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: 188 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Greyhawk has $6K 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.
$6K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
42 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-03-18.
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: 2019-03-27, 7 years ago
2
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg2
Show the individual readings (2)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2019-03-27
Respirable dust, <.1mg
0
Supervisor, Co. Official
2019-03-27
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
2
2025
4
2024
4
2023
4
2022
4
2021
8
2020
4
2019
4
2018
3
2017
3
2016
4
Source: MSHA quarterly employment and production, updated weekly.
Greyhawk sits in Columbia County, Wisconsin, 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.
Columbia County, Wisconsin · Population 58,322
0.1%
Mining share of county employment
$82,792
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
1,528
0
0
0.0
2026 Q1
0
0
0
2025 Q4
3,498
0
0
0.0
2025 Q3
2,269
0
0
0.0
2025 Q2
1,225
0
0
0.0
2025 Q1
2,014
3
0
1489.6
2024 Q4
2,682
0
0
0.0
2024 Q3
2,360
0
0
0.0
Show 31 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
733
1
0
1364.3
2024 Q1
0
0
0
2023 Q4
1,249
0
0
0.0
2023 Q3
1,347
0
0
0.0
2023 Q2
846
0
0
0.0
2023 Q1
509
0
0
0.0
2022 Q4
834
2
0
2398.1
2022 Q3
629
0
0
0.0
2022 Q2
3,578
5
0
1397.4
2022 Q1
787
0
0
0.0
2021 Q4
91
0
0
0.0
2021 Q3
2,407
5
0
2077.3
2021 Q2
3,333
0
0
0.0
2021 Q1
2,993
0
0
0.0
2020 Q4
1,781
0
0
0.0
2020 Q3
3,886
1
1
257.3
2020 Q2
1,586
0
0
0.0
2020 Q1
0
0
0
2019 Q4
1,492
0
0
0.0
2019 Q3
1,383
0
0
0.0
2019 Q2
436
0
0
0.0
2019 Q1
322
3
0
9316.8
2018 Q4
848
0
0
0.0
2018 Q3
1,663
4
0
2405.3
2018 Q2
1,086
0
0
0.0
2018 Q1
0
0
0
2017 Q4
586
0
0
0.0
2017 Q3
2,058
9
2
4373.2
2017 Q2
872
0
0
0.0
2017 Q1
0
0
0
2016 Q4
756
9
2
11904.8
No fatalities recorded at this mine.
Reportable incidents
7 on file
2025 · 1 incident
January 22, 2025WI · Metal/Non-Metalbeltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor riderHANDLING OF MATERIALS
Miner was setting up crushing spread when EE's legs got pinched between the conveyor and crushing plant. Received stitches on EE's right leg and swelling. No broken bones.
March 7, 2022WI · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerSLIP OR FALL OF PERSON
Miner was moving Large boulder in bucket and the boulder rolled off the bucket causing the loader to jump from the weight being undistributed. Miner banged forehead and got a small cut on forehead that required 5 stitches.
2020 · 1 incident
May 27, 2020WI · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
Employee was doing pre inspection on conveyor and wanted to move a large rock off of conveyor and while moving the rock the rock pinched EE's pinky between the rock and metal part of the conveyor. Had to have surgery to repair pinky.
A leased dump truck was dumping aggregate on the floor of our pit and the truck tipped over on the drivers side as the dump box was lifting. The driver sustained 3 fractured vertebrae and a bulging disc due to the impact of the tip. They were not wearing a seatbelt at the time. The driver was taken by ambulance but later released.