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MSHA mine register by county

Mines in Napa County, California

Napa County, California has 8 mines on MSHA's register: 1 active, 7 abandoned. 203 accidents have been reported at these mines between 1983 and 2026. Inspectors have issued 244 citations.

Every mine MSHA has registered in Napa 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 Napa County →

Mines on register
8
Active
1
Fatalities on record
0
Citations issued
244
0 underground · 7 surface · 1 facilities 0 coal · 8 metal and non-metal 7 abandoned 203 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.
Napa County, California · Population 136,070
0.1%
Mining share of county employment
$108,970
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
Amos & Andrews Inc 1 0 0
CalMat Co 1 1 0
Don Wesner Inc. 1 0 0
Gardner'S Rock Company 1 0 0
Harold Smith & Son Inc 1 0 0
One Shot Mining Company 1 0 0
Rays Rock Sand & Gravel Company 1 0 0
Syar Industries Inc 1 0 0
Mines in Napa County8 on register
  1. Napa Quarry
    Surface metal/non-metal · CalMat Co · MSHA ID 0400023
    Active
  2. Napa Shop
    Facility metal/non-metal · Syar Industries Inc · MSHA ID 0405242
    Abandoned
  3. Blue Rock
    Surface metal/non-metal · Don Wesner Inc. · MSHA ID 0405519
    Abandoned
  4. American Canyon
    Surface metal/non-metal · Amos & Andrews Inc · MSHA ID 0404863
    Abandoned
  5. Gardners Rock
    Surface metal/non-metal · Gardner'S Rock Company · MSHA ID 0402181
    Abandoned
  6. Manhattan Mine
    Surface metal/non-metal · One Shot Mining Company · MSHA ID 0400868
    Abandoned
  7. Ray'S Base Plant
    Surface metal/non-metal · Rays Rock Sand & Gravel Company · MSHA ID 0403391
    Abandoned
  8. Sulphur Creek Sand And Gravel
    Surface metal/non-metal · Harold Smith & Son Inc · MSHA ID 0401799
    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.