Key Takeaway
DENM is a intermittent surface mine producing SandAndGravel, located in Platteville, Weld County, CO. It has 11 violations on record (7 S&S) and $4K in proposed penalties. Operated by Monarch Mountain Minerals & Aggregates.
DENM
Operator: Monarch Mountain Minerals & Aggregates
Controller: Quikrete Holdings Inc.
Location: Platteville, Weld County, CO
Employees: 2
Recent Violations
View all 11 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 10/07/2025 | 56.11001 | S&S | ModNegligence | $1,550 |
| 11/26/2024 | 56.20003(a) | Non-S&S | ModNegligence | $147 |
| 09/24/2024 | 56.14109(a) | S&S | ModNegligence | $147 |
| 09/24/2024 | 56.14107(a) | S&S | ModNegligence | $221 |
| 09/24/2024 | 56.11001 | S&S | ModNegligence | $492 |
| 09/23/2024 | 56.14101(a)(3) | Non-S&S | ModNegligence | $147 |
| 09/23/2024 | 56.12032 | S&S | ModNegligence | $492 |
| 09/23/2024 | 56.12013(c) | Non-S&S | ModNegligence | $147 |
| 09/23/2024 | 56.20003(a) | S&S | ModNegligence | $147 |
| 09/23/2024 | 56.9300(a) | S&S | ModNegligence | $147 |
| 07/03/2024 | 56.1000 | Non-S&S | HighNegligence | $147 |
Inspections
View all 5 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 10/07/2025 | 10/08/2025 | 9.75 | 1 |
| 11/26/2024 | 12/03/2024 | 13.00 | 1 |
| 10/07/2024 | 10/07/2024 | 2.75 | 1 |
| 09/23/2024 | 09/24/2024 | 16.00 | 1 |
| 07/03/2024 | 07/10/2024 | 8.75 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does DENM have?
DENM has 11 MSHA violations on record, of which 7 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $4K.
What type of mine is DENM?
DENM is a Surface mine producing SandAndGravel, located in Platteville, Weld County, CO. It currently has 2 employees.
Has anyone been injured or killed at DENM?
According to MSHA records, DENM has 0 reported accident/injury records and 0 fatalities on file.
Who operates DENM?
DENM is operated by Monarch Mountain Minerals & Aggregates and controlled by Quikrete Holdings Inc.. MSHA Mine ID: 0505193.