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MSHA mine register by county

Mines in Santa Clara County, California

Santa Clara County, California has 28 mines on MSHA's register: 2 active, 2 intermittent, 23 abandoned. 3 miners have died and 790 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 2,629 citations.

Every mine MSHA has registered in Santa Clara 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 Santa Clara County →

Mines on register
28
Active
2
Fatalities on record
3
Citations issued
2,629
0 underground · 25 surface · 3 facilities 0 coal · 28 metal and non-metal 2 intermittent 23 abandoned 790 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.
Santa Clara County, California · Population 1,903,297
0.0%
Mining share of county employment
$159,674
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
Lehigh Southwest Cement Company 3 0 2
CalMat Co 2 1 0
Hillsdale Rock Company 2 0 0
Piazza Construction Company 2 0 0
Raisch Products 2 0 0
TMT ENTERPRISES, INC. 2 0 0
Stevens Creek Quarry Inc 1 1 1
Azevedo Quarry 1 0 0
Brems Sand & Gravel 1 0 0
Calaveras Rock Inc 1 0 0
Mines in Santa Clara County28 on register
  1. Stevens Creek Quarry
    Surface metal/non-metal · Stevens Creek Quarry Inc · MSHA ID 0401676
    Active
  2. LEXINGTON QUARRY
    Surface metal/non-metal · CalMat Co · MSHA ID 0400946
    Active
  3. Permanente Cement Plant & Quarry
    Facility metal/non-metal · Lehigh Southwest Cement Co. · MSHA ID 0404075
    Temporarily Idled
  4. Lehigh Permanente Quarry
    Surface metal/non-metal · Lehigh Southwest Cement Co. · MSHA ID 0400158
    Abandoned
  5. AZEVEDO QUARRY
    Surface metal/non-metal · Azevedo Quarry · MSHA ID 0404131
    Abandoned
  6. Freeman Quarry
    Surface metal/non-metal · Granite Construction Company · MSHA ID 0405448
    Abandoned
  7. SERPA PIT QUARRY
    Surface metal/non-metal · Raisch Products · MSHA ID 0402880
    Abandoned
  8. Patton Quarry And Mill
    Surface metal/non-metal · Patton Brothers Inc · MSHA ID 0400205
    Abandoned
  9. Mt View
    Surface metal/non-metal · Kaiser Sand & Gravel Company · MSHA ID 0403351
    Abandoned
  10. Curtner Quarry
    Surface metal/non-metal · DeSilva Gates Construction, LLC · MSHA ID 0405337
    Intermittent
  11. Hillsdale Pit And Mill Plant
    Surface metal/non-metal · Hillsdale Rock Company · MSHA ID 0400136
    Abandoned
  12. RAISCH PRODUCTS
    Facility metal/non-metal · Raisch Products · MSHA ID 0405049
    Abandoned
  13. Permanente Rock Plant
    Facility metal/non-metal · Lehigh Southwest Cement Company · MSHA ID 0405870
    Abandoned
  14. PORTABLE EXTEC
    Surface metal/non-metal · TMT ENTERPRISES, INC. · MSHA ID 0405788
    Abandoned
  15. Portable #2
    Surface metal/non-metal · Kroeker Inc · MSHA ID 0405824
    Abandoned
  16. Cupertino Quarry
    Surface metal/non-metal · Calmat Co · MSHA ID 0405987
    Intermittent
  17. Brems Pit
    Surface metal/non-metal · Brems Sand & Gravel · MSHA ID 0401708
    Abandoned
  18. Calaveras Rock Incorporated
    Surface metal/non-metal · Calaveras Rock Inc · MSHA ID 0402280
    Abandoned
  19. Curtner Pit
    Surface metal/non-metal · Freeman-Sondgroth · MSHA ID 0403827
    Abandoned
  20. Hellyer Pit
    Surface metal/non-metal · Max Abbott · MSHA ID 0403860
    Abandoned
  21. Hubble Quarry And Mill
    Surface metal/non-metal · Piazza Construction Company · MSHA ID 0402268
    Abandoned
  22. Hubble Sand & Gravel Pit & Mill
    Surface metal/non-metal · Piazza Construction Company · MSHA ID 0401837
    Abandoned
  23. Metcalf Plant No 2
    Surface metal/non-metal · Hillsdale Rock Company · MSHA ID 0402882
    Abandoned
  24. Page Quarry And Mill
    Surface metal/non-metal · Page Mill Quarry Corp · MSHA ID 0400215
    Abandoned
  25. Permanente Quarry
    Surface metal/non-metal · Kaiser Cement Corp · MSHA ID 0404353
    Abandoned
  26. Portable Rascal
    Surface metal/non-metal · TMT Enterprises, Inc. · MSHA ID 0405849
    Abandoned
  27. Road Builders Pit
    Surface metal/non-metal · Thomas R Bess · MSHA ID 0404111
    Abandoned
  28. Western Tile Sand & Gravel
    Surface metal/non-metal · Western Tile & Supply Company · MSHA ID 0402000
    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.