Data / Mines / Missouri / Stamper Underground
Stamper Underground: 23 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Stamper Underground is a nonproducing crushed, broken limestone underground mine in Platte County, Missouri, operated by Hunt Martin Materials L.L.C. with 1 employee on MSHA's record (mine ID 2302232). Since January 1, 2022 MSHA inspectors issued 23 citations and orders there with $8,772 in proposed penalties, and 2 accident reports were filed there, with no injury or illness cases.
The request: Watch Stamper Underground (MSHA mine ID 2302232) in Platte County, Missouri: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 2302232
- Status
- NonProducing since March 18, 2024
- Main commodity
- Crushed, broken limestone
- Mine type
- Underground
- County
- Platte County, Missouri
- Nearest town
- Platte City
- Operator
- Hunt Martin Materials L.L.C.
- Parent company
- Martin Marietta Materials Inc
- Employees
- 1
- MSHA field office
- Rolla MO Field Office
- Citations and orders since January 1, 2022
- 23
- Significant and substantial
- 2 (8.7%)
- Closure orders
- 2
- High negligence or reckless
- 0
- Proposed penalties
- $8,772
- Amount paid so far
- $5,100
- Inspections
- 50
- Inspector hours on site
- 343
- Citations per inspection
- 0.46 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- October 5, 2026
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 7 | 1 | $2,046 | 0 |
| 2023 | 10 | 1 | $5,904 | 0 |
| 2024 | 3 | 0 | $294 | 0 |
| 2025 | 3 | 0 | $528 | 0 |
Standards cited most at Stamper Underground
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 57.14100 | Underground metal and nonmetal mines | 3 |
| 30 CFR 57.14132 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.3200 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.8529 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.14112 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.4201 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.4104 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.19023 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.4200 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.12068 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.4203 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.15005 | Underground metal and nonmetal mines | 1 |
| 30 CFR 58.620 | Part 58 | 1 |
| 30 CFR 57.16006 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.18010 | Underground metal and nonmetal mines | 1 |
What the accident reports at Stamper Underground describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Fire | 1 |
| Fall of roof or back | 1 |
Equipment named in accident reports at Stamper Underground
| Equipment | Reports |
|---|---|
| Shovel | 1 |
Other open mines in Platte County, Missouri
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Buildex | Martin Marietta Materials, Inc. | Platte County, MO | Common shale | 26 | 38 |
| Riverside Plant #11 | Holliday Sand & Gravel Company, Inc. | Platte County, MO | Construction sand and gravel | 9 | 0 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.