Key Takeaway
Cucamonga Creek Mine is a active surface mine producing Nonmetal, located in Upland, San Bernardino County, CA. It has 32 violations on record (10 S&S) and $9K in proposed penalties. Operated by MRC Rock & Sand LLC.
Cucamonga Creek Mine
Operator: MRC Rock & Sand LLC
Controller: Roko Grbic; Mile Grbic
Location: Upland, San Bernardino County, CA
Employees: 4
Recent Violations
View all 32 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 07/29/2025 | 56.3200 | S&S | LowNegligence | $209 |
| 07/29/2025 | 56.4101 | Non-S&S | ModNegligence | $151 |
| 07/16/2025 | 50.30(a) | Non-S&S | HighNegligence | $151 |
| 10/03/2024 | 46.8(a)(1) | Non-S&S | HighNegligence | $164 |
| 10/03/2024 | 56.20003(a) | S&S | LowNegligence | $147 |
| 10/03/2024 | 56.16005 | Non-S&S | LowNegligence | $147 |
| 10/03/2024 | 56.18002(a) | S&S | ModNegligence | $388 |
| 03/19/2024 | 56.14101(a)(3) | S&S | ModNegligence | $388 |
| 03/19/2024 | 46.5(b) | S&S | HighNegligence | $1,321 |
| 03/19/2024 | 46.8 | Non-S&S | HighNegligence | $164 |
| 01/16/2024 | 50.30(a) | Non-S&S | HighNegligence | $147 |
| 07/14/2022 | 56.14207 | Non-S&S | ModNegligence | $133 |
| 07/14/2022 | 56.14107(a) | Non-S&S | HighNegligence | $133 |
| 01/17/2022 | 50.30(a) | Non-S&S | HighNegligence | $133 |
| 01/03/2022 | 56.14101(a)(3) | Non-S&S | HighNegligence | $252 |
| 01/03/2022 | 56.14100(a) | Non-S&S | HighNegligence | $252 |
| 01/03/2022 | 56.12028 | Non-S&S | ModNegligence | $133 |
| 09/27/2021 | 46.9(g) | Non-S&S | HighNegligence | $125 |
| 09/21/2021 | 56.11001 | S&S | HighNegligence | $2,493 |
| 05/19/2021 | 56.14103(a) | S&S | ModNegligence | $146 |
Inspections
View all 20 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 10/06/2025 | 10/06/2025 | 10.00 | 1 |
| 07/28/2025 | 07/30/2025 | 11.50 | 1 |
| 11/06/2024 | 11/07/2024 | 0.50 | 1 |
| 10/03/2024 | 10/08/2024 | 15.50 | 1 |
| 05/22/2024 | 05/22/2024 | 8.00 | 1 |
| 05/22/2024 | 05/22/2024 | 2.25 | 1 |
| 03/18/2024 | 03/19/2024 | 24.75 | 1 |
| 08/17/2023 | 08/21/2023 | 9.00 | 1 |
| 08/17/2023 | 08/21/2023 | 2.25 | 1 |
| 04/26/2023 | 04/26/2023 | 9.50 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Cucamonga Creek Mine have?
Cucamonga Creek Mine has 32 MSHA violations on record, of which 10 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $9K.
What type of mine is Cucamonga Creek Mine?
Cucamonga Creek Mine is a Surface mine producing Nonmetal, located in Upland, San Bernardino County, CA. It currently has 4 employees.
Has anyone been injured or killed at Cucamonga Creek Mine?
According to MSHA records, Cucamonga Creek Mine has 0 reported accident/injury records and 0 fatalities on file.
Who operates Cucamonga Creek Mine?
Cucamonga Creek Mine is operated by MRC Rock & Sand LLC and controlled by Roko Grbic; Mile Grbic. MSHA Mine ID: 0405929.