Key Takeaway
Grayhawk HP 400 is a intermittent surface mine producing SandAndGravel, located in Duluth, St Louis County, MN. It has 17 violations on record (1 S&S) and $2K in proposed penalties. Operated by Mathy Constr. Co. DBA Northland Constrs. of Duluth.
Grayhawk HP 400
Operator: Mathy Constr. Co. DBA Northland Constrs. of Duluth
Controller: Mathy Construction Company
Location: Duluth, St Louis County, MN
Employees: 2
Recent Violations
View all 17 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 07/15/2025 | 56.13015(a) | Non-S&S | LowNegligence | $151 |
| 01/16/2024 | 50.30(a) | Non-S&S | ModNegligence | $147 |
| 07/05/2023 | 56.12004 | Non-S&S | ModNegligence | $143 |
| 07/11/2022 | 56.14100(b) | Non-S&S | LowNegligence | $133 |
| 07/11/2022 | 50.30(a) | Non-S&S | LowNegligence | $133 |
| 07/08/2021 | 56.14100(b) | Non-S&S | LowNegligence | $125 |
| 08/04/2020 | 50.30(a) | Non-S&S | ModNegligence | $123 |
| 08/03/2020 | 56.13015(a) | Non-S&S | LowNegligence | $123 |
| 08/03/2020 | 50.30(a) | Non-S&S | ModNegligence | $123 |
| 08/03/2020 | 56.12028 | Non-S&S | ModNegligence | $123 |
| 11/15/2018 | 56.14107(a) | Non-S&S | LowNegligence | $118 |
| 08/15/2017 | 56.14107(a) | S&S | ModNegligence | $126 |
| 08/15/2017 | 56.11002 | Non-S&S | ModNegligence | $116 |
| 08/15/2017 | 56.14101(a)(2) | Non-S&S | LowNegligence | $116 |
| 08/23/2016 | 56.4201(a)(1) | Non-S&S | ModNegligence | $114 |
| 05/19/2015 | 56.12028 | Non-S&S | LowNegligence | $100 |
| 05/18/2015 | 56.4201(a)(2) | Non-S&S | ModNegligence | $100 |
Inspections
View all 16 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 07/31/2025 | 08/05/2025 | 0.75 | 1 |
| 07/15/2025 | 07/15/2025 | 4.75 | 1 |
| 08/06/2024 | 08/06/2024 | 3.25 | 1 |
| 05/22/2024 | 05/22/2024 | 0.75 | 1 |
| 05/13/2024 | 05/13/2024 | 5.50 | 1 |
| 07/05/2023 | 07/06/2023 | 11.00 | 1 |
| 07/11/2022 | 07/11/2022 | 9.25 | 1 |
| 07/08/2021 | 07/09/2021 | 16.00 | 1 |
| 08/03/2020 | 08/04/2020 | 14.50 | 1 |
| 11/15/2018 | 11/15/2018 | 8.00 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Grayhawk HP 400 have?
Grayhawk HP 400 has 17 MSHA violations on record, of which 1 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $2K.
What type of mine is Grayhawk HP 400?
Grayhawk HP 400 is a Surface mine producing SandAndGravel, located in Duluth, St Louis County, MN. It currently has 2 employees.
Has anyone been injured or killed at Grayhawk HP 400?
According to MSHA records, Grayhawk HP 400 has 0 reported accident/injury records and 0 fatalities on file.
Who operates Grayhawk HP 400?
Grayhawk HP 400 is operated by Mathy Constr. Co. DBA Northland Constrs. of Duluth and controlled by Mathy Construction Company. MSHA Mine ID: 2103843.