Ideker Mining LLC · Accident type, without injuries
A layer in the primary hall road fell at the intersection of 0-F. No miners or equipment were injured.
Mosby Quarry: 129 MSHA citations Metal/Non-Metal
Mosby Quarry has $31K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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- Fatalities
- 0
- Total incidents
- 3
- Years on record
- 2022–2026
- Latest incident
- Aug 2026
Compliance record
MSHA citations since 2014
129
citations
21
significant & substantial
$31,348
proposed penalties
$31,348
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2014
65
inspections on record
1,206
inspection hours
10.7
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.129 citations across 1,206 inspection hours.
Source: MSHA inspections data, updated weekly.
Mosby Quarry has $31K in proposed MSHA penalties and $0 outstanding across 0 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.$31K
proposed penalties
$31K
current assessed
$31K
paid to date
$0
outstanding
115 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-06-03.
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.16.5%
significant & substantial
15.0%
high negligence or reckless
16.5%
reasonably likely or greater
61.4%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 15.7% low, 69.3% moderate, 15.0% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, 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: 2026-08-18
ⓘ
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.6%
of limit-tested samples over the exposure limit
35
samples
16
limit-tested
Most sampled contaminants
- Quartz, respirable, >1% Qtz121 over
- Respirable dust, <.1mg14
- Diesel particulate (total carbon)8
- Nuisance dust, respirable, <1% Qtz1
Show the individual readings (59)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2024-05-08 | Quartz, respirable, >1% Qtz | 2.04 | 1.7 | 1.20 | Drill Operator, Jumbo Perc. |
| 2026-08-18 | ORGANIC CARBON | 87 | Scaling (mechanical) | ||
| 2026-08-18 | TC @ 160 | 144 | 160 | 0.90 | Scaling (mechanical) |
| 2026-08-18 | EC @ 160 | 57 | 160 | 0.36 | Scaling (mechanical) |
| 2026-08-18 | TC from EC @ 160 | 0 | 160 | 0.00 | Scaling (mechanical) |
| 2026-08-18 | ORGANIC CARBON | 0 | Front-end Loader Operator | ||
| 2026-08-18 | TC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2026-08-18 | EC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2026-08-18 | TC from EC @ 160 | 0 | 160 | 0.00 | Front-end Loader Operator |
| 2026-08-18 | ORGANIC CARBON | 0 | Drill Operator, Rotary | ||
| 2026-08-18 | TC @ 160 | 0 | 160 | 0.00 | Drill Operator, Rotary |
| 2026-08-18 | EC @ 160 | 0 | 160 | 0.00 | Drill Operator, Rotary |
| 2026-08-18 | TC from EC @ 160 | 0 | 160 | 0.00 | Drill Operator, Rotary |
| 2026-08-18 | ORGANIC CARBON | 0 | Blaster, Powder Gang | ||
| 2026-08-18 | TC @ 160 | 70 | 160 | 0.44 | Blaster, Powder Gang |
| 2026-08-18 | EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2026-08-18 | TC from EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | EC @ 160 | 0 | 160 | 0.00 | Drill Operator, Jumbo Perc. |
| 2025-01-15 | TC from EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | TC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | ORGANIC CARBON | 0 | Blaster, Powder Gang | ||
| 2025-01-15 | TC from EC @ 160 | 0 | 160 | 0.00 | Scaling (mechanical) |
| 2025-01-15 | EC @ 160 | 0 | 160 | 0.00 | Scaling (mechanical) |
| 2025-01-15 | TC @ 160 | 0 | 160 | 0.00 | Scaling (mechanical) |
| 2025-01-15 | ORGANIC CARBON | 0 | Scaling (mechanical) | ||
| 2025-01-15 | TC from EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | EC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | TC @ 160 | 0 | 160 | 0.00 | Blaster, Powder Gang |
| 2025-01-15 | ORGANIC CARBON | 0 | Blaster, Powder Gang | ||
| 2025-01-15 | TC from EC @ 160 | 0 | 160 | 0.00 | Drill Operator, Jumbo Perc. |
| 2025-01-15 | TC @ 160 | 0 | 160 | 0.00 | Drill Operator, Jumbo Perc. |
| 2025-01-15 | ORGANIC CARBON | 0 | Drill Operator, Jumbo Perc. | ||
| 2025-01-15 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2025-01-15 | Quartz, respirable, >1% Qtz | 0.15 | Cleanup Man | ||
| 2025-01-15 | Respirable dust, <.1mg | 0 | Crusher Oper/Worker | ||
| 2025-01-15 | Quartz, respirable, >1% Qtz | 0.23 | Truck Driver | ||
| 2024-10-16 | Quartz, respirable, >1% Qtz | 0.57 | 1.64 | 0.35 | Blaster, Powder Gang |
| 2024-10-16 | Quartz, respirable, >1% Qtz | 0.21 | Drill Operator, Rotary | ||
| 2024-10-16 | Quartz, respirable, >1% Qtz | 0.27 | Drill Operator, Rotary | ||
| 2024-05-08 | Quartz, respirable, >1% Qtz | 1.17 | 2.33 | 0.50 | Scaling (mechanical) |
| 2024-05-08 | Quartz, respirable, >1% Qtz | 0.36 | Roof Bolter, Rock | ||
| 2023-05-10 | Respirable dust, <.1mg | 0 | Backhoe Operator | ||
| 2023-05-10 | Quartz, respirable, >1% Qtz | 0.37 | 0.94 | 0.39 | Truck Driver |
| 2023-05-10 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2023-05-10 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2020-04-22 | Respirable dust, <.1mg | 0 | Crusher Oper/Worker | ||
| 2020-04-22 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2020-04-22 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2020-04-22 | Respirable dust, <.1mg | 0 | Cleanup Man | ||
| 2016-09-22 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2016-09-22 | Nuisance dust, respirable, <1% Qtz | 0.12 | 10 | 0.01 | Truck Driver |
| 2016-09-22 | Respirable dust, <.1mg | 0 | Crusher Oper/Worker | ||
| 2016-09-22 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2016-09-22 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2015-09-02 | Quartz, respirable, >1% Qtz | 0.22 | 1.08 | 0.20 | Crusher Oper/Worker |
| 2015-09-02 | Quartz, respirable, >1% Qtz | 0.43 | 1 | 0.43 | Truck Driver |
| 2015-09-02 | Quartz, respirable, >1% Qtz | 0.31 | 0.97 | 0.32 | Laborer, Bullgang |
| 2015-09-02 | Respirable dust, <.1mg | 0 | Front-end Loader Operator |
Area samples (mill and shop air)
Last sampled: 2026-08-182
samples
Show the individual readings (4)
| Date | Contaminant | Concentration | Limit | Conc / limit | Area sampled |
|---|---|---|---|---|---|
| 2026-08-18 | EC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2026-08-18 | TC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2025-01-15 | EC @ 160 | 0 | UG TRAVEL/HAULAGE | ||
| 2025-01-15 | TC @ 160 | 0 | UG TRAVEL/HAULAGE |
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.
Mosby Quarry 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 and are withheld below 20,000 hours in a year. Employment reports reach back to 1983, but those earlier years come from MSHA's archived file format and are not used in rates.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 * | 0.00 | 0.00 | 0.000 |
| 2022 * | 6.60 | 0.00 | 0.000 |
| 2021 * | 0.00 | 0.00 | 0.000 |
| 2020 * | 0.00 | 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
- Ideker Inc 2013 to 2024
- Ideker Mining LLC 2025 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
| Year | Employees |
|---|---|
| 2026 | 21 |
| 2025 | 19 |
| 2024 | 14 |
| 2023 | 15 |
| 2022 | 14 |
| 2021 | 12 |
| 2020 | 13 |
| 2019 | 13 |
| 2018 | 12 |
| 2017 | 11 |
| 2016 | 11 |
| 2015 | 12 |
| 2014 | 9 |
| 2013 | 5 |
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Mosby Quarry sits in Clay County, Missouri, where the Census mining category is 0.2% 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.Clay County, Missouri · Population 255,566
0.2%
Mining share of county employment
$86,150
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; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. 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 | 10,885 | 6 | 2 | 551.2 |
| 2026 Q1 | 9,037 | 8 | 3 | 885.2 |
| 2025 Q4 | 9,718 | 2 | 0 | 205.8 |
| 2025 Q3 | 13,057 | 3 | 0 | 229.8 |
| 2025 Q2 | 10,548 | 4 | 0 | 379.2 |
| 2025 Q1 | 6,905 | 7 | 2 | 1013.8 |
| 2024 Q4 | 9,211 | 17 | 2 | 1845.6 |
| 2024 Q3 | 6,258 | 1 | 0 | 159.8 |
Show 46 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 7,800 | 9 | 0 | 1153.8 |
| 2024 Q1 | 7,943 | 4 | 1 | 503.6 |
| 2023 Q4 | 6,713 | 3 | 0 | 446.9 |
| 2023 Q3 | 5,986 | 0 | 0 | 0.0 |
| 2023 Q2 | 6,142 | 5 | 1 | 814.1 |
| 2023 Q1 | 7,385 | 9 | 2 | 1218.7 |
| 2022 Q4 | 8,364 | 0 | 0 | 0.0 |
| 2022 Q3 | 8,437 | 3 | 0 | 355.6 |
| 2022 Q2 | 8,249 | 0 | 0 | 0.0 |
| 2022 Q1 | 5,234 | 1 | 0 | 191.1 |
| 2021 Q4 | 6,269 | 0 | 0 | 0.0 |
| 2021 Q3 | 5,506 | 3 | 0 | 544.9 |
| 2021 Q2 | 6,335 | 0 | 0 | 0.0 |
| 2021 Q1 | 4,599 | 3 | 2 | 652.3 |
| 2020 Q4 | 5,425 | 0 | 0 | 0.0 |
| 2020 Q3 | 6,065 | 0 | 0 | 0.0 |
| 2020 Q2 | 6,896 | 5 | 0 | 725.1 |
| 2020 Q1 | 8,080 | 1 | 0 | 123.8 |
| 2019 Q4 | 7,181 | 0 | 0 | 0.0 |
| 2019 Q3 | 6,732 | 6 | 0 | 891.3 |
| 2019 Q2 | 5,988 | 0 | 0 | 0.0 |
| 2019 Q1 | 5,074 | 0 | 0 | 0.0 |
| 2018 Q4 | 6,425 | 0 | 0 | 0.0 |
| 2018 Q3 | 6,417 | 0 | 0 | 0.0 |
| 2018 Q2 | 7,331 | 1 | 0 | 136.4 |
| 2018 Q1 | 5,581 | 0 | 0 | 0.0 |
| 2017 Q4 | 8,740 | 2 | 1 | 228.8 |
| 2017 Q3 | 6,772 | 0 | 0 | 0.0 |
| 2017 Q2 | 5,875 | 2 | 1 | 340.4 |
| 2017 Q1 | 7,089 | 1 | 0 | 141.1 |
| 2016 Q4 | 5,928 | 0 | 0 | 0.0 |
| 2016 Q3 | 7,872 | 0 | 0 | 0.0 |
| 2016 Q2 | 5,992 | 0 | 0 | 0.0 |
| 2016 Q1 | 5,753 | 0 | 0 | 0.0 |
| 2015 Q4 | 7,799 | 2 | 1 | 256.4 |
| 2015 Q3 | 8,626 | 2 | 0 | 231.9 |
| 2015 Q2 | 6,969 | 0 | 0 | 0.0 |
| 2015 Q1 | 5,337 | 0 | 0 | 0.0 |
| 2014 Q4 | 4,514 | 0 | 0 | 0.0 |
| 2014 Q3 | 5,157 | 2 | 0 | 387.8 |
| 2014 Q2 | 4,602 | 0 | 0 | 0.0 |
| 2014 Q1 | 4,978 | 0 | 0 | 0.0 |
| 2013 Q4 | 6,778 | 0 | 0 | 0.0 |
| 2013 Q3 | 3,585 | 0 | 0 | 0.0 |
| 2013 Q2 | 0 | 0 | 0 | |
| 2013 Q1 | 0 | 0 | 0 |
No fatalities recorded at this mine.
Reportable incidents
3 on file2026 · 2 incidents
Ideker Mining LLC · Struck by falling object
Miner was loading the heading of decline project when a section of shale from the roof fell striking EE in the basket of the Anfo Loader.
2022 · 1 incident
December 27, 2022
MO · Metal/Non-Metal
maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech
HANDLING OF MATERIALS
Ideker Inc · Caught in, under or between (Not Elsewhere Classified)
Maintenance employee was dismounting a 740 Haul truck using three points of contact. When stepping off the last step, the employee got hand pinched between the handrail and a step causing a laceration to the back of the right hand. The employee was taken to urgent care where employee received 5 stitches.