Data / Mines / California / Cupertino Quarry
Cupertino Quarry: 1 MSHA citation
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Cupertino Quarry is an intermittent construction sand and gravel surface mine in Santa Clara County, California, operated by CalMat Co with 10 employees on MSHA's record (mine ID 0405987). Since January 1, 2022 MSHA inspectors issued 1 citation and orders there with $151 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Cupertino Quarry (MSHA mine ID 0405987) in Santa Clara County, California: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 0405987
- Status
- Intermittent since June 17, 2025
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Santa Clara County, California
- Nearest town
- Cupertino
- Operator
- CalMat Co
- Parent company
- Vulcan Materials Company
- Employees
- 10
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 1
- Significant and substantial
- 0 (0.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $151
- Amount paid so far
- $151
- Inspections
- 3
- Inspector hours on site
- 21
- Citations per inspection
- 0.33 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- November 13, 2025
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2025 | 1 | 0 | $151 | 0 |
Standards cited most at Cupertino Quarry
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 47.41 | Hazard communication | 1 |
Other open mines in Santa Clara County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Stevens Creek Quarry | Stevens Creek Quarry Inc | Santa Clara County, CA | Crushed, broken stone | 56 | 31 |
| Lexington Quarry | CalMat Co | Santa Clara County, CA | Crushed, broken stone | 4 | 19 |
| Permanente Cement Plant & Quarry | Lehigh Southwest Cement Co. | Santa Clara County, CA | Cement | 0 | 16 |
| Curtner Quarry | DeSilva Gates Construction LLC | Santa Clara County, CA | Construction sand and gravel | 5 | 1 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.