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MSHA mine register by county

Mines in Contra Costa County, California

Contra Costa County, California has 21 mines on MSHA's register: 5 active, 16 abandoned. 359 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 899 citations.

Every mine MSHA has registered in Contra Costa 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 Contra Costa County →

Mines on register
21
Active
5
Fatalities on record
0
Citations issued
899
0 underground · 19 surface · 2 facilities 0 coal · 21 metal and non-metal 16 abandoned 359 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.
Contra Costa County, California · Population 1,161,458
0.1%
Mining share of county employment
$125,727
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
Foss Maritime Company 3 1 0
FTG Construction Materials Inc 2 0 0
Jones Sand Company 2 0 0
Martin Marietta Northern California Aggregates,LLC 2 1 0
American Rock & Asphalt Inc 1 0 0
Bauman Landscape 1 0 0
CEMEX Construction Materials Pacific, LLC 1 1 0
Chemstar Lime Company 1 0 0
Dutra Materials 1 0 0
G3 Enterprises, Inc. 1 1 0
Mines in Contra Costa County21 on register
  1. G3 Enterprises Byron Plant
    Surface metal/non-metal · G3 Enterprises, Inc. · MSHA ID 0401949
    Active
  2. Clayton Aggregates
    Surface metal/non-metal · Martin Marietta Northern California Aggregates,LLC · MSHA ID 0400159
    Active
  3. Clayton Plant
    Surface metal/non-metal · CEMEX Construction Materials Pacific, LLC · MSHA ID 0400173
    Active
  4. Sand Merchant
    Surface metal/non-metal · Foss Maritime Company · MSHA ID 0405498
    Active
  5. Kellog Creek Aggregates Inc
    Surface metal/non-metal · Kellog Creek Aggregates Inc · MSHA ID 0403622
    Active
  6. TXI-Port Costa Plant
    Surface metal/non-metal · Pacific Custom Materials Inc · MSHA ID 0400599
    Abandoned
  7. RICHMOND QUARRY
    Surface metal/non-metal · Dutra Materials · MSHA ID 0400228
    Abandoned
  8. Marina Vista Plant
    Surface metal/non-metal · Hanson Aggregates Mid-Pacific, Inc. · MSHA ID 0405362
    Abandoned
  9. DS-10
    Surface metal/non-metal · Foss Maritime Company · MSHA ID 0405468
    Abandoned
  10. Point Richmond Quarry
    Surface metal/non-metal · Bauman Landscape · MSHA ID 0405247
    Abandoned
  11. SB-20
    Surface metal/non-metal · Foss Maritime Company · MSHA ID 0405499
    Abandoned
  12. Quarry #4
    Surface metal/non-metal · American Rock & Asphalt Inc · MSHA ID 0404732
    Abandoned
  13. Sand Hill Ranch
    Surface metal/non-metal · FTG Construction Materials Inc · MSHA ID 0405224
    Abandoned
  14. Richmond Mill/Stockton
    Facility metal/non-metal · Chemstar Lime Company · MSHA ID 0402315
    Abandoned
  15. MARTINEZ WATERFRONT PLANT
    Surface metal/non-metal · Hanson Aggregates West Inc · MSHA ID 0405487
    Abandoned
  16. DS-10
    Surface metal/non-metal · Jones Sand Company · MSHA ID 0405417
    Abandoned
  17. Morris Sand Pit
    Surface metal/non-metal · William G Mc Cullough Company · MSHA ID 0401863
    Abandoned
  18. Richmond Plant
    Facility metal/non-metal · National Gypsum Company · MSHA ID 0400919
    Abandoned
  19. SB-20
    Surface metal/non-metal · Jones Sand Company · MSHA ID 0405416
    Abandoned
  20. Scott Pit
    Surface metal/non-metal · Oliver De Silva Inc · MSHA ID 0403741
    Abandoned
  21. Stoner Sand Pit
    Surface metal/non-metal · F T G Construction Materials Inc · MSHA ID 0405032
    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.