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

Intermittent Surface SandAndGravel

Operator: Monarch Mountain Minerals & Aggregates

Controller: Quikrete Holdings Inc.

Location: Platteville, Weld County, CO

Employees: 2

11
Violations
7
S&S Violations
0
Accidents
$4K
Penalties

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

MSHA Mine ID0505193
Mine TypeSurface
StatusIntermittent
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees2
Days/Week5.0
Hours/Shift8.0
Coordinates40.3041670, -104.8119440
Nearest TownPlatteville

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.