Langley Hill Quarry Metal/Non-Metal
Langley Hill Quarry
· Surface
Controlled by
Michael W Dempsey; Patrick K Dempsey
WOODSIDE,
San Mateo County,
CA
·
Active
MSHA Mine ID: 0400170
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2000
84
citations
21
significant & substantial
$9,855
proposed penalties
$9,855
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 1,224 | 2 | 0 | 1634.0 |
| 2025 Q3 | 1,154 | 0 | 0 | 0.0 |
| 2025 Q2 | 1,252 | 0 | 0 | 0.0 |
| 2025 Q1 | 1,084 | 3 | 0 | 2767.5 |
| 2024 Q4 | 1,116 | 0 | 0 | 0.0 |
| 2024 Q3 | 1,060 | 0 | 0 | 0.0 |
| 2024 Q2 | 1,280 | 0 | 0 | 0.0 |
| 2023 Q4 | 1,234 | 0 | 0 | 0.0 |
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.