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

Active Surface 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

110
Violations
19
S&S Violations
73
Accidents
$107K
Penalties

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

MSHA Mine ID2300220
Mine TypeSurface
StatusActive
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees50
Days/Week5.0
Hours/Shift8.0
Coordinates38.7411110, -90.4686110
Nearest TownMaryland Heights

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.