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MSHA mine register by county

Mines in Marin County, California

Marin County, California has 7 mines on MSHA's register: 1 active, 6 abandoned. 79 accidents have been reported at these mines between 1983 and 2025. Inspectors have issued 370 citations.

Every mine MSHA has registered in Marin 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 Marin County →

Mines on register
7
Active
1
Fatalities on record
0
Citations issued
370
0 underground · 7 surface · 0 facilities 0 coal · 7 metal and non-metal 6 abandoned 79 reported accidents, 1983–2025
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.
Marin County, California · Population 258,765
0.0%
Mining share of county employment
$142,785
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
Borello Ranch Quarry 1 0 0
Bowman Canyon Quarry Inc 1 0 0
Dag Industries 1 0 0
Dutra Materials 1 1 0
L P Mc Near Brick Co 1 0 0
Lawson'S Landing 1 0 0
Lunny Grading & Paving Inc 1 0 0
Mines in Marin County7 on register
  1. San Rafael Rock Quarry
    Surface metal/non-metal · Dutra Materials · MSHA ID 0400021
    Active
  2. Nicasio Rock Quarry
    Surface metal/non-metal · Lunny Grading & Paving Inc · MSHA ID 0405454
    Abandoned
  3. Bowman Canyon Quarry Incorporated
    Surface metal/non-metal · Bowman Canyon Quarry Inc · MSHA ID 0405221
    Abandoned
  4. DAG Industries Inc
    Surface metal/non-metal · Dag Industries · MSHA ID 0405455
    Abandoned
  5. Borello Ranch Quarry
    Surface metal/non-metal · Borello Ranch Quarry · MSHA ID 0405144
    Abandoned
  6. Dillon Beach Sand
    Surface metal/non-metal · Lawson'S Landing · MSHA ID 0404246
    Abandoned
  7. Mcnear Brick Company Quarry
    Surface metal/non-metal · L P Mc Near Brick Co · MSHA ID 0400580
    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.