Key Takeaway
North Stone is a active surface mine producing Stone, located in Maryland Heights, St Louis County, MO. It has 110 violations on record (19 S&S) and $107K in proposed penalties. Operated by New Frontier Materials Operations Alpha, LLC.
North Stone
Operator: New Frontier Materials Operations Alpha, LLC
Controller: RWNIH-OP Holdings LLC; PEPI Capital, L.P.; 42 North Resources Partners I
Location: Maryland Heights, St Louis County, MO
Employees: 50
Recent Violations
View all 110 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 08/14/2025 | 56.5001(a)/.5005 | Non-S&S | ModNegligence | $151 |
| 08/06/2025 | 56.14100(b) | Non-S&S | ModNegligence | $151 |
| 12/23/2024 | 56.11001 | Non-S&S | ModNegligence | $151 |
| 12/23/2024 | 56.14130(c) | Non-S&S | ModNegligence | $151 |
| 12/12/2024 | 56.9300(b) | Non-S&S | ModNegligence | $165 |
| 09/19/2024 | 56.5001(a)/56.5005 | Non-S&S | LowNegligence | $147 |
| 04/25/2024 | 56.14107(a) | Non-S&S | ModNegligence | $161 |
| 11/29/2023 | 56.12032 | Non-S&S | ModNegligence | $155 |
| 06/01/2023 | 56.12032 | Non-S&S | ModNegligence | $143 |
| 05/30/2023 | 47.41(a) | Non-S&S | ModNegligence | $143 |
| 11/15/2022 | 56.16006 | Non-S&S | LowNegligence | $143 |
| 08/31/2022 | 56.14207 | Non-S&S | ModNegligence | $133 |
| 08/31/2022 | 50.30(a) | Non-S&S | HighNegligence | $133 |
| 08/29/2022 | 56.12028 | Non-S&S | ModNegligence | $133 |
| 01/13/2022 | 56.4430(b)(1) | Non-S&S | ModNegligence | $133 |
| 01/13/2022 | 56.14109 | Non-S&S | LowNegligence | $133 |
| 01/13/2022 | 56.14107(a) | Non-S&S | ModNegligence | $133 |
| 01/12/2022 | 56.14100(c) | Non-S&S | LowNegligence | $133 |
| 07/21/2021 | 56.4201(a)(2) | Non-S&S | ModNegligence | $125 |
| 07/21/2021 | 56.4102 | Non-S&S | ModNegligence | $125 |
Accidents & Injuries
View all 73 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 07/30/2025 | HANDTOOLS (NONPOWERED) | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 03/21/2025 | POWERED HAULAGE | DAYS AWAY FROM WORK ONLY | 60d lost |
| 07/31/2024 | MACHINERY | DYS AWY FRM WRK & RESTRCTD ACT | 151d lost, 14d restricted |
| 06/04/2024 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 80d restricted |
| 04/19/2024 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 68d restricted |
| 07/11/2022 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 64d restricted |
| 07/07/2022 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 3d restricted |
| 05/19/2022 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 130d restricted |
| 01/05/2021 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 12/14/2020 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 7d restricted |
Inspections
View all 87 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 03/04/2026 | 0.00 | 0 | |
| 09/16/2025 | 09/18/2025 | 13.25 | 1 |
| 09/03/2025 | 09/03/2025 | 13.00 | 1 |
| 08/27/2025 | 08/28/2025 | 6.00 | 1 |
| 08/05/2025 | 08/07/2025 | 35.25 | 1 |
| 12/12/2024 | 12/30/2024 | 49.25 | 2 |
| 10/28/2024 | 10/28/2024 | 4.50 | 1 |
| 10/15/2024 | 10/16/2024 | 15.25 | 1 |
| 10/10/2024 | 10/11/2024 | 1.00 | 1 |
| 09/19/2024 | 09/19/2024 | 17.50 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does North Stone have?
North Stone has 110 MSHA violations on record, of which 19 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $107K.
What type of mine is North Stone?
North Stone is a Surface mine producing Stone, located in Maryland Heights, St Louis County, MO. It currently has 50 employees.
Has anyone been injured or killed at North Stone?
According to MSHA records, North Stone has 73 reported accident/injury records and 1 fatalities on file.
Who operates North Stone?
North Stone is operated by New Frontier Materials Operations Alpha, LLC and controlled by RWNIH-OP Holdings LLC; PEPI Capital, L.P.; 42 North Resources Partners I. MSHA Mine ID: 2300220.