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MSHA mine register by county

Mines in Alameda County, California

Alameda County, California has 31 mines on MSHA's register: 6 active, 25 abandoned. 2 miners have died and 698 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 1,700 citations.

Every mine MSHA has registered in Alameda 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 Alameda County →

Mines on register
31
Active
6
Fatalities on record
2
Citations issued
1,700
0 underground · 28 surface · 3 facilities 0 coal · 31 metal and non-metal 25 abandoned 698 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.
Alameda County, California · Population 1,651,949
0.0%
Mining share of county employment
$126,240
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
Dumbarton Quarry Associates 3 0 0
Hanson Aggregates West Inc 2 0 0
Kaiser Sand & Gravel Company 2 0 0
Mission Valley Rock, LLC 2 1 0
Gallagher & Burk Inc 1 0 2
California Rock & Gravel Company 1 0 0
CalMat Co 1 1 0
CEMEX Construction Materials Pacific, LLC 1 1 0
Commercial Minerals Company Inc 1 0 0
DeSilva Gates Construction LLC 1 1 0
Mines in Alameda County31 on register
  1. Pleasanton Plant
    Surface metal/non-metal · CalMat Co · MSHA ID 0401924
    Active
  2. Eliot Plant
    Surface metal/non-metal · CEMEX Construction Materials Pacific, LLC · MSHA ID 0401891
    Active
  3. Sunol Aggregates
    Surface metal/non-metal · Mission Valley Rock, LLC · MSHA ID 0401859
    Active
  4. DeSilva Gates Aggregates
    Surface metal/non-metal · DeSilva Gates Construction LLC · MSHA ID 0402098
    Active
  5. Tidewater Oakland Marine Aggregate
    Surface metal/non-metal · Martin Marietta Northern California Aggregates,LLC · MSHA ID 0403002
    Active
  6. Sheridan Quarry
    Surface metal/non-metal · Stevens Creek Quarry, Inc · MSHA ID 0405791
    Active
  7. Leona Quarry
    Surface metal/non-metal · Gallagher & Burk Inc · MSHA ID 0400113
    Abandoned
  8. Radum
    Surface metal/non-metal · Hanson Aggregates West Inc · MSHA ID 0401827
    Abandoned
  9. DQA Dumbarton Quarry
    Surface metal/non-metal · DQA · MSHA ID 0402380
    Abandoned
  10. DQA La Vista Quarry
    Surface metal/non-metal · DQA · MSHA ID 0400097
    Abandoned
  11. Ivaldi Bros Quarry
    Surface metal/non-metal · East Bay Excavating Company Inc · MSHA ID 0404421
    Abandoned
  12. Commercial Minerals Mill
    Facility metal/non-metal · Commercial Minerals Company Inc · MSHA ID 0404357
    Abandoned
  13. Oakland Sand Co
    Facility metal/non-metal · Mission Valley Rock Company · MSHA ID 0405343
    Abandoned
  14. Portable Plant 7
    Surface metal/non-metal · North American Recycling and Crushing, LLC · MSHA ID 0405633
    Abandoned
  15. Alameda Plant
    Surface metal/non-metal · Kaiser Sand & Gravel Company · MSHA ID 0404115
    Abandoned
  16. Central Maintenance Heavy Equipment Shop
    Surface metal/non-metal · Kaiser Sand & Gravel Company · MSHA ID 0404274
    Abandoned
  17. Dumbarton Quarry
    Surface metal/non-metal · Dumbarton Quarry Associates · MSHA ID 0402379
    Abandoned
  18. Durham Pit
    Surface metal/non-metal · Sand'S Quarry · MSHA ID 0403819
    Abandoned
  19. Kilite
    Surface metal/non-metal · Lassenite Industries Inc · MSHA ID 0400576
    Abandoned
  20. Kraftile Mill
    Facility metal/non-metal · Kraftile Co · MSHA ID 0400578
    Abandoned
  21. Livermore Pit And Mill
    Surface metal/non-metal · California Rock & Gravel Company · MSHA ID 0401718
    Abandoned
  22. Newark Plant
    Surface metal/non-metal · Morton Salt Division · MSHA ID 0403302
    Abandoned
  23. Newark Plant
    Surface metal/non-metal · Leslie Salt Company · MSHA ID 0403949
    Abandoned
  24. Niles
    Surface metal/non-metal · Quarry Products Inc · MSHA ID 0401870
    Abandoned
  25. Niles Clay Pit
    Surface metal/non-metal · Interlocking Roof Tile Company · MSHA ID 0400563
    Abandoned
  26. Niles Clay Plant
    Surface metal/non-metal · Mission Clay Products Corp · MSHA ID 0400586
    Abandoned
  27. Oliver Brothers Salt
    Surface metal/non-metal · Oliver Brothers Salt Company · MSHA ID 0404034
    Abandoned
  28. Portable #1
    Surface metal/non-metal · Inner City Recycling Inc · MSHA ID 0405800
    Abandoned
  29. Portable Crusher
    Surface metal/non-metal · Piombo Construction Company · MSHA ID 0404764
    Abandoned
  30. San Leandro Quarry
    Surface metal/non-metal · San Leandro Rock Company · MSHA ID 0400242
    Abandoned
  31. SAND MERCHANT
    Surface metal/non-metal · Hanson Aggregates West Inc · MSHA ID 0405415
    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.