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: 474 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.
2
Section 107(a) orders
Most recent order: 2019-04-18.
On record since 2016.
Source: MSHA imminent-danger order records, updated weekly.
A/C H 4000 has $11K 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.
$11K
proposed penalties
$11K
current assessed
$11K
paid to date
$0
outstanding
75 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-05-28.
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.
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: 2023-03-28, 3 years ago
0%
of limit-tested samples over the exposure limit
11
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg10
Quartz, respirable, >1% Qtz1
Show the individual readings (11)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-03-28
Respirable dust, <.1mg
0
Laborer, Bullgang
2023-03-28
Respirable dust, <.1mg
0
Front-end Loader Operator
2023-03-28
Respirable dust, <.1mg
0
Supervisor, Co. Official
2019-11-20
Respirable dust, <.1mg
0
Building Repair/Maint.
2019-11-20
Respirable dust, <.1mg
0
Building Repair/Maint.
2019-11-20
Respirable dust, <.1mg
0
Building Repair/Maint.
2016-05-17
Respirable dust, <.1mg
0
Crusher Oper/Worker
2016-05-17
Quartz, respirable, >1% Qtz
0.24
0.9
0.27
Supervisor, Co. Official
2016-05-17
Respirable dust, <.1mg
0
Front-end Loader Operator
2004-09-22
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2004-09-22
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
1
2025
4
2024
2
2023
4
2022
4
2021
4
2020
4
2019
4
2018
4
2017
3
2016
3
2015
4
2014
1
2013
2
2012
3
2011
3
2010
1
2009
2
2008
3
2007
3
2006
3
2005
3
2004
3
2003
2
2002
1
2001
4
2000
4
Source: MSHA quarterly employment and production, updated weekly.
A/C H 4000 sits in Cass County, Michigan, 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.
Cass County, Michigan · Population 51,606
0.1%
Mining share of county employment
$68,011
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
WHILE CLEANING A BIN THE VICTIM FELL ONTO A MOVE CONV. BELT AND WAS DRAWN UNDER THE MOTOR MOUNT CAUSING A FRACTURED LEFT HIP AND CUTS AND SCRAPES OF THE LEFT LEG.