Key Takeaway
Rialto is a active surface mine producing SandAndGravel, located in Rialto, San Bernardino County, CA. It has 210 violations on record (49 S&S) and $73K in proposed penalties. Operated by Robertson's.
Rialto
Operator: Robertson's
Controller: RRM Development Corporation; Mitsubishi Corp
Location: Rialto, San Bernardino County, CA
Employees: 28
Recent Violations
View all 210 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 09/08/2025 | 56.12004 | Non-S&S | LowNegligence | $151 |
| 01/15/2025 | 56.14100(a) | S&S | LowNegligence | $313 |
| 07/06/2023 | 56.12032 | Non-S&S | LowNegligence | $143 |
| 12/21/2021 | 56.20003(a) | Non-S&S | LowNegligence | $133 |
| 12/21/2021 | 56.4101 | Non-S&S | LowNegligence | $133 |
| 07/14/2021 | 56.14132(a) | Non-S&S | LowNegligence | $125 |
| 07/13/2021 | 56.14112(b) | Non-S&S | LowNegligence | $125 |
| 11/12/2020 | 56.14100(b) | Non-S&S | LowNegligence | $123 |
| 11/10/2020 | 56.12032 | S&S | LowNegligence | $254 |
| 11/10/2020 | 56.20003(a) | Non-S&S | ModNegligence | $123 |
| 05/11/2020 | 56.4101 | Non-S&S | LowNegligence | $123 |
| 05/11/2020 | 56.4201(a)(5) | Non-S&S | ModNegligence | $123 |
| 11/06/2019 | 56.11001 | S&S | LowNegligence | $270 |
| 11/06/2019 | 47.41(a) | Non-S&S | LowNegligence | $121 |
| 11/06/2019 | 56.20003(a) | Non-S&S | LowNegligence | $121 |
| 05/09/2019 | 56.16006 | Non-S&S | LowNegligence | $121 |
| 05/09/2019 | 56.14100(b) | Non-S&S | LowNegligence | $121 |
| 12/20/2018 | 56.12030 | Non-S&S | LowNegligence | $121 |
| 12/20/2018 | 56.14100(b) | Non-S&S | ModNegligence | $121 |
| 12/20/2018 | 56.4101 | Non-S&S | ModNegligence | $121 |
Accidents & Injuries
View all 14 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 10/17/2025 | STRIKING OR BUMPING | DAYS AWAY FROM WORK ONLY | None |
| 12/23/2019 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 1d restricted |
| 04/18/2018 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 1d lost |
| 07/12/2016 | HANDTOOLS (NONPOWERED) | DAYS AWAY FROM WORK ONLY | 242d lost |
| 12/28/2015 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 4d restricted |
| 11/02/2015 | POWERED HAULAGE | DYS AWY FRM WRK & RESTRCTD ACT | 3d lost, 12d restricted |
| 06/23/2011 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 1d restricted |
| 05/11/2009 | EXPLOSIVES AND BREAKING AGENTS | DYS AWY FRM WRK & RESTRCTD ACT | 143d lost, 17d restricted |
| 11/27/2007 | POWERED HAULAGE | DAYS AWAY FROM WORK ONLY | 29d lost |
| 07/13/2006 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 1d lost |
Inspections
View all 79 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/03/2026 | 02/09/2026 | 22.00 | 1 |
| 09/08/2025 | 09/09/2025 | 12.75 | 1 |
| 01/14/2025 | 01/16/2025 | 12.00 | 1 |
| 05/21/2024 | 05/21/2024 | 0.50 | 1 |
| 05/20/2024 | 05/21/2024 | 11.00 | 1 |
| 10/04/2023 | 10/04/2023 | 1.75 | 1 |
| 10/03/2023 | 10/04/2023 | 25.25 | 1 |
| 07/06/2023 | 07/07/2023 | 12.00 | 1 |
| 04/11/2023 | 04/11/2023 | 9.00 | 1 |
| 05/02/2022 | 05/03/2022 | 15.00 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Rialto have?
Rialto has 210 MSHA violations on record, of which 49 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $73K.
What type of mine is Rialto?
Rialto is a Surface mine producing SandAndGravel, located in Rialto, San Bernardino County, CA. It currently has 28 employees.
Has anyone been injured or killed at Rialto?
According to MSHA records, Rialto has 14 reported accident/injury records and 0 fatalities on file.
Who operates Rialto?
Rialto is operated by Robertson's and controlled by RRM Development Corporation; Mitsubishi Corp. MSHA Mine ID: 0405392.