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MSHA mine register by county

Mines in Orange County, California

Orange County, California has 35 mines on MSHA's register: 2 active, 33 abandoned. 1 miner has died and 503 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 699 citations.

Every mine MSHA has registered in Orange 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 Orange County →

Mines on register
35
Active
2
Fatalities on record
1
Citations issued
699
0 underground · 35 surface · 0 facilities 0 coal · 35 metal and non-metal 33 abandoned 503 reported accidents, 1983–2026
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.
Orange County, California · Population 3,164,063
0.1%
Mining share of county employment
$113,702
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
Blue Diamond Materials 3 0 0
Conrock Company 2 0 0
Fst Sand & Gravel Inc 2 0 0
Materials Transport Services Inc 2 0 0
Ortiz Crushing Corporation 2 0 0
Robertson's Ready Mix, Ltd. 1 0 1
Asbury Contractors Inc 1 0 0
California Non-Metallics 1 0 0
Calmat Company 1 0 0
Calmat Company 1 0 0
Mines in Orange County35 on register
  1. Orange County Operation
    Surface metal/non-metal · Lapeyre Industrial Sands LLC · MSHA ID 0402801
    Active
  2. Greenstone Materials Quarry
    Surface metal/non-metal · Greenstone Materials, Inc. · MSHA ID 0403299
    Active
  3. Star
    Surface metal/non-metal · Robertson's Ready Mix, Ltd. · MSHA ID 0401880
    Abandoned
  4. Mission Viejo Materials Incorporated
    Surface metal/non-metal · Mission Viejo Materials Inc · MSHA ID 0401842
    Abandoned
  5. El Toro Materials Co
    Surface metal/non-metal · El Toro Materials Co · MSHA ID 0402884
    Abandoned
  6. Irvine Lake Rock Plant
    Surface metal/non-metal · Livingston Graham/Blue Diamond Materials · MSHA ID 0404085
    Abandoned
  7. TRP-Irvine Lake Plant
    Surface metal/non-metal · Calmat Company · MSHA ID 0405277
    Abandoned
  8. San Juan Plant
    Surface metal/non-metal · Calmat Company · MSHA ID 0401738
    Abandoned
  9. West Coast Aggregate Supply Inc
    Surface metal/non-metal · West Coast Aggregate Supply, Inc · MSHA ID 0405678
    Abandoned
  10. Ranch Rock Capo
    Surface metal/non-metal · Ranch Rock Corporation · MSHA ID 0405444
    Abandoned
  11. FST OGLEBAY NORTON
    Surface metal/non-metal · Fst Sand & Gravel Inc · MSHA ID 0405076
    Abandoned
  12. 72080P-2
    Surface metal/non-metal · Ortiz Enterprises Inc · MSHA ID 0405665
    Abandoned
  13. Santiago Canyon Plant
    Surface metal/non-metal · Transit Mixed Concrete Company · MSHA ID 0402100
    Abandoned
  14. Dayton Trucking (Portable)
    Surface metal/non-metal · Dayton Trucking Inc · MSHA ID 0405342
    Abandoned
  15. 72113R-1
    Surface metal/non-metal · Ortiz Crushing Corporation · MSHA ID 0405666
    Abandoned
  16. Portable Screen #1
    Surface metal/non-metal · L&G Portable Crushing and Materials, LLC · MSHA ID 0405915
    Abandoned
  17. Plant 3
    Surface metal/non-metal · North American Recycling and Crushing, LLC · MSHA ID 0405535
    Abandoned
  18. 33870P-1
    Surface metal/non-metal · Ortiz Crushing Corporation · MSHA ID 0405664
    Abandoned
  19. Asbury El Toro Ltd
    Surface metal/non-metal · Asbury Contractors Inc · MSHA ID 0404147
    Abandoned
  20. Atwood
    Surface metal/non-metal · Conrock Company · MSHA ID 0401733
    Abandoned
  21. El Toro Plant
    Surface metal/non-metal · Blue Diamond Materials · MSHA ID 0401968
    Abandoned
  22. Hidden Hills Plant
    Surface metal/non-metal · G & M Trucking · MSHA ID 0405014
    Abandoned
  23. Huntington Beach Plant
    Surface metal/non-metal · Blue Diamond Materials · MSHA ID 0403426
    Abandoned
  24. Mission Viejo Clay Pit
    Surface metal/non-metal · Riverside Cement Company · MSHA ID 0400531
    Abandoned
  25. Orange County Water District Sand P
    Surface metal/non-metal · Materials Transport Services Inc · MSHA ID 0404043
    Abandoned
  26. Orange Plant
    Surface metal/non-metal · Conrock Company · MSHA ID 0401737
    Abandoned
  27. Orange Plant
    Surface metal/non-metal · R J Noble Company · MSHA ID 0401918
    Abandoned
  28. Portable Operation
    Surface metal/non-metal · Dalton Trucking Inc · MSHA ID 0404778
    Abandoned
  29. Rc 1 Orange Plant
    Surface metal/non-metal · Blue Diamond Materials · MSHA ID 0401969
    Abandoned
  30. Reliable Crushing
    Surface metal/non-metal · Reliable Crushing Inc · MSHA ID 0404849
    Abandoned
  31. San Clemente Plant
    Surface metal/non-metal · Crestlite Aggregates Inc · MSHA ID 0400549
    Abandoned
  32. San Clemente Project
    Surface metal/non-metal · Guy F Atkinson Company · MSHA ID 0404382
    Abandoned
  33. Trabuco Canyon Plant
    Surface metal/non-metal · California Non-Metallics · MSHA ID 0400542
    Abandoned
  34. Villa Park Dam
    Surface metal/non-metal · Fst Sand & Gravel Inc · MSHA ID 0405006
    Abandoned
  35. Yorba Linda
    Surface metal/non-metal · Materials Transport Services Inc · MSHA ID 0404850
    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.