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: 844 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
1
Section 107(a) orders
Most recent order: 2022-11-29.
On record since 2022.
Source: MSHA imminent-danger order records, updated weekly.
Louisburg Quarry has $17K in proposed MSHA penalties and $0 outstanding across 3 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.
$17K
proposed penalties
$16K
current assessed
$16K
paid to date
$0
outstanding
99 assessments are final orders; 3 contested dockets.
Of $1K in penalties contested before the Commission, $547 was upheld in final decisions.
As of the most recent assessment on 2025-05-12.
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.
6citations taken to the federal commission · 6% of citations on record
Settled
5 · 83%
Vacated or withdrawn
1 · 17%
0%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 2 decided S&S contests · industry: 79%
59%
Penalty reduction in decided contests
$1K proposed, $547 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 2017-04-26.
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: 2024-08-07
0%
of limit-tested samples over the exposure limit
15
samples
6
limit-tested
Most sampled contaminants
Respirable dust, <.1mg7
Nuisance dust, respirable, <1% Qtz5
Quartz, respirable, >1% Qtz2
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (15)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2024-08-07
Respirable dust, <.1mg
0
Truck Driver
2024-08-07
Quartz, respirable, >1% Qtz
0.26
Crusher Oper/Worker
2024-08-07
Respirable dust, <.1mg
0
Front-end Loader Operator
2020-12-02
Nuisance dust, respirable, <1% Qtz
0.22
10
0.02
Truck Driver
2020-12-02
Respirable dust, <.1mg
0
Bobcat Operator
2020-12-02
Nuisance dust, respirable, <1% Qtz
0.48
10
0.05
Crusher Oper/Worker
2019-09-24
Respirable dust, <.1mg
0
Crusher Oper/Worker
2019-09-24
Respirable dust, <.1mg
0
Laborer, Bullgang
2016-03-01
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-03-01
Unlisted Particulate, respirable, <1% Qtz
0.14
Truck Driver
2011-07-13
Nuisance dust, respirable, <1% Qtz
0.53
10
0.05
Front-end Loader Operator
2011-07-13
Quartz, respirable, >1% Qtz
0.34
1.69
0.20
Drill Operator, Rotary Air
2011-07-13
Respirable dust, <.1mg
0
Truck Driver
2009-09-22
Nuisance dust, respirable, <1% Qtz
0.8
10
0.08
Front-end Loader Operator
2009-09-22
Nuisance dust, respirable, <1% Qtz
0.18
10
0.02
Crusher Oper/Worker
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.
Louisburg 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, 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 Kansas, metal and nonmetal mining averaged 1.88 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 *
8.75
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
8.25
0.00
0.000
2016 *
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
11
2025
12
2024
11
2023
15
2022
13
2021
12
2020
11
2019
12
2018
7
2017
10
2016
12
2015
10
2014
8
2013
6
2012
6
2011
7
2010
11
2009
15
2008
12
2007
17
2006
18
2005
18
2004
16
2003
16
2002
17
2001
28
2000
33
Source: MSHA quarterly employment and production, updated weekly.
Louisburg Quarry sits in Miami County, Kansas, where the Census mining category is 0.1% 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.
Miami County, Kansas · Population 34,625
0.1%
Mining share of county employment
$88,000
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
N R Hamm Quarry LLC · Caught in, under or between a moving and a stationary object
WHILE EMPLOYEE WAS ASSISTING IN CLOSING THE SCREEN CHUTE GATE, EE PLACED RIGHT THUMB IN A PINCH POINT AND INJURED THE RIGHT THUMB. 3 STITCHES TO THE NAIL BED OF RIGHT THUMB.
2019 · 1 incident
February 11, 2019KS · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
EMPLOYEE WAS USING A PRYBAR TO LOOSEN A ROCK. THE BAR GAVE AWAY AND HIT HIM IN THE MOUTH. THE TOP CENTER TOOTH WAS CHIPPED. A RESIN SEAL WAS USED TO REPAIR TOOTH.
March 15, 1999KS · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
EE WAS REPLACING WINDOW IN LOADER WINDOW FELL OVER ONTO LEFT INDEX FINGER REQURED 3 STITCHES AND BROKE INDEX FINGER FINGER WAS SPLINGERED BY DR GENE OVERLAND PARLK
January 13, 1999KS · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanPOWERED HAULAGE
EE WAS ADJUSTING A SCREEN ON A SECONARAY SCALPER. HE REACHED ACROSS THE SHAFT WHEN HIS CLOTHING BECAME IN TANKLED. EE SUFFERED A STRAINED RIGHT ELBOW REQUIRED 3 VISITS TO PHYSCIAL THERAPY EE W AS SUSPENDED A 2 WORKING DAYS FOR FAILURE TO ELBOW POPP SAFETY PREVIOUS.
1998 · 1 incident
August 4, 1998KS · Metal/Non-Metalblaster, shooter, shotfirer, explosive worker, powder gang/monkeySLIP OR FALL OF PERSON
EE WAS DOING MAINTANCE ON BELT WHEN HE SLIPPED AND CAUGHT HIMSELF. EE HAD CONTUSION ON RT HAND. DR INSTRUCTED EE TO NOT USE HAND FOR 2 DAYS. RETURNED TO FULL DUTY THAT DAY.
1997 · 1 incident
September 10, 1997KS · Metal/Non-Metalbelt foreman, maintenance foreman, maintenance supervisorMACHINERY
GRINDING WHEEL SHATTERED. A PIECE OF THE WHEEL LACERATED LOWER ABDOMEN. EMPLOYEE REQUIRED STITCHES TO CLOSE WOUND.
1991 · 1 incident
October 18, 1991KS · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON