Key Takeaway
Iron Mountain is a active surface mine producing Stone, located in Iron Mountain, St Francois County, MO. It has 103 violations on record (20 S&S) and $15K in proposed penalties. Operated by New Frontier Materials Operations Beta, LLC.
Iron Mountain
Operator: New Frontier Materials Operations Beta, LLC
Controller: RWNIH-OP Holdings LLC; PEPI Capital, L.P.; 42 North Resources Partners I
Location: Iron Mountain, St Francois County, MO
Employees: 31
Recent Violations
View all 103 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/13/2026 | 56.14100(b) | Non-S&S | ModNegligence | $226 |
| 01/13/2026 | 56.12006 | Non-S&S | ModNegligence | $151 |
| 06/04/2025 | 56.12004 | Non-S&S | ModNegligence | $151 |
| 06/04/2025 | 56.12032 | Non-S&S | ModNegligence | $151 |
| 06/04/2025 | 56.14109(a) | Non-S&S | ModNegligence | $151 |
| 06/03/2025 | 56.13001 | Non-S&S | LowNegligence | $151 |
| 06/03/2025 | 56.14100(b) | Non-S&S | ModNegligence | $151 |
| 02/27/2025 | 56.12004 | Non-S&S | ModNegligence | $151 |
| 02/27/2025 | 47.44(b) | Non-S&S | ModNegligence | $151 |
| 07/11/2024 | 56.12004 | Non-S&S | ModNegligence | $147 |
| 07/11/2024 | 56.12028 | Non-S&S | ModNegligence | $147 |
| 07/11/2024 | 56.4200(b)(1) | Non-S&S | LowNegligence | $147 |
| 12/06/2023 | 56.12028 | Non-S&S | ModNegligence | $147 |
| 12/06/2023 | 56.4201(a)(1) | Non-S&S | ModNegligence | $147 |
| 12/06/2023 | 56.14100(b) | Non-S&S | ModNegligence | $147 |
| 12/06/2023 | 56.4201(a)(1) | Non-S&S | ModNegligence | $147 |
| 12/06/2023 | 56.14100(b) | S&S | LowNegligence | $147 |
| 07/05/2023 | 56.14112(b) | Non-S&S | LowNegligence | $143 |
| 07/05/2023 | 56.14100(b) | Non-S&S | ModNegligence | $143 |
| 07/05/2023 | 56.14107(a) | Non-S&S | ModNegligence | $143 |
Accidents & Injuries
View all 39 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 07/01/2025 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 06/11/2025 | OTHER | DAYS RESTRICTED ACTIVITY ONLY | 5d restricted |
| 05/19/2025 | POWERED HAULAGE | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 05/14/2024 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 6d restricted |
| 02/15/2024 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 3d restricted |
| 08/26/2021 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 07/23/2021 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/03/2021 | POWERED HAULAGE | DAYS RESTRICTED ACTIVITY ONLY | 6d restricted |
| 08/05/2020 | MACHINERY | DAYS RESTRICTED ACTIVITY ONLY | 39d restricted |
| 09/17/2019 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 77d restricted |
Inspections
View all 74 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/12/2026 | 01/15/2026 | 31.00 | 1 |
| 08/27/2025 | 08/28/2025 | 3.50 | 1 |
| 06/02/2025 | 06/09/2025 | 44.00 | 2 |
| 02/24/2025 | 02/28/2025 | 20.50 | 1 |
| 07/11/2024 | 07/12/2024 | 23.75 | 1 |
| 05/22/2024 | 05/22/2024 | 1.00 | 1 |
| 12/06/2023 | 12/07/2023 | 16.25 | 1 |
| 08/16/2023 | 08/17/2023 | 13.25 | 1 |
| 07/03/2023 | 07/06/2023 | 20.00 | 1 |
| 05/17/2023 | 05/17/2023 | 1.50 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Iron Mountain have?
Iron Mountain has 103 MSHA violations on record, of which 20 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $15K.
What type of mine is Iron Mountain?
Iron Mountain is a Surface mine producing Stone, located in Iron Mountain, St Francois County, MO. It currently has 31 employees.
Has anyone been injured or killed at Iron Mountain?
According to MSHA records, Iron Mountain has 39 reported accident/injury records and 0 fatalities on file.
Who operates Iron Mountain?
Iron Mountain is operated by New Frontier Materials Operations Beta, LLC and controlled by RWNIH-OP Holdings LLC; PEPI Capital, L.P.; 42 North Resources Partners I. MSHA Mine ID: 2300210.