Stamper Underground
NonProducing
Underground
Stone
Operator: Martin Marietta Kansas City, LLC
Controller: Martin Marietta Materials Inc
Location: Platte City, Platte County, MO
Employees: 4
391
Violations
115
S&S Violations
23
Accidents
$156K
Penalties
Recent Violations
View all 391 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 06/09/2025 | 58.620 | Non-S&S | ModNegligence | $151 |
| 04/02/2025 | 57.4200(b)(2) | Non-S&S | LowNegligence | $151 |
| 04/02/2025 | 57.12068 | Non-S&S | ModNegligence | $226 |
| 08/28/2024 | 57.18010 | Non-S&S | LowNegligence | $147 |
| 03/15/2024 | Non-S&S | $0 | ||
| 02/07/2024 | 57.14132(a) | Non-S&S | LowNegligence | $147 |
| 12/07/2023 | 57.14100(b) | Non-S&S | LowNegligence | $147 |
| 07/26/2023 | 57.14132(a) | Non-S&S | LowNegligence | $143 |
| 07/25/2023 | 57.16006 | Non-S&S | LowNegligence | $143 |
| 05/23/2023 | Non-S&S | $0 | ||
| 05/23/2023 | 57.15005 | S&S | ModNegligence | $4,599 |
| 05/23/2023 | 57.14100(b) | Non-S&S | ModNegligence | $167 |
| 05/23/2023 | 57.14100(b) | Non-S&S | ModNegligence | $167 |
| 05/22/2023 | 57.3200 | Non-S&S | ModNegligence | $143 |
| 02/07/2023 | 57.8529 | Non-S&S | ModNegligence | $252 |
| 02/07/2023 | 57.14112(b) | Non-S&S | LowNegligence | $143 |
| 11/22/2022 | 57.6132(b) | Non-S&S | LowNegligence | $143 |
| 11/21/2022 | 57.4501 | Non-S&S | LowNegligence | $143 |
| 08/23/2022 | 57.3200 | S&S | ModNegligence | $987 |
| 05/17/2022 | 57.4203 | Non-S&S | LowNegligence | $133 |
Accidents & Injuries
View all 23 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 05/19/2025 | FIRE | ACCIDENT ONLY | None |
| 03/15/2024 | FALL OF ROOF OR BACK | ACCIDENT ONLY | None |
| 11/11/2020 | MACHINERY | DAYS AWAY FROM WORK ONLY | 16d lost |
| 07/28/2020 | FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL | DAYS RESTRICTED ACTIVITY ONLY | 7d restricted |
| 06/11/2020 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 83d restricted |
| 06/30/2018 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 78d lost |
| 08/21/2017 | INUNDATION | ACCIDENT ONLY | None |
| 07/12/2017 | DISORDERS (PHYSICAL AGENTS) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
| 12/22/2009 | HANDTOOLS (NONPOWERED) | DAYS RESTRICTED ACTIVITY ONLY | 42d restricted |
| 10/10/2006 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 205 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/05/2026 | 01/06/2026 | 5.00 | 1 |
| 01/05/2026 | 01/07/2026 | 13.00 | 1 |
| 12/07/2025 | 12/08/2025 | 11.25 | 1 |
| 11/24/2025 | 11/25/2025 | 10.00 | 1 |
| 11/17/2025 | 11/17/2025 | 9.50 | 1 |
| 09/09/2025 | 09/09/2025 | 6.25 | 1 |
| 08/06/2025 | 08/07/2025 | 14.25 | 1 |
| 06/09/2025 | 06/11/2025 | 9.00 | 1 |
| 05/20/2025 | 05/27/2025 | 17.75 | 1 |
| 04/29/2025 | 04/29/2025 | 5.75 | 1 |
Mine Details
MSHA Mine ID2302232
Mine TypeUnderground
StatusNonProducing
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees4
Days/Week5.0
Hours/Shift0.0
Coordinates39.3466670, -94.6802780
Nearest TownPlatte City
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Frequently Asked Questions
How many MSHA violations does Stamper Underground have?
Stamper Underground has 391 MSHA violations on record, of which 115 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $156K.
What type of mine is Stamper Underground?
Stamper Underground is a Underground mine producing Stone, located in Platte City, Platte County, MO. It currently has 4 employees.
Has anyone been injured or killed at Stamper Underground?
According to MSHA records, Stamper Underground has 23 reported accident/injury records and 1 fatalities on file.
Who operates Stamper Underground?
Stamper Underground is operated by Martin Marietta Kansas City, LLC and controlled by Martin Marietta Materials Inc. MSHA Mine ID: 2302232.