Mines in San Mateo County, California
San Mateo County, California has 11 mines on MSHA's register: 1 active, 1 intermittent, 9 abandoned. 2 miners have died and 78 accidents have been reported at these mines between 1983 and 2017. Inspectors have issued 530 citations.
Every mine MSHA has registered in San Mateo 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 San Mateo County →
- Mines on register
- 11
- Active
- 1
- Fatalities on record
- 2
- Citations issued
- 530
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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.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.
| Operator | Mines | Active | Fatalities |
|---|---|---|---|
| Evans Brothers Inc | 1 | 0 | 1 |
| Langley Hill Quarry | 1 | 1 | 1 |
| Brisbane Recycling Co., Inc. | 1 | 0 | 0 |
| CalMat Co | 1 | 0 | 0 |
| CEMEX Construction Materials LP | 1 | 0 | 0 |
| Edgewood Materials Inc | 1 | 0 | 0 |
| Kiewit Pacific Co. | 1 | 0 | 0 |
| Leslie Salt Company | 1 | 0 | 0 |
| Quarry Products Inc | 1 | 0 | 0 |
| Ryan Engineering, Inc. | 1 | 0 | 0 |
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Langley Hill QuarryActive 1 fatal 84 citationsSurface metal/non-metal · Langley Hill Quarry · MSHA ID 0400170
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GuadalupeIntermittent 1 fatal 193 citationsSurface metal/non-metal · Evans Brothers Inc · MSHA ID 0400174
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PILARCITOS QUARRYAbandoned 0 fatal 220 citationsSurface metal/non-metal · CalMat Co · MSHA ID 0402261
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Harbor PlantAbandoned 0 fatal 33 citationsSurface metal/non-metal · CEMEX Construction Materials LP · MSHA ID 0405528
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Pacifica QuarryAbandoned 0 fatal 0 citationsSurface metal/non-metal · Quarry Products Inc · MSHA ID 0400362
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BrisbaneAbandoned 0 fatal 0 citationsSurface metal/non-metal · Kiewit Pacific Co. · MSHA ID 0405213
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Brisbane PlantAbandoned 0 fatal 0 citationsSurface metal/non-metal · Brisbane Recycling Co., Inc. · MSHA ID 0405541
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Edgewood Quarry And MillAbandoned 0 fatal 0 citationsSurface metal/non-metal · Edgewood Materials Inc · MSHA ID 0401624
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Powerscreen PlantAbandoned 0 fatal 0 citationsSurface metal/non-metal · Ryan Engineering, Inc. · MSHA ID 0405542
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Redwood City PlantAbandoned 0 fatal 0 citationsSurface metal/non-metal · Leslie Salt Company · MSHA ID 0404277
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Skyline QuarryAbandoned 0 fatal 0 citationsSurface metal/non-metal · San Francisco Water Department · MSHA ID 0404054
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.
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.