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IROCK Portable #1: 32 MSHA citations Metal/Non-Metal

Controlled by Mark Magruder
Milan, Shelby County, MO  ·  Active
MSHA Mine ID: 2302495

IROCK Portable #1 has $7K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
3
Years on record
2017–2024
Latest incident
Dec 2024
Compliance record
MSHA citations since 2015
32
citations
7
significant & substantial
$7,491
proposed penalties
$7,273
paid to date
97% of proposed penalties paid to date, a $218 gap.
Source: MSHA violations data, updated weekly.
See Magruder Limestone Co's full MSHA compliance history →
Inspection activity
MSHA inspections since 2015
31
inspections on record
307
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: 307 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 Portable #1 has $7K 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.
$7K
proposed penalties
$7K
current assessed
$7K
paid to date
$0
outstanding
30 assessments are final orders; 1 contested dockets.
Of $690 in penalties contested before the Commission, $354 was upheld in final decisions.
As of the most recent assessment on 2025-09-17.
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.
23.3%
significant & substantial
13.3%
high negligence or reckless
23.3%
reasonably likely or greater
50.0%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 13.3% low, 73.3% moderate, 13.3% 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.
4 citations taken to the federal commission · 13% of citations on record
  • Settled 3 · 75%
  • Vacated or withdrawn 1 · 25%
49%
Penalty reduction in decided contests
$690 proposed, $354 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.
Docket Decision Judge Year Proposed / upheld
CENT 2018-0447 Settlement Moran 2019 $690 → $354
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: 2023-08-01, 3 years ago
0%
of limit-tested samples over the exposure limit
11
samples
5
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg5
  • Nuisance dust, respirable, <1% Qtz4
  • Quartz, respirable, >1% Qtz2
Show the individual readings (11)
Date Contaminant Concentration Limit Conc / limit Occupation
2023-08-01 Nuisance dust, respirable, <1% Qtz 0.24 10 0.02 Front-end Loader Operator
2023-08-01 Nuisance dust, respirable, <1% Qtz 0.29 10 0.03 Truck Driver
2023-08-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-08-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2021-10-06 Respirable dust, <.1mg 0 Truck Driver
2021-10-06 Quartz, respirable, >1% Qtz 0.29 0.75 0.39 Front-end Loader Operator
2021-10-06 Nuisance dust, respirable, <1% Qtz 0.16 10 0.02 Front-end Loader Operator
2021-10-06 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-06-04 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-06-04 Quartz, respirable, >1% Qtz 0.2 Front-end Loader Operator
2019-06-04 Nuisance dust, respirable, <1% Qtz 0.26 10 0.03 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.
Ownership history
  1. Magruder Limestone Co 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 5
2025 4
2024 5
2023 4
2022 5
2021 5
2020 6
2019 4
2018 5
2017 5
2016 4
Source: MSHA quarterly employment and production, updated weekly.

IROCK Portable #1 sits in Shelby 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.
Shelby County, Missouri · Population 6,011
0.3%
Mining share of county employment
$52,127
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 3,050 0 0 0.0
2026 Q1 2,575 0 0 0.0
2025 Q4 2,714 0 0 0.0
2025 Q3 2,830 1 0 353.4
2025 Q2 2,762 0 0 0.0
2025 Q1 1,954 1 0 511.8
2024 Q4 2,746 0 0 0.0
2024 Q3 2,667 0 0 0.0
Show 34 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 2,531 0 0 0.0
2024 Q1 2,346 1 0 426.3
2023 Q4 2,465 0 0 0.0
2023 Q3 2,589 2 0 772.5
2023 Q2 2,375 0 0 0.0
2023 Q1 2,547 0 0 0.0
2022 Q4 2,185 0 0 0.0
2022 Q3 2,770 0 0 0.0
2022 Q2 2,883 0 0 0.0
2022 Q1 3,207 0 0 0.0
2021 Q4 2,423 1 0 412.7
2021 Q3 2,647 0 0 0.0
2021 Q2 4,391 0 0 0.0
2021 Q1 3,339 0 0 0.0
2020 Q4 3,423 1 0 292.1
2020 Q3 3,657 0 0 0.0
2020 Q2 3,347 0 0 0.0
2020 Q1 2,927 1 0 341.6
2019 Q4 2,379 0 0 0.0
2019 Q3 2,471 0 0 0.0
2019 Q2 2,843 2 0 703.5
2019 Q1 2,640 2 0 757.6
2018 Q4 3,297 0 0 0.0
2018 Q3 2,952 0 0 0.0
2018 Q2 3,350 4 0 1194.0
2018 Q1 1,754 0 0 0.0
2017 Q4 2,423 3 3 1238.1
2017 Q3 3,507 0 0 0.0
2017 Q2 2,558 2 1 781.9
2017 Q1 1,634 1 0 612.0
2016 Q4 2,289 1 0 436.9
2016 Q3 1,323 0 0 0.0
2016 Q2 1,174 0 0 0.0
2016 Q1 1,169 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

3 on file

2024 · 1 incident

December 5, 2024 MO · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Magruder Limestone Co · Over-exertion in pulling or pushing objects

Pushing & pulling barrel / drum of antifreeze and strained shoulder (R).

2023 · 1 incident

March 13, 2023 MO · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Magruder Limestone Co · Fall from machine

Slip/trip/fall from height. While on a conveyor belt cleaning an accumulation of rock the EE fell from the belt to the ground striking head and shoulder and arm.

2017 · 1 incident

October 6, 2017 MO · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
Magruder Limestone Co · Struck against a moving object

EE reports that EE's knee is sore and swollen from operating a Cat 980H front end loader while loading trucks and stockpiling.