Key Takeaway
El Cajon Quarry is a active surface mine producing Stone, located in San Diego, San Diego County, CA. It has 131 violations on record (43 S&S) and $68K in proposed penalties. Operated by Robertson's Ready Mix Ltd.
El Cajon Quarry
Operator: Robertson's Ready Mix Ltd
Controller: RRM Development Corporation; Mitsubishi Corp
Location: San Diego, San Diego County, CA
Employees: 5
Recent Violations
View all 131 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/10/2026 | 47.41(a) | Non-S&S | ModNegligence | $0 |
| 02/10/2026 | 56.15004 | S&S | ModNegligence | $0 |
| 04/03/2025 | 46.7(a) | Non-S&S | LowNegligence | $168 |
| 03/06/2025 | 56.12004 | Non-S&S | LowNegligence | $151 |
| 03/06/2025 | 56.11012 | S&S | ModNegligence | $226 |
| 03/06/2025 | 56.12032 | Non-S&S | ModNegligence | $151 |
| 03/06/2025 | 56.14207 | Non-S&S | LowNegligence | $151 |
| 03/06/2025 | 56.14100(a) | S&S | LowNegligence | $336 |
| 03/06/2025 | 56.12002 | Non-S&S | ModNegligence | $151 |
| 03/06/2025 | 56.14112(b) | Non-S&S | LowNegligence | $151 |
| 05/01/2024 | 56.20003(a) | Non-S&S | ModNegligence | $147 |
| 01/31/2024 | 56.20003(a) | S&S | ModNegligence | $1,287 |
| 01/31/2024 | 56.20014 | Non-S&S | LowNegligence | $147 |
| 07/19/2023 | 56.12008 | Non-S&S | LowNegligence | $155 |
| 07/19/2023 | 56.18002(a) | Non-S&S | HighNegligence | $12,684 |
| 07/18/2023 | 56.12004 | Non-S&S | LowNegligence | $155 |
| 07/18/2023 | 56.11001 | S&S | LowNegligence | $518 |
| 03/14/2023 | 56.12004 | Non-S&S | LowNegligence | $143 |
| 03/14/2023 | 56.14112(a)(1) | S&S | LowNegligence | $143 |
| 03/14/2023 | 56.14112(b) | S&S | LowNegligence | $295 |
Accidents & Injuries
View all 18 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 05/14/2024 | HANDLING OF MATERIALS | DYS AWY FRM WRK & RESTRCTD ACT | 1d lost, 8d restricted |
| 01/20/2024 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/16/2023 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 04/18/2022 | MACHINERY | DAYS AWAY FROM WORK ONLY | 1d lost |
| 02/14/2022 | STEPPING OR KNEELING ON OBJECT | DAYS RESTRICTED ACTIVITY ONLY | 6d restricted |
| 12/07/2021 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 5d lost |
| 09/24/2021 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | None |
| 07/31/2021 | HANDTOOLS (NONPOWERED) | DYS AWY FRM WRK & RESTRCTD ACT | 2d lost, 9d restricted |
| 03/11/2021 | HANDLING OF MATERIALS | DYS AWY FRM WRK & RESTRCTD ACT | 50d lost, 93d restricted |
| 12/28/2020 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 80 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/09/2026 | 02/10/2026 | 17.75 | 1 |
| 04/03/2025 | 04/03/2025 | 10.50 | 1 |
| 03/05/2025 | 03/07/2025 | 41.50 | 1 |
| 04/30/2024 | 05/02/2024 | 27.50 | 1 |
| 01/31/2024 | 02/01/2024 | 17.00 | 1 |
| 07/19/2023 | 07/19/2023 | 0.75 | 1 |
| 07/17/2023 | 07/19/2023 | 26.25 | 1 |
| 03/13/2023 | 03/15/2023 | 20.50 | 1 |
| 09/13/2022 | 09/14/2022 | 15.75 | 1 |
| 08/09/2022 | 08/10/2022 | 13.25 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does El Cajon Quarry have?
El Cajon Quarry has 131 MSHA violations on record, of which 43 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $68K.
What type of mine is El Cajon Quarry?
El Cajon Quarry is a Surface mine producing Stone, located in San Diego, San Diego County, CA. It currently has 5 employees.
Has anyone been injured or killed at El Cajon Quarry?
According to MSHA records, El Cajon Quarry has 18 reported accident/injury records and 0 fatalities on file.
Who operates El Cajon Quarry?
El Cajon Quarry is operated by Robertson's Ready Mix Ltd and controlled by RRM Development Corporation; Mitsubishi Corp. MSHA Mine ID: 0400133.