
    Surface metal/non-metal · Sonora Aggregates Corp · MSHA ID 0402350
    Abandoned
  20. Sonora White Quarry
    Surface metal/non-metal · Sonora Aggregates Corp · MSHA ID 0400272
    Abandoned
  21. Star King
    Underground metal/non-metal · Star King Mining Company · MSHA ID 0404882
    Abandoned
  22. Sundborg Quarry And Mill
    Surface metal/non-metal · Architectural Aggregates · MSHA ID 0403006
    Abandoned
  23. Watsons Wood Creek Mill
    Facility metal/non-metal · R D Watson Inc · MSHA ID 0404266
    Abandoned

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.

Other counties in CaliforniaAll counties →
How to read these numbers

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.