Mining Incidents

Stamper Underground Metal/Non-Metal

Platte City, Platte County, MO  ·  NonProducing
MSHA Mine ID: 2302232

Stamper Underground has $156K in proposed MSHA penalties and $0 outstanding across 16 contested dockets, plus health sampling and the full incident record.

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Fatalities
1
Total incidents
23
Years on record
2003–2025
Latest incident
May 2025
Compliance record
MSHA citations since 2001
391
citations
115
significant & substantial
$156,488
proposed penalties
$138,248
paid to date
88% of proposed penalties paid to date, a $18,240 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2001
208
inspections on record
5,684
inspection hours
6.9
citations per 100 inspection hours
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.
391 citations across 5,684 inspection hours.
Source: MSHA inspections data, updated weekly.

Stamper Underground has $156K in proposed MSHA penalties and $0 outstanding across 16 contested dockets.

Penalty disposition
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$156K
proposed penalties
$138K
current assessed
$138K
paid to date
$0
outstanding
383 assessments are final orders; 16 contested dockets.
As of the most recent assessment on 2025-06-09.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Quarterly safety rates
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2025 Q4 2,819 0 0 0.0
2025 Q3 4,309 0 0 0.0
2025 Q2 4,049 3 0 740.9
2025 Q1 1,367 0 0 0.0
2024 Q4 2,010 0 0 0.0
2024 Q3 2,121 1 0 471.5
2024 Q2 6,337 0 0 0.0
2024 Q1 34,436 2 0 58.1
Show 91 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 39,026 1 0 25.6
2023 Q3 40,163 2 0 49.8
2023 Q2 36,581 5 1 136.7
2023 Q1 34,909 2 0 57.3
2022 Q4 34,856 2 0 57.4
2022 Q3 39,311 1 1 25.4
2022 Q2 32,999 1 0 30.3
2022 Q1 28,880 3 0 103.9
2021 Q4 33,914 2 0 59.0
2021 Q3 32,174 7 0 217.6
2021 Q2 30,338 2 0 65.9
2021 Q1 27,061 6 1 221.7
2020 Q4 32,279 8 5 247.8
2020 Q3 28,178 18 7 638.8
2020 Q2 26,484 1 0 37.8
2020 Q1 23,961 6 2 250.4
2019 Q4 28,570 3 0 105.0
2019 Q3 29,292 4 0 136.6
2019 Q2 23,454 6 2 255.8
2019 Q1 19,630 1 0 50.9
2018 Q4 22,975 0 0 0.0
2018 Q3 28,631 7 2 244.5
2018 Q2 32,212 2 0 62.1
2018 Q1 33,042 8 2 242.1
2017 Q4 32,971 4 1 121.3
2017 Q3 12,917 5 0 387.1
2017 Q2 31,035 1 1 32.2
2017 Q1 28,816 6 2 208.2
2016 Q4 24,365 6 2 246.3
2016 Q3 25,835 2 1 77.4
2016 Q2 25,514 1 0 39.2
2016 Q1 28,305 2 0 70.7
2015 Q4 24,167 4 2 165.5
2015 Q3 22,120 2 0 90.4
2015 Q2 23,135 2 1 86.4
2015 Q1 22,810 7 4 306.9
2014 Q4 28,632 2 1 69.9
2014 Q3 28,311 4 2 141.3
2014 Q2 20,194 7 2 346.6
2014 Q1 17,358 7 4 403.3
2013 Q4 19,635 9 1 458.4
2013 Q3 18,833 3 1 159.3
2013 Q2 15,263 1 1 65.5
2013 Q1 12,851 3 1 233.4
2012 Q4 12,814 2 1 156.1
2012 Q3 15,656 0 0 0.0
2012 Q2 19,087 3 0 157.2
2012 Q1 17,887 1 1 55.9
2011 Q4 17,920 4 1 223.2
2011 Q3 18,951 3 1 158.3
2011 Q2 16,779 4 2 238.4
2011 Q1 15,969 4 1 250.5
2010 Q4 18,811 6 1 319.0
2010 Q3 17,501 1 0 57.1
2010 Q2 16,936 2 0 118.1
2010 Q1 16,761 7 2 417.6
2009 Q4 20,661 3 2 145.2
2009 Q3 19,929 4 2 200.7
2009 Q2 17,238 18 8 1044.2
2009 Q1 14,870 7 2 470.7
2008 Q4 14,579 6 0 411.6
2008 Q3 13,976 6 1 429.3
2008 Q2 15,059 1 1 66.4
2008 Q1 14,954 7 3 468.1
2007 Q4 16,452 4 2 243.1
2007 Q3 15,376 6 3 390.2
2007 Q2 18,477 6 0 324.7
2007 Q1 15,376 4 0 260.1
2006 Q4 22,305 11 3 493.2
2006 Q3 23,806 11 4 462.1
2006 Q2 21,836 3 0 137.4
2006 Q1 21,225 1 1 47.1
2005 Q4 25,051 3 2 119.8
2005 Q3 26,176 8 2 305.6
2005 Q2 19,652 5 1 254.4
2005 Q1 15,023 5 4 332.8
2004 Q4 5,505 18 4 3269.8
2004 Q3 2,409 7 2 2905.8
2004 Q2 3,040 1 1 328.9
2004 Q1 2,754 1 0 363.1
2003 Q4 4,653 3 2 644.7
2003 Q3 5,729 1 0 174.6
2003 Q2 621 2 0 3220.6
2003 Q1 1,256 0 0 0.0
2002 Q4 2,644 4 1 1512.9
2002 Q3 1,871 4 1 2137.9
2002 Q2 1,669 4 0 2396.6
2002 Q1 1,450 2 0 1379.3
2001 Q4 1,317 4 1 3037.2
2001 Q3 2,393 2 2 835.8
2001 Q2 2,045 0 0 0.0

Fatalities at this mine

1 recorded
September 28, 2005 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech Fatality · POWERED HAULAGE
Martin Marietta Kansas City, LLC · Struck against stationary object

Employee was driving a Superior Bowen's (Contractor) water truck down the slope into mine and lost control, impacting a dome out (located at 2N- 0 E/W) at the bottom of slope resulting in ramping up of truck over and through to other side.

Reportable incidents

22 on file (excluding fatalities above)

2025 · 1 incident

May 19, 2025 MO · Metal/Non-Metal FIRE
Martin Marietta Kansas City, LLC · Accident type, without injuries

Employees arrived for the shift to find a backhoe on fire. Cause of fire was determined to be a lightning strike.

2024 · 1 incident

2020 · 3 incidents

November 11, 2020 MO · Metal/Non-Metal superintendent MACHINERY
Martin Marietta Kansas City, LLC · Absorption of radiations, caustics, toxic and noxious substances

Taking hose off of packer while pressure was still up. Hose disconnected and hit employee in face blowing employee's safety glasses off causing chemical grout to blow into both eyes.

June 11, 2020 MO · Metal/Non-Metal truck driver HANDLING OF MATERIALS
Martin Marietta Kansas City, LLC · Over-exertion (Not Elsewhere Classified)

An employee was assisting with the removal of a guard and lost balance, the injured employee attempted to stabilize the co-worker and injured EE's bicep in the process.

2018 · 1 incident

June 30, 2018 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Martin Marietta Kansas City, LLC · Fall from machine

Employee was performing maintenance on a crusher. A chain used during the work shifted, startling the employee causing EE to lose balance and fall. Impact of the fall resulted in three stitches to EE's elbow.

2017 · 2 incidents

August 21, 2017 MO · Metal/Non-Metal INUNDATION
Martin Marietta Kansas City, LLC · Accident type, without injuries

A record rainfall of 6.14", the largest amount of rain in one day since the construction of the Stamper Mine portal, resulted in the mine's intake lake releasing water. Water traveled down the slope and into a localized area of the mine. We do not believe that this event is "an unplanned inundation of a mine by a liquid" and are submitting the 7000-1 at MSHA's direction.

July 12, 2017 MO · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver DISORDERS (PHYSICAL AGENTS)
Martin Marietta Kansas City, LLC · Contact with heat

Employee was assisting with the clean-up of a conveyor when EE reported EE felt hot and dizzy. Employee cooled off in air conditioning and drank some water. After resting for around 30 minutes employee was still complaining so emergency services were contacted. EMS transported employee to an emergency room where EE received IV fluids and was released to full duty the same day.

2009 · 1 incident

December 22, 2009 MO · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDTOOLS (NONPOWERED)
Martin Marietta Kansas City, LLC · Struck by... (Not Elsewhere Classified)

EE was helping two other employees tension cable bolts using a hydraulic tensioner. The cable was bent and had bound inside the tensioner. A 4 lb hammer was being used to the knock down on the top of the tensioner as EE pulled downward on the tensioner handles. On the 3rd or 4th hit, the hammer deflected off and struck the employees finger.

2006 · 1 incident

October 10, 2006 MO · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey HANDLING OF MATERIALS
Martin Marietta Kansas City, LLC · Struck by falling object

Employee was loading anfo into one of the top holes of a heading being loaded. He was trying to insert the hose further into the hole by wiggiling it. While doing this the hose became caught. As he tried to free the hose he knocked a rock loose which fell and strugk his left forearm. The cut required stitches.

2005 · 2 incidents

September 6, 2005 MO · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger HANDLING OF MATERIALS
Martin Marietta Kansas City, LLC · Caught in, under or between a moving and a stationary object

Employee was exiting his Toro piece of mobile and caught his left hand pointer finger in the door. The pinching action resulted in a laceration that required 7 stitches.

June 22, 2005 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Martin Marietta Kansas City, LLC · Caught in, under or between a moving and a stationary object

The employee was performing maintenance on pins that connect a tilt cylinder. The equipment shifted and pinched his left hand ring finger from the 2nd knuckle out.

2004 · 8 incidents

December 28, 2004 MO · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey STEPPING OR KNEELING ON OBJECT
Hunt Midwest Mining Inc · Struck against stationary object

EE WAS ANFOING A ROOM, WAS SWITCHING SIDES TO ANFO THE OTHER. IN THE PROCESS EE WAS WALKING BACKWARDS PULLING HOS, TRIPPED OVER A ROCK THAT HAD BEEN SCALED DOWN.

November 8, 2004 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Hunt Midwest Mining Inc · Struck by... (Not Elsewhere Classified)

HE WAS CUTTING OFF ANGLE IRON WITH A CUT OFF SAW WHEN SPARKS BOUNCED OFF GUARD COMING UNDER SAFETY GLASSES HITTING RIGHT EYE.

July 24, 2004 MO · Metal/Non-Metal ledgeman/hand, quarry man HANDLING OF MATERIALS
Hunt Midwest Mining Inc · Struck by falling object

MINER WAS INSTALLING 8' X 20' METAL SCREENS VERTICALLY ON 20' RIB. SCREEN PULLED LOOSE AND FELL APPROX 2' STRIKING HIM ON THE HAND.

June 13, 2004 MO · Metal/Non-Metal FALL OF ROOF OR BACK
Hunt Midwest Mining Inc · Accident type, without injuries

SHOTCRETE FELL ONTO THE INTERSECTION OF CONVEYORS S-2 & S-3, A PIECE FELL APPROX. 15' X 30'X 6' THICK. DAMAGE WAS EXTENSIVE TO HEADSECTION OF S-2. THIS FALL TOOK PLACE OUTSIDE OF NORMAL WORKHOURS, NO ONE WAS IN THE MINE AT THE TIME. THE FALL WAS DISCOVERED ON MONDAY MORNING. NO ONE WAS ALLOWED TO ENTER UNTIL THE AREA WAS SECURE.

June 5, 2004 MO · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL
Hunt Midwest Mining Inc · Struck by falling object

EE WAS LOADING A ROOM THAT HAD BEEN MECHANICALLY SEALED AS WELL AS HAND SEALED. A ROCK THE SIZE OF A BASKETBALL CAME LOOSE FROM THE FACE AS HE WAS LOADING AND STRUCK HIS HAND. IT LEFT A RED MARK BUT HE DID NOT REPORT IT. THE FOLLOWING DAY THE HAND WAS SORE AND SWOLLEN. HE CALLED IN ON THE MORNING OF 06/07/04 AND WAS TOLD TO GO TO CLINIC.

May 12, 2004 MO · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator POWERED HAULAGE
Hunt Midwest Mining Inc · Struck against a moving object

EE WAS OPERATING SKID STEER, CLEANING SPILLAGE FROM IN FRONT OF THE DUMP HOPPER. A EUCLID R-40 ARRIVED AT THE DUMP HOPPER TO DUMP. THE EUCLID R-40 DRIVER PULLED FORWARD AND STARTED TO BACK UP TO THE HOPPER. HE DID NOT SEE THE SKID STEER AND BACKED INTO IT, THROWING EE FORWARD AGAINST THE SAFETY BAR. DAMAGE TO SKID STEER WAS MINIMAL.

April 9, 2004 MO · Metal/Non-Metal FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL
Hunt Midwest Mining Inc · Accident type, without injuries

Strot crete at intersection conveyors s-2 and s-3 a centurm about 15'x15' fell an road service 3 men in mine at time of fall. used man pod to leave mine only men working on repair a laid in slope.

January 15, 2004 MO · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver

EMPLOYEE FAILED TO FOLLOW DUMP PROCEDURES PRIOR TO RE-ENTRY OF MINE CAUSING RAISED BE TO STRIKE MINE PORTAL.

2003 · 2 incidents

July 21, 2003 MO · Metal/Non-Metal miner, nec POWERED HAULAGE
Hunt Midwest Mining Inc · Struck against a moving object

EMPLOYEE WAS MUCKING OUT A ROOM. WHILE TRAVELING FORWARD THE EQUIPMENT STRUCK A LOW SPOT IN THE ROOF WITH THE CAB OF THE LOADER. THIS ACTION STOPPED THE LOADER CAUSING HIS HEAD AND NECK TO MOV E FORWARD. EMPLOYEE EXPERIENCED SORENESS IN THE NECK.

April 25, 2003 MO · Metal/Non-Metal FALL OF ROOF OR BACK
Hunt Midwest Mining Inc · Accident type, without injuries

A ROOF FALL OCCURRED AT INTERSECTION 1 NORTH / 1 WEST. A SECOND FALL OCCURRED 4/27/03 AT INTERSECTION 0 2 NORTH. THE EXACT CAUSE OF ROOF FALL IS UNKNOWN. TECHNICAL EXPERTISE FROM PRIVATE AS WE LL AS MSHA WILL YIELD MORE INFORMATION. BOTH FALLS OCCURRED ABOVE THE ANCHOR ZONE.

For insurers, brokers, and safety consultants

The full compliance file on Stamper Underground

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.