Key Takeaway
Irwin Thomas is a intermittent surface mine producing SandAndGravel, located in Longmont, Boulder County, CO. It has 9 violations on record (2 S&S) and $2K in proposed penalties. Operated by Northern Colorado Constructors.
Irwin Thomas
Operator: Northern Colorado Constructors
Controller: George Zadel
Location: Longmont, Boulder County, CO
Employees: 12
Recent Violations
View all 9 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 06/11/2025 | 56.4201(a)(2) | Non-S&S | ModNegligence | $151 |
| 06/11/2025 | 56.14132(a) | Non-S&S | ModNegligence | $151 |
| 06/11/2025 | 56.14132(a) | Non-S&S | ModNegligence | $151 |
| 05/01/2023 | 56.14130(g) | S&S | ModNegligence | $477 |
| 05/01/2023 | 56.4203 | Non-S&S | HighNegligence | $143 |
| 05/01/2023 | 46.6(a) | S&S | ModNegligence | $173 |
| 05/01/2023 | 46.12(a)(2) | Non-S&S | ModNegligence | $143 |
| 05/01/2023 | 56.18002 | Non-S&S | ModNegligence | $143 |
| 05/01/2023 | 56.14101(a)(2) | Non-S&S | ModNegligence | $143 |
Inspections
View all 5 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 07/10/2025 | 07/10/2025 | 3.00 | 1 |
| 06/16/2025 | 06/16/2025 | 5.00 | 1 |
| 06/11/2025 | 06/11/2025 | 16.00 | 1 |
| 09/10/2024 | 09/11/2024 | 23.00 | 1 |
| 05/01/2023 | 05/05/2023 | 13.50 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Irwin Thomas have?
Irwin Thomas has 9 MSHA violations on record, of which 2 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $2K.
What type of mine is Irwin Thomas?
Irwin Thomas is a Surface mine producing SandAndGravel, located in Longmont, Boulder County, CO. It currently has 12 employees.
Has anyone been injured or killed at Irwin Thomas?
According to MSHA records, Irwin Thomas has 0 reported accident/injury records and 0 fatalities on file.
Who operates Irwin Thomas?
Irwin Thomas is operated by Northern Colorado Constructors and controlled by George Zadel. MSHA Mine ID: 0505167.