Cupertino Quarry Metal/Non-Metal
Calmat Co
· Surface
Controlled by
Vulcan Materials Company
Cupertino,
Santa Clara County,
CA
·
Intermittent
MSHA Mine ID: 0405987
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2025
1
citations
0
significant & substantial
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 | 6,448 | 0 | 0 | 0.0 |
| 2025 Q3 | 6,386 | 0 | 0 | 0.0 |
| 2025 Q2 | 5,561 | 1 | 0 | 179.8 |
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.