Cucamonga Creek Mine Metal/Non-Metal
MRC Rock & Sand LLC
· Surface
Controlled by
Roko Grbic; Mile Grbic
Upland,
San Bernardino County,
CA
·
Active
MSHA Mine ID: 0405929
Cucamonga Creek Mine has $9K in proposed MSHA penalties and $1K outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2018
32
citations
10
significant & substantial
$9,211
proposed penalties
$7,726
paid to date
84% of proposed penalties paid to date, a $1,485 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2018
20
inspections on record
281
inspection hours
n/a
citations per 100 inspection hours
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Rate withheld: 281 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Cucamonga Creek Mine has $9K in proposed MSHA penalties and $1K outstanding across 0 contested dockets.
Penalty disposition
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.$9K
proposed penalties
$9K
current assessed
$8K
paid to date
$1K
outstanding
32 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-07-29.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
See also
the operator's enforcement record
Quarterly safety rates
ⓘ
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 1,624 | 0 | 0 | 0.0 |
| 2025 Q3 | 1,061 | 3 | 1 | 2827.5 |
| 2025 Q2 | 1,798 | 0 | 0 | 0.0 |
| 2025 Q1 | 1,995 | 0 | 0 | 0.0 |
| 2024 Q4 | 2,047 | 5 | 2 | 2442.6 |
| 2024 Q3 | 2,492 | 0 | 0 | 0.0 |
| 2024 Q2 | 2,838 | 0 | 0 | 0.0 |
| 2024 Q1 | 2,692 | 3 | 2 | 1114.4 |
Show 21 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2023 Q4 | 2,516 | 0 | 0 | 0.0 |
| 2023 Q3 | 2,019 | 0 | 0 | 0.0 |
| 2023 Q2 | 1,759 | 0 | 0 | 0.0 |
| 2023 Q1 | 1,725 | 0 | 0 | 0.0 |
| 2022 Q4 | 1,550 | 0 | 0 | 0.0 |
| 2022 Q3 | 2,269 | 3 | 0 | 1322.2 |
| 2022 Q2 | 2,325 | 0 | 0 | 0.0 |
| 2022 Q1 | 2,184 | 3 | 0 | 1373.6 |
| 2021 Q4 | 1,546 | 0 | 0 | 0.0 |
| 2021 Q3 | 2,162 | 2 | 1 | 925.1 |
| 2021 Q2 | 2,366 | 2 | 2 | 845.3 |
| 2021 Q1 | 2,218 | 0 | 0 | 0.0 |
| 2020 Q4 | 2,577 | 4 | 1 | 1552.2 |
| 2020 Q3 | 1,625 | 0 | 0 | 0.0 |
| 2020 Q2 | 3,202 | 0 | 0 | 0.0 |
| 2020 Q1 | 2,451 | 2 | 1 | 816.0 |
| 2019 Q4 | 2,106 | 0 | 0 | 0.0 |
| 2019 Q3 | 2,095 | 0 | 0 | 0.0 |
| 2019 Q2 | 2,283 | 0 | 0 | 0.0 |
| 2019 Q1 | 1,197 | 0 | 0 | 0.0 |
| 2018 Q4 | 471 | 5 | 0 | 10615.7 |
No reportable incidents on file.
MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.
For insurers, brokers, and safety consultants
The full compliance file on Cucamonga Creek Mine
A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.