DENM Metal/Non-Metal
Monarch Mountain Minerals & Aggregates
· Surface
Controlled by
Quikrete Holdings Inc.
Platteville,
Weld County,
CO
·
Active
MSHA Mine ID: 0505193
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- Fatalities
- 0
- Total incidents
- 0
- Years on record
- —
- Latest incident
- —
Compliance record
MSHA citations since 2024
11
citations
7
significant & substantial
$3,784
proposed penalties
$3,784
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 3,637 | 1 | 1 | 275.0 |
| 2025 Q3 | 2,980 | 0 | 0 | 0.0 |
| 2025 Q2 | 3,160 | 0 | 0 | 0.0 |
| 2025 Q1 | 2,426 | 0 | 0 | 0.0 |
| 2024 Q4 | 2,921 | 1 | 0 | 342.3 |
| 2024 Q3 | 2,693 | 9 | 6 | 3342.0 |
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
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.