CalMat Co: 26 open mines, 248 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
CalMat Co (MSHA operator ID L16645) operates 26 open mines with 560 employees in California, Arizona, New Mexico, mostly construction sand and gravel. Since January 1, 2022 MSHA inspectors issued it 248 citations and orders with $56,949 in proposed penalties, and it reported 43 injury or illness cases, 1 of them fatal. Data from MSHA, November 6, 2026.
The request: Watch CalMat Co (MSHA operator ID L16645): each new citation, each accident report and each new mine. $10 of work on sign-up, no card.
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- MSHA operator ID
- L16645
- Open mines
- 26
- Employees at open mines
- 560
- States
- California, Arizona, New Mexico
- Parent company
- Vulcan Materials Company
- Citations and orders since January 1, 2022
- 248
- Significant and substantial
- 39 (15.7%)
- Closure orders
- 9
- High negligence or reckless
- 6
- Proposed penalties
- $56,949
- Amount paid so far
- $56,450
- Inspections
- 348
- Inspector hours on site
- 2,805
- Citations per inspection
- 0.71 (all mines 2.30)
- Accident reports
- 44
- Injury and illness cases
- 43
- Fatalities
- 1
- Latest MSHA record
- November 3, 2026
Open mines of CalMat Co
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Pleasanton Plant | CalMat Co | Alameda County, CA | Construction sand and gravel | 52 | 25 |
| West Broadway | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 39 | 23 |
| San Emidio Plant | CalMat Co | Kern County, CA | Construction sand and gravel | 25 | 21 |
| Sanger Plant | CalMat Co | Fresno County, CA | Construction sand and gravel | 18 | 21 |
| Marana Plant | CalMat Co | Pima County, AZ | Construction sand and gravel | 14 | 19 |
| Lexington Quarry | CalMat Co | Santa Clara County, CA | Crushed, broken stone | 4 | 19 |
| Chula Vista Quarry | CalMat Co | San Diego County, CA | Construction sand and gravel | 32 | 16 |
| Lake Herman Quarry | CalMat Co | Solano County, CA | Crushed, broken stone | 68 | 14 |
| Queen Creek Stone | CalMat Co | Pinal County, AZ | Construction sand and gravel | 10 | 9 |
| Pena Blanca | CalMat Co | Sandoval County, NM | Construction sand and gravel | 1 | 9 |
| Napa Quarry | CalMat Co | Napa County, CA | Sand, industrial | 50 | 7 |
| Austin Quarry | CalMat Co | Madera County, CA | Crushed, broken stone | 19 | 7 |
| Placitas | CalMat Co | Sandoval County, NM | Construction sand and gravel | 11 | 7 |
| Avondale Plant | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 0 | 7 |
| San Bernardino Plant | CalMat Co | San Bernardino County, CA | Construction sand and gravel | 24 | 6 |
| West Plant | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 28 | 5 |
| Palmdale Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 15 | 5 |
| Durbin Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 38 | 4 |
| Sun City Plant | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 22 | 4 |
| Val Vista, Citrus Grove 150 | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 6 | 4 |
| Reliance Plant | CalMat Co | Los Angeles County, CA | Construction sand and gravel | 35 | 3 |
| Corona Plant | CalMat Co | Riverside County, CA | Construction sand and gravel | 33 | 3 |
| Cupertino Quarry | CalMat Co | Santa Clara County, CA | Construction sand and gravel | 10 | 1 |
| Baca Pit | CalMat Co | Sandoval County, NM | Construction sand and gravel | 6 | 1 |
| Gila 240 | CalMat Co | Maricopa County, AZ | Construction sand and gravel | 0 | 0 |
| Highway 85 | CalMat Co | Maricopa County, AZ | Not stated | 0 | 0 |
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 |
|---|---|---|---|---|
| 2022 | 51 | 8 | $14,039 | 12 |
| 2023 | 75 | 14 | $18,511 | 10 |
| 2024 | 53 | 9 | $10,450 | 11 |
| 2025 | 38 | 3 | $9,863 | 5 |
| 2026 | 31 | 5 | $4,086 | 5 |
Standards cited most at CalMat Co
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 56.20003 | Surface metal and nonmetal mines | 37 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 10 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 8 |
| 30 CFR 47.41 | Hazard communication | 8 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.16001 | Surface metal and nonmetal mines | 6 |
| 30 CFR 46.9 | Training at sand, gravel and surface stone mines | 6 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 5 |
Injury and illness cases at CalMat Co
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Fatality | 1 |
| Days away from work or restricted activity | 32 |
| No lost time, or an occupational illness | 10 |
What the accident reports at CalMat Co describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 13 |
| Slip or fall of person | 10 |
| Machinery | 6 |
| Powered haulage | 6 |
| Other | 3 |
| Handtools (nonpowered) | 2 |
| Disorders (repeated trauma) | 1 |
| Disorders (physical agents) | 1 |
| Stepping or kneeling on object | 1 |
| Striking or bumping | 1 |
Equipment named in accident reports at CalMat Co
| Equipment | Reports |
|---|---|
| Front-end loader | 6 |
| Bulldozer | 2 |
| Hand tools (not powered) | 2 |
| Welding machine | 2 |
| Trucks | 2 |
| Crane | 1 |
| Crusher | 1 |
| Shovel | 1 |
| Ore haulage trucks - off highway trucks | 1 |
| Hand tools (powered) | 1 |
Commodities
| Main commodity | Open mines |
|---|---|
| Construction sand and gravel | 21 |
| Crushed, broken stone | 3 |
| Sand, industrial | 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.