Data / Mines / California / Clayton Plant
Clayton Plant: 15 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Clayton Plant is an active crushed, broken stone surface mine in Contra Costa County, California, operated by Cemex Construction Materials Pacific, LLC with 14 employees on MSHA's record (mine ID 0400173). Since January 1, 2022 MSHA inspectors issued 15 citations and orders there with $2,265 in proposed penalties, and 4 accident reports were filed there, with 4 injury or illness cases.
The request: Watch Clayton Plant (MSHA mine ID 0400173) in Contra Costa County, California: each new citation and each accident report. $10 of work on sign-up, no card.
SpecStream is the live web data engine for teams and agents. It reads the mine, citation, inspection and accident files that MSHA publishes, and this page is that reading. Ask for the mines of a commodity, state or operator with the operator's headquarters, website and size added from the web, and new mines, new citations and new accident reports arrive in your sheet, CRM, Slack or agent as MSHA posts them.
- MSHA mine ID
- 0400173
- Status
- Active since April 26, 1973
- Main commodity
- Crushed, broken stone
- Mine type
- Surface
- County
- Contra Costa County, California
- Nearest town
- Clayton
- Operator
- Cemex Construction Materials Pacific, LLC
- Parent company
- Cemex S a
- Employees
- 14
- MSHA field office
- Vacaville CA Field Office
- Citations and orders since January 1, 2022
- 15
- Significant and substantial
- 0 (0.0%)
- Closure orders
- 1
- High negligence or reckless
- 0
- Proposed penalties
- $2,265
- Amount paid so far
- $2,114
- Inspections
- 12
- Inspector hours on site
- 139
- Citations per inspection
- 1.25 (all mines 2.30)
- Accident reports
- 4
- Injury and illness cases
- 4
- Fatalities
- 0
- Latest MSHA record
- August 5, 2026
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 | 3 | 0 | $449 | 2 |
| 2023 | 8 | 0 | $1,199 | 1 |
| 2024 | 1 | 0 | $147 | 1 |
| 2025 | 2 | 0 | $319 | 0 |
| 2026 | 1 | 0 | $151 | 0 |
Standards cited most at Clayton Plant
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 56.14107 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
| 30 CFR 50.30-1 | Reporting of accidents, injuries and illnesses | 1 |
| 30 CFR 62.130 | Occupational noise exposure | 1 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4603 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 1 |
| 30 CFR 46.7 | Training at sand, gravel and surface stone mines | 1 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Clayton Plant
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 4 |
What the accident reports at Clayton Plant describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 2 |
| Machinery | 1 |
| Slip or fall of person | 1 |
Equipment named in accident reports at Clayton Plant
| Equipment | Reports |
|---|---|
| Trucks | 1 |
| Blow pipe | 1 |
Other open mines in Contra Costa County, California
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| G3 Enterprises Byron Plant | G3 Enterprises, Inc. | Contra Costa County, CA | Construction sand and gravel | 21 | 44 |
| Clayton Aggregates | Martin Marietta Northern California Aggregates,LLC | Contra Costa County, CA | Crushed, broken stone | 15 | 15 |
| Kellog Creek Aggregates Inc | Kellog Creek Aggregates Inc | Contra Costa County, CA | Construction sand and gravel | 5 | 4 |
| Sand Merchant | Foss Maritime Company | Contra Costa County, CA | Sand, common | 12 | 2 |
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.