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: 372 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
IROCK PORT #2 has $6K in proposed MSHA penalties and $0 outstanding across 1 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.
$6K
proposed penalties
$5K
current assessed
$5K
paid to date
$0
outstanding
34 assessments are final orders; 1 contested dockets.
Of $1K in penalties contested before the Commission, $825 was upheld in final decisions.
As of the most recent assessment on 2025-04-23.
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.
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.
4citations taken to the federal commission · 12% of citations on record
Settled
2 · 50%
Vacated or withdrawn
2 · 50%
100%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 1 decided S&S contests · industry: 79%
40%
Penalty reduction in decided contests
$1K proposed, $825 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2018-09-05.
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.
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: 2025-04-23
0%
of limit-tested samples over the exposure limit
14
samples
2
limit-tested
Most sampled contaminants
Respirable dust, <.1mg7
Quartz, respirable, >1% Qtz6
Nuisance dust, respirable, <1% Qtz1
Show the individual readings (14)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-04-23
Quartz, respirable, >1% Qtz
1.27
2.56
0.50
Front-end Loader Operator
2025-04-23
Quartz, respirable, >1% Qtz
0.23
Front-end Loader Operator
2025-04-23
Quartz, respirable, >1% Qtz
0.13
Front-end Loader Operator
2025-04-23
Respirable dust, <.1mg
0
Truck Driver
2023-12-20
Respirable dust, <.1mg
0
Crusher Oper/Worker
2023-12-20
Respirable dust, <.1mg
0
Front-end Loader Operator
2023-12-20
Quartz, respirable, >1% Qtz
0.2
Front-end Loader Operator
2021-07-13
Quartz, respirable, >1% Qtz
0.2
Front-end Loader Operator
2021-07-13
Quartz, respirable, >1% Qtz
0.31
Truck Driver
2021-07-13
Nuisance dust, respirable, <1% Qtz
0.32
10
0.03
Front-end Loader Operator
2016-07-12
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-07-12
Respirable dust, <.1mg
0
Supervisor, Co. Official
2016-07-12
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-07-12
Respirable dust, <.1mg
0
Front-end Loader 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.
IROCK PORT #2 recorded 9.96 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.
9.96
total case rate
0.00
days-away rate
0.000
fatality rate
Above 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.
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
7
2025
7
2024
6
2023
6
2022
6
2021
5
2020
5
2019
5
2018
6
2017
8
2016
4
2015
3
2014
2
Source: MSHA quarterly employment and production, updated weekly.
IROCK PORT #2 sits in Lincoln County, Missouri, where the Census mining category is 0.4% 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.
Lincoln County, Missouri · Population 61,636
0.4%
Mining share of county employment
$85,276
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
4,464
0
0
0.0
2026 Q1
3,278
0
0
0.0
2025 Q4
3,628
0
0
0.0
2025 Q3
6,413
0
0
0.0
2025 Q2
6,389
2
0
313.0
2025 Q1
3,641
1
0
274.6
2024 Q4
3,705
0
0
0.0
2024 Q3
3,891
0
0
0.0
Show 39 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
4,186
1
0
238.9
2024 Q1
3,194
0
0
0.0
2023 Q4
3,957
2
0
505.4
2023 Q3
4,027
0
0
0.0
2023 Q2
3,654
1
0
273.7
2023 Q1
3,519
3
0
852.5
2022 Q4
3,535
0
0
0.0
2022 Q3
3,823
1
0
261.6
2022 Q2
3,382
0
0
0.0
2022 Q1
3,572
3
0
839.9
2021 Q4
3,005
0
0
0.0
2021 Q3
3,177
0
0
0.0
2021 Q2
3,848
0
0
0.0
2021 Q1
3,016
0
0
0.0
2020 Q4
3,125
1
0
320.0
2020 Q3
3,663
2
0
546.0
2020 Q2
3,758
0
0
0.0
2020 Q1
2,248
0
0
0.0
2019 Q4
2,817
3
1
1065.0
2019 Q3
2,995
1
0
333.9
2019 Q2
3,890
0
0
0.0
2019 Q1
3,350
2
0
597.0
2018 Q4
3,441
0
0
0.0
2018 Q3
3,310
0
0
0.0
2018 Q2
3,563
3
1
842.0
2018 Q1
2,750
2
0
727.3
2017 Q4
4,150
0
0
0.0
2017 Q3
3,076
0
0
0.0
2017 Q2
4,371
1
0
228.8
2017 Q1
5,333
0
0
0.0
2016 Q4
1,455
1
0
687.3
2016 Q3
1,323
3
0
2267.6
2016 Q2
1,174
0
0
0.0
2016 Q1
1,170
1
0
854.7
2015 Q4
861
0
0
0.0
2015 Q3
648
0
0
0.0
2015 Q2
2,958
0
0
0.0
2015 Q1
456
0
0
0.0
2014 Q4
604
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
10 on file
2025 · 1 incident
February 3, 2025MO · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanDISORDERS (REPEATED TRAUMA)
Loading a water hose into a loader bucket the injured employee reported their foot got stuck in the mud. EE could not move and the bucket came down on EE's foot (R).
2022 · 2 incidents
September 12, 2022MO · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
Employee was getting out of the truck on a stripping shot and stepped down from the truck. Where a dip in the ground was that EE didn`t notice and rolled EE's left ankle. When EE fell down EE heard and felt a pop in EE's ankle as EE was falling down EE also jammed EE's left pinky when EE tried to catch self.
2021 · 1 incident
October 14, 2021MO · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorHANDLING OF MATERIALS
IE was removing a tension bolt on a screen to change screen. Utilizing an impact wrench to remove the bolt ee was guiding the washer/bolt with left hand. EE activated the impact wrench and ee fingers were caught/pinched/grabbed and caused ee to lose skin/tissue on palm side of middle finger.
EE injured left index finger when it was struck by a hammer. EE was holding a punch tool and another ee swing the hammer, missed the tool and struck the injured ee hand.
Related mines
Other mines operated by Magruder Limestone Company, Inc.