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: 529 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Custer has $7K 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.
$7K
proposed penalties
$7K
current assessed
$7K
paid to date
$0
outstanding
53 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2024-11-06.
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: 2025-09-23
0%
of limit-tested samples over the exposure limit
18
samples
3
limit-tested
Most sampled contaminants
Respirable dust, <.1mg14
Quartz, respirable, >1% Qtz3
Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (18)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-09-23
Respirable dust, <.1mg
0
Washer Operator
2021-10-26
Respirable dust, <.1mg
0
Front-end Loader Operator
2021-10-26
Respirable dust, <.1mg
0
Washer Operator
2021-10-26
Respirable dust, <.1mg
0
Front-end Loader Operator
2021-10-26
Respirable dust, <.1mg
0
Front-end Loader Operator
2018-09-25
Respirable dust, <.1mg
0
Screen/Scalper Operator
2018-09-25
Respirable dust, <.1mg
0
Front-end Loader Operator
2018-09-25
Respirable dust, <.1mg
0
Screen/Scalper Operator
2010-06-16
Respirable dust, <.1mg
0
Washer Operator
2010-06-16
Unlisted Particulate, respirable, <1% Qtz
0.12
Front-end Loader Operator
2010-06-16
Respirable dust, <.1mg
0
Front-end Loader Operator
2004-05-26
Respirable dust, <.1mg
0
Crusher Oper/Worker
2004-05-26
Respirable dust, <.1mg
0
Belt Cleaner
2004-05-26
Quartz, respirable, >1% Qtz
0.25
0.51
0.49
Belt Cleaner
2002-06-04
Respirable dust, <.1mg
0
Crusher Oper/Worker
2002-06-04
Quartz, respirable, >1% Qtz
0.3
0.59
0.51
Belt Cleaner
2002-06-04
Quartz, respirable, >1% Qtz
0.19
1.76
0.11
Belt Cleaner
2002-06-04
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.
Custer recorded 0.00 reportable injury cases per 100 full-time workers in 2005.
Injury rate, 2005
ⓘ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
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 3.76 and the all-US-mining average was 4.21 cases per 100 workers.
In Wisconsin, metal and nonmetal mining averaged 7.52 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
2005 *
0.00
0.00
0.000
2004 *
0.00
0.00
0.000
2003 *
0.00
0.00
0.000
2002 *
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
2
2025
2
2024
4
2023
3
2022
3
2021
4
2020
4
2019
4
2018
5
2017
7
2016
7
2015
3
2014
4
2013
3
2012
5
2011
4
2010
5
2009
5
2008
4
2007
5
2006
7
2005
13
2004
13
2003
12
2002
13
2001
9
2000
7
Source: MSHA quarterly employment and production, updated weekly.
Custer sits in Portage County, Wisconsin, where the Census mining category is 0.0% 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.
Portage County, Wisconsin · Population 70,375
0.0%
Mining share of county employment
$73,284
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
EE was dumping a load of material out of the box of a haul truck. The cab was turned slightly which caused the cab to tip slowly on the left side causing EE to slam left hip into armrest in cab
2016 · 2 incidents
September 6, 2016WI · Metal/Non-Metalminer, prospector, necOTHER
County Materials Corp · Absorption of radiations, caustics, toxic and noxious substances
Employee was in the excavator digging in the pit when the bucket struck a ground nest of bees and one flew up and stung employee in the face.
June 30, 2016WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
Installing a new conveyor belt on a concrete sand stacker. While unrolling the belt that was on a metal shaft, the employee placed the belt on the forks of a forklift. The roll twisted off the forks striking him in the right leg causing contusion and bruising to his right leg inside the knee area.
2007 · 1 incident
August 1, 2007WI · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
EE was unloading a PTO shaft for cone @ Metal Crafters for repair. EE of Metal Crafters was helping that person, dropped his end without warning EE. EE was still holding on and caused a shock to hip and lower back. This resulted in a sharp stabbing pain in his lower back and continured discomfort.
Walking out door, dust or shaving blew into left outside edge of eye. Employee was treated for a corneal abrasion from a foreign body under the eyelid.
July 27, 2006WI · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanDISORDERS (PHYSICAL AGENTS)
WAS CLIMBING UP3TO THE BREAKER AND TO USE A STEP WHICH WAS TOO HIGH
1985 · 3 incidents
October 7, 1985WI · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON