Key Takeaway
Clayton Plant is a active surface mine producing Stone, located in CLAYTON, Contra Costa County, CA. It has 173 violations on record (37 S&S) and $77K in proposed penalties. Operated by CEMEX Construction Materials Pacific, LLC.
Clayton Plant
Operator: CEMEX Construction Materials Pacific, LLC
Controller: Cemex S A
Location: CLAYTON, Contra Costa County, CA
Employees: 14
Recent Violations
View all 173 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 10/06/2025 | 56.12032 | Non-S&S | LowNegligence | $151 |
| 07/08/2025 | 46.7(a) | Non-S&S | LowNegligence | $168 |
| 05/28/2024 | 56.20003(a) | Non-S&S | LowNegligence | $147 |
| 10/26/2023 | 56.11002 | Non-S&S | ModNegligence | $143 |
| 10/25/2023 | 56.9300(b) | Non-S&S | ModNegligence | $198 |
| 10/25/2023 | 56.14100(b) | Non-S&S | LowNegligence | $143 |
| 05/03/2023 | 50.30-1(h) | Non-S&S | LowNegligence | $143 |
| 05/03/2023 | 62.130(a) | Non-S&S | ModNegligence | $143 |
| 05/02/2023 | 56.14107(a) | Non-S&S | ModNegligence | $143 |
| 05/02/2023 | 56.12032 | Non-S&S | ModNegligence | $143 |
| 05/02/2023 | 56.14107(a) | Non-S&S | ModNegligence | $143 |
| 05/04/2022 | 56.11001 | Non-S&S | LowNegligence | $133 |
| 05/04/2022 | 56.14107(a) | Non-S&S | ModNegligence | $183 |
| 05/04/2022 | 56.4603 | Non-S&S | LowNegligence | $133 |
| 10/06/2021 | 56.14107(a) | Non-S&S | ModNegligence | $125 |
| 10/05/2021 | 56.4201(a)(2) | Non-S&S | ModNegligence | $125 |
| 10/05/2021 | 56.14101(a)(2) | Non-S&S | ModNegligence | $125 |
| 08/18/2021 | 56.12032 | Non-S&S | LowNegligence | $125 |
| 02/23/2021 | 56.11027 | Non-S&S | ModNegligence | $172 |
| 02/23/2021 | 56.9300(b) | S&S | ModNegligence | $856 |
Accidents & Injuries
View all 21 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 01/23/2024 | MACHINERY | DAYS RESTRICTED ACTIVITY ONLY | 98d restricted |
| 10/23/2023 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 1d lost |
| 09/09/2022 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 199d lost |
| 07/20/2022 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 1d restricted |
| 08/12/2020 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 08/14/2015 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 18d restricted |
| 05/12/2010 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 37d lost, 104d restricted |
| 12/09/2009 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 10d lost, 5d restricted |
| 08/28/2008 | OTHER | DAYS RESTRICTED ACTIVITY ONLY | 16d restricted |
| 08/11/2008 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
Inspections
View all 75 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 10/06/2025 | 10/08/2025 | 26.00 | 1 |
| 07/10/2025 | 07/10/2025 | 1.50 | 1 |
| 07/07/2025 | 07/09/2025 | 24.25 | 1 |
| 10/09/2024 | 10/10/2024 | 14.00 | 1 |
| 05/21/2024 | 05/30/2024 | 5.00 | 1 |
| 10/23/2023 | 11/02/2023 | 65.25 | 2 |
| 08/07/2023 | 08/08/2023 | 12.50 | 1 |
| 05/01/2023 | 05/03/2023 | 25.75 | 1 |
| 12/05/2022 | 12/07/2022 | 18.00 | 1 |
| 05/09/2022 | 05/10/2022 | 2.00 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Clayton Plant have?
Clayton Plant has 173 MSHA violations on record, of which 37 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $77K.
What type of mine is Clayton Plant?
Clayton Plant is a Surface mine producing Stone, located in CLAYTON, Contra Costa County, CA. It currently has 14 employees.
Has anyone been injured or killed at Clayton Plant?
According to MSHA records, Clayton Plant has 21 reported accident/injury records and 0 fatalities on file.
Who operates Clayton Plant?
Clayton Plant is operated by CEMEX Construction Materials Pacific, LLC and controlled by Cemex S A. MSHA Mine ID: 0400173.