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Plant #81: 102 MSHA citations Metal/Non-Metal

Mercer, Nodaway County, MO  ·  Active
MSHA Mine ID: 2302296

Plant #81 has $22K in proposed MSHA penalties and $604 outstanding across 5 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
5
Years on record
2009–2023
Latest incident
Apr 2023
Compliance record
MSHA citations since 2006
102
citations
17
significant & substantial
$21,548
proposed penalties
$17,980
paid to date
83% of proposed penalties paid to date, a $3,568 gap.
Source: MSHA violations data, updated weekly.
See Martin Marietta Materials, Inc.'s full MSHA compliance history →
Inspection activity
MSHA inspections since 2006
51
inspections on record
895
inspection hours
n/a
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.
Rate withheld: 895 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Plant #81 has $22K in proposed MSHA penalties and $604 outstanding across 5 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.
$22K
proposed penalties
$19K
current assessed
$18K
paid to date
$604
outstanding
99 assessments are final orders; 5 contested dockets.
Of $4K in penalties contested before the Commission, $765 was upheld in final decisions.
As of the most recent assessment on 2026-02-25.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘ Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
16.7%
significant & substantial
2.9%
high negligence or reckless
16.7%
reasonably likely or greater
58.8%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 29.4% low, 67.6% moderate, 2.9% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘ Contesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.
8 citations taken to the federal commission · 8% of citations on record
  • Settled 7 · 88%
  • Vacated or withdrawn 1 · 13%
33%
S&S designation survived the contest
ⓘ Counts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.
of 3 decided S&S contests · industry: 79%
71%
Penalty reduction in decided contests
$6K proposed, $2K after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2022-08-23.
Contested penalties
ⓘ A reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Docket Decision Judge Year Proposed / upheld
CENT 2022-0203 Settlement Simonton 2022 $3K → $414
CENT 2011-1159M Settlement Lesnick 2012 $190 → $100
CENT 2022-0220 Settlement Miller 2022 $133 → $133
CENT 2018-0410 Settlement Lesnick 2018 $118 → $118
CENT 2012-825M Withdrawal Lesnick 2013 $100 → $0
Source: FMSHRC civil penalty dockets and decisions (public record), updated weekly.
Health sampling
ⓘ A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.

Metal and nonmetal contaminants (personal samples)
ⓘ Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.

Last sampled: 2026-02-25
16%
of limit-tested samples over the exposure limit
56
samples
25
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz254 over
  • Respirable dust, <.1mg21
  • Nuisance dust, respirable, <1% Qtz10
Show the individual readings (56)
Date Contaminant Concentration Limit Conc / limit Occupation
2018-06-14 Quartz, respirable, >1% Qtz 1.24 0.89 1.39 Truck Driver
2008-03-12 Quartz, respirable, >1% Qtz 29.53 2.55 11.58 Truck Driver
2006-05-10 Quartz, respirable, >1% Qtz 2.65 0.71 3.73 Truck Driver
2006-05-10 Quartz, respirable, >1% Qtz 1.18 0.59 2.00 Truck Driver
2026-02-25 Quartz, respirable, >1% Qtz 0.62 2.5 0.25 Cleanup Man
2026-02-25 Quartz, respirable, >1% Qtz 0.32 Crusher Oper/Worker
2026-02-25 Respirable dust, <.1mg 0 Front-end Loader Operator
2026-02-25 Respirable dust, <.1mg 0 Truck Driver
2025-06-25 Respirable dust, <.1mg 0 Front-end Loader Operator
2025-06-25 Nuisance dust, respirable, <1% Qtz 1.06 10 0.11 Crusher Oper/Worker
2025-06-25 Respirable dust, <.1mg 0 Truck Driver
2025-06-25 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-11-15 Respirable dust, <.1mg 0 Laborer, Bullgang
2023-11-15 Quartz, respirable, >1% Qtz 0.22 Crusher Oper/Worker
2023-11-15 Respirable dust, <.1mg 0 Truck Driver
2023-11-15 Quartz, respirable, >1% Qtz 0.23 Truck Driver
2022-11-08 Nuisance dust, respirable, <1% Qtz 0.16 10 0.02 Front-end Loader Operator
2022-11-08 Quartz, respirable, >1% Qtz 0.16 Crusher Oper/Worker
2022-11-08 Respirable dust, <.1mg 0 Truck Driver
2022-11-08 Quartz, respirable, >1% Qtz 0.15 Truck Driver
2022-05-10 Respirable dust, <.1mg 0 Truck Driver
2022-05-10 Respirable dust, <.1mg 0 Truck Driver
2022-05-10 Respirable dust, <.1mg 0 Truck Driver
2022-05-10 Respirable dust, <.1mg 0 Truck Driver
2022-04-26 Respirable dust, <.1mg 0 Truck Driver
2022-04-26 Quartz, respirable, >1% Qtz 0.14 Truck Driver
2022-04-26 Quartz, respirable, >1% Qtz 0.22 Front-end Loader Operator
2022-04-26 Quartz, respirable, >1% Qtz 0.39 0.86 0.45 Cleanup Man
2022-04-26 Quartz, respirable, >1% Qtz 0.26 0.67 0.39 Crusher Oper/Worker
2021-05-13 Quartz, respirable, >1% Qtz 0.46 Truck Driver
2021-05-13 Nuisance dust, respirable, <1% Qtz 2.08 10 0.21 Crusher Oper/Worker
2021-05-13 Nuisance dust, respirable, <1% Qtz 4.07 10 0.41 Truck Driver
2020-09-15 Nuisance dust, respirable, <1% Qtz 0.27 10 0.03 Truck Driver
2020-09-15 Respirable dust, <.1mg 0 Cleanup Man
2020-09-15 Quartz, respirable, >1% Qtz 0.39 Crusher Oper/Worker
2018-07-24 Quartz, respirable, >1% Qtz 0.28 0.77 0.36 Truck Driver
2018-06-14 Quartz, respirable, >1% Qtz 0.37 1.11 0.33 Truck Driver
2018-06-14 Quartz, respirable, >1% Qtz 0.16 Cleanup Man
2018-06-14 Nuisance dust, respirable, <1% Qtz 0.26 10 0.03 Truck Driver
2013-04-17 Nuisance dust, respirable, <1% Qtz 0.22 10 0.02 Truck Driver
2013-04-17 Respirable dust, <.1mg 0 Bobcat Operator
2013-04-17 Respirable dust, <.1mg 0 Front-end Loader Operator
2013-04-17 Respirable dust, <.1mg 0 Truck Driver
2011-10-12 Quartz, respirable, >1% Qtz 0.31 2.29 0.14 Front-end Loader Operator
2011-10-12 Respirable dust, <.1mg 0 Truck Driver
2011-10-12 Nuisance dust, respirable, <1% Qtz 0.4 10 0.04 Crusher Oper/Worker
2011-10-12 Quartz, respirable, >1% Qtz 0.33 2.02 0.16 Truck Driver
2011-10-12 Nuisance dust, respirable, <1% Qtz 0.22 10 0.02 Laborer, Bullgang
2009-09-02 Respirable dust, <.1mg 0 Front-end Loader Operator
2009-09-02 Quartz, respirable, >1% Qtz 0.82 3.13 0.26 Crusher Oper/Worker
2009-09-02 Nuisance dust, respirable, <1% Qtz 0.2 10 0.02 Front-end Loader Operator
2009-09-02 Quartz, respirable, >1% Qtz 0.46 1.74 0.26 Truck Driver
2009-09-02 Respirable dust, <.1mg 0 Truck Driver
2008-03-12 Quartz, respirable, >1% Qtz 0.26 1.5 0.17 Laborer, Bullgang
2008-03-12 Quartz, respirable, >1% Qtz 0.54 1.02 0.53 Truck Driver
2006-05-10 Respirable dust, <.1mg 0 Backhoe Operator
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.

Plant #81 recorded 0.00 reportable injury cases per 100 full-time workers in 2025.

Injury rate, 2025
ⓘ This rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Missouri, metal and nonmetal mining averaged 2.13 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year total case rate days-away fatal
2025 * 0.00 0.00 0.000
2024 * 0.00 0.00 0.000
2023 * 5.53 0.00 0.000
2022 * 0.00 0.00 0.000
2021 * 0.00 0.00 0.000
2020 * 4.24 0.00 0.000
2019 * 0.00 0.00 0.000
2018 * 0.00 0.00 0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Ownership history
  1. Norris Asphalt Paving Company 2004 to 2012
  2. Norris Quarries, LLC 2012 to 2016
  3. Con-Agg Companies, LLC 2016 to 2026
  4. Martin Marietta Materials, Inc. 2026 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 11
2025 14
2024 14
2023 15
2022 16
2021 17
2020 19
2019 21
2018 15
2017 18
2016 17
2015 20
2014 20
2013 15
2012 16
2011 20
2010 17
2009 17
2008 19
2007 12
2006 8
2005 5
2004 5
Source: MSHA quarterly employment and production, updated weekly.

Plant #81 sits in Nodaway County, Missouri, where the Census mining category is 0.3% of county employment.

Local economic context
ⓘ County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Nodaway County, Missouri · Population 20,959
0.3%
Mining share of county employment
$55,970
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
2026 Q2 6,888 0 0 0.0
2026 Q1 594 4 0 6734.0
2025 Q4 8,444 0 0 0.0
2025 Q3 10,861 0 0 0.0
2025 Q2 11,299 3 1 265.5
2025 Q1 8,837 2 0 226.3
2024 Q4 8,447 0 0 0.0
2024 Q3 8,121 1 0 123.1
Show 76 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 9,400 0 0 0.0
2024 Q1 9,646 0 0 0.0
2023 Q4 8,690 2 0 230.1
2023 Q3 8,178 0 0 0.0
2023 Q2 10,519 2 0 190.1
2023 Q1 8,765 0 0 0.0
2022 Q4 9,906 5 0 504.7
2022 Q3 9,836 0 0 0.0
2022 Q2 11,963 1 0 83.6
2022 Q1 7,057 0 0 0.0
2021 Q4 10,179 3 0 294.7
2021 Q3 9,545 0 0 0.0
2021 Q2 11,576 1 0 86.4
2021 Q1 8,645 1 0 115.7
2020 Q4 10,249 0 0 0.0
2020 Q3 10,469 3 0 286.6
2020 Q2 14,214 0 0 0.0
2020 Q1 12,291 0 0 0.0
2019 Q4 17,535 2 0 114.1
2019 Q3 13,578 2 0 147.3
2019 Q2 12,243 0 0 0.0
2019 Q1 6,735 0 0 0.0
2018 Q4 6,706 0 0 0.0
2018 Q3 7,103 0 0 0.0
2018 Q2 8,826 5 2 566.5
2018 Q1 9,563 0 0 0.0
2017 Q4 8,524 0 0 0.0
2017 Q3 11,980 0 0 0.0
2017 Q2 8,541 0 0 0.0
2017 Q1 10,178 1 0 98.3
2016 Q4 10,822 0 0 0.0
2016 Q3 10,007 0 0 0.0
2016 Q2 8,789 0 0 0.0
2016 Q1 8,985 0 0 0.0
2015 Q4 8,945 5 0 559.0
2015 Q3 10,132 0 0 0.0
2015 Q2 11,973 0 0 0.0
2015 Q1 9,900 2 1 202.0
2014 Q4 12,903 0 0 0.0
2014 Q3 13,193 0 0 0.0
2014 Q2 9,409 0 0 0.0
2014 Q1 8,003 2 1 249.9
2013 Q4 8,910 0 0 0.0
2013 Q3 8,131 0 0 0.0
2013 Q2 11,626 0 0 0.0
2013 Q1 3,948 0 0 0.0
2012 Q4 8,758 1 0 114.2
2012 Q3 8,944 0 0 0.0
2012 Q2 9,887 2 1 202.3
2012 Q1 3,722 0 0 0.0
2011 Q4 11,487 7 3 609.4
2011 Q3 25,226 0 0 0.0
2011 Q2 11,328 3 0 264.8
2011 Q1 7,950 2 0 251.6
2010 Q4 9,432 0 0 0.0
2010 Q3 12,051 0 0 0.0
2010 Q2 13,604 1 0 73.5
2010 Q1 8,540 0 0 0.0
2009 Q4 10,327 3 0 290.5
2009 Q3 10,258 4 0 389.9
2009 Q2 11,174 5 2 447.5
2009 Q1 10,443 0 0 0.0
2008 Q4 8,925 0 0 0.0
2008 Q3 16,215 0 0 0.0
2008 Q2 15,786 1 1 63.3
2008 Q1 10,115 1 0 98.9
2007 Q4 9,187 0 0 0.0
2007 Q3 4,738 0 0 0.0
2007 Q2 5,990 1 0 166.9
2007 Q1 5,063 0 0 0.0
2006 Q4 5,708 0 0 0.0
2006 Q3 7,624 0 0 0.0
2006 Q2 3,825 2 2 522.9
2006 Q1 3,907 0 0 0.0
2005 Q4 1,825 0 0 0.0
2004 Q3 3,459 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

5 on file

2023 · 1 incident

April 14, 2023 MO · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Con-Agg Companies, LLC · Fall to the walkway or working surface

Employee was standing inside the crusher shack on the threshold at the door with right foot halfway out of the the shack. There is approx. a 4 inch drop to the catwalk from the threshold. EE's right foot slipped down to the catwalk and caused EE to fall to the catwalk. This action caused EE to fracture the small toe on right foot.

2020 · 1 incident

May 13, 2020 MO · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Con-Agg Companies, LLC · Fall from machine

Employee was in the process of dismounting a front end loader and shutting the cab door. EE lost footing and fell off the ladder to the ground. Employee was released to work the next day with work restrictions.

2016 · 1 incident

February 26, 2016 MO · Metal/Non-Metal groundman, yardman HANDTOOLS (NONPOWERED)
Norris Quarries, LLC · Struck by... (Not Elsewhere Classified)

Employee was cutting a hole in a piece of conveyor belting using a utility knife. The knife slipped out of the hole EE was cutting and lacerated EE's left hand. EE received stitches to close the wound. EE was released for full duty the same date of injury with minor lifting restrictions which did not prohibit EE from working full duty.

2012 · 1 incident

July 24, 2012 MO · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Norris Quarries, LLC · Over-exertion (Not Elsewhere Classified)

Employee was rebuilding a water pump and applied a lot of pressure to remove the impeller. His left wrist was strained in the process and he was in pain. When he was seen by the physician, the injury showed possible signs of Carpel Tunnel Syndrome. He was issued a wrist splint to wear for two weeks and was placed with limited/restricted use of his left hand.

2009 · 1 incident

May 15, 2009 MO · Metal/Non-Metal outside foreman, leadman HANDLING OF MATERIALS
Norris Asphalt Paving Company · Over-exertion in lifting objects

Employee was moving a rolled up conveyor belt with a chain and a front end loader. During transport, the belt needed to be repositioned. While manually handling the belt the employee sustained a ruptured bicep tendon. The injury required surgery which was repaired on 5/20/09.