Mining Incidents

Hamilton Quarry: 13 MSHA citations Metal/Non-Metal

Byron, WI, Fond Du Lac County, WI  ·  Active
MSHA Mine ID: 4703664

Hamilton Quarry has $2K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

Watch this mine

Email me when a new MSHA incident is filed at Hamilton Quarry.

Fatalities
0
Total incidents
24
Years on record
2016–2026
Latest incident
Feb 2026
Compliance record
MSHA citations since 2014
13
citations
1
significant & substantial
$2,300
proposed penalties
$2,300
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2012
24
inspections on record
293
inspection hours
n/a
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: 293 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Hamilton Quarry has $2K in proposed MSHA penalties and $0 outstanding across 1 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.
$2K
proposed penalties
$2K
current assessed
$2K
paid to date
$0
outstanding
13 assessments are final orders; 1 contested dockets.
Of $118 in penalties contested before the Commission, $118 was upheld in final decisions.
As of the most recent assessment on 2026-02-10.
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.
7.7%
significant & substantial
7.7%
high negligence or reckless
7.7%
reasonably likely or greater
23.1%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 15.4% low, 76.9% moderate, 7.7% high, 0.0% reckless.
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.
1 citations taken to the federal commission · 8% of citations on record
  • Stood as issued 1 · 100%
0%
Penalty reduction in decided contests
$118 proposed, $118 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 2018-12-19.
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.
Docket Decision Judge Year Proposed / upheld
LAKE 2019-0126 Dismissal Bulluck 2019 $118 → $118
Source: FMSHRC civil penalty dockets and decisions (public record), 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: 2026-02-11
0%
of limit-tested samples over the exposure limit
7
samples
2
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz3
  • Respirable dust, <.1mg2
  • Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (7)
Date Contaminant Concentration Limit Conc / limit Occupation
2026-02-11 Quartz, respirable, >1% Qtz 0.44 Cutting Mach Operator
2026-02-11 Quartz, respirable, >1% Qtz 0.68 2.13 0.32 Stone Polisher/Cutter
2026-02-11 Quartz, respirable, >1% Qtz 0.87 2.08 0.42 Stone Polisher/Cutter
2018-10-30 Respirable dust, <.1mg 0 Front-end Loader Operator
2018-10-30 Unlisted Particulate, respirable, <1% Qtz 0.16 Laborer, Bullgang
2018-10-30 Respirable dust, <.1mg 0 Front-end Loader Operator
2018-10-30 Unlisted Particulate, respirable, <1% Qtz 0.22 Laborer, Bullgang
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.

Hamilton Quarry recorded 5.27 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.
5.27
total case rate
2.64
days-away rate
0.000
fatality rate
Above 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 Wisconsin, metal and nonmetal mining averaged 1.80 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 * 5.27 2.64 0.000
2024 * 12.23 0.00 0.000
2023 * 9.07 0.00 0.000
2022 * 2.37 0.00 0.000
2021 * 24.47 3.06 0.000
2020 * 14.48 3.62 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
  1. Halquist Stone Company Inc 2012 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 36
2025 34
2024 30
2023 31
2022 40
2021 30
2020 23
2019 15
2018 13
2017 11
2016 9
2015 6
2014 6
2013 3
2012 3
Source: MSHA quarterly employment and production, updated weekly.

Hamilton Quarry sits in Fond du Lac County, Wisconsin, 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.
Fond du Lac County, Wisconsin · Population 104,053
0.2%
Mining share of county employment
$73,154
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 20,859 0 0 0.0
2026 Q1 15,022 2 1 133.1
2025 Q4 21,329 0 0 0.0
2025 Q3 20,648 0 0 0.0
2025 Q2 20,936 0 0 0.0
2025 Q1 12,934 0 0 0.0
2024 Q4 17,755 1 0 56.3
2024 Q3 17,713 0 0 0.0
Show 48 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 17,803 2 0 112.3
2024 Q1 12,117 0 0 0.0
2023 Q4 16,274 0 0 0.0
2023 Q3 16,201 1 0 61.7
2023 Q2 17,672 0 0 0.0
2023 Q1 16,022 0 0 0.0
2022 Q4 22,208 0 0 0.0
2022 Q3 24,099 0 0 0.0
2022 Q2 22,430 3 0 133.7
2022 Q1 15,507 0 0 0.0
2021 Q4 18,993 1 0 52.7
2021 Q3 17,679 0 0 0.0
2021 Q2 16,977 0 0 0.0
2021 Q1 11,735 0 0 0.0
2020 Q4 14,770 0 0 0.0
2020 Q3 16,084 0 0 0.0
2020 Q2 14,552 0 0 0.0
2020 Q1 9,840 0 0 0.0
2019 Q4 9,831 0 0 0.0
2019 Q3 10,287 0 0 0.0
2019 Q2 9,914 0 0 0.0
2019 Q1 4,240 0 0 0.0
2018 Q4 6,382 2 0 313.4
2018 Q3 6,717 0 0 0.0
2018 Q2 8,625 0 0 0.0
2018 Q1 7,466 0 0 0.0
2017 Q4 7,837 0 0 0.0
2017 Q3 7,285 0 0 0.0
2017 Q2 4,843 0 0 0.0
2017 Q1 3,871 0 0 0.0
2016 Q4 5,653 0 0 0.0
2016 Q3 6,522 0 0 0.0
2016 Q2 3,222 0 0 0.0
2016 Q1 2,545 0 0 0.0
2015 Q4 5,042 0 0 0.0
2015 Q3 4,488 0 0 0.0
2015 Q2 2,358 0 0 0.0
2015 Q1 1,095 0 0 0.0
2014 Q4 1,733 0 0 0.0
2014 Q3 3,885 1 0 257.4
2014 Q2 4,251 0 0 0.0
2014 Q1 1,714 0 0 0.0
2013 Q4 1,875 0 0 0.0
2013 Q3 2,007 0 0 0.0
2013 Q2 1,417 0 0 0.0
2013 Q1 0 0 0
2012 Q4 1,701 0 0 0.0
2012 Q3 879 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

24 on file

2026 · 1 incident

February 5, 2026 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Struck by... (Not Elsewhere Classified)

EE was splitting stone with hammer and chisel. The Chisel slipped in EE's hand, and EE accidentally struck EE's thumb with the hammer.

2025 · 2 incidents

June 24, 2025 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion in pulling or pushing objects

EE pushing stone off forks onto a pallet and felt abdomen pain.

April 29, 2025 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Caught in, under or between a moving and a stationary object

EE lifting stone in quarry, stone shifted and pinched finger between stone and quarry floor.

2024 · 4 incidents

November 14, 2024 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Over-exertion in wielding or throwing objects

EE splitting stone, went to swing, but stone split mid swing causing EE to swing and not hit anything.

August 12, 2024 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Struck by flying object

Employee was splitting field stone when a piece of EE's chisel broke off and hit EE's knee.

June 24, 2024 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Struck by flying object

EE working in quarry splitting stone using chisel, piece came off chisel and hit knee and was stuck in skin.

January 18, 2024 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Halquist Stone Company Inc · Over-exertion (Not Elsewhere Classified)

EE was carrying a stone, left foot slipped but EE caught self and felt pain.

2023 · 3 incidents

November 2, 2023 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by falling object

EE was adjusting a piece of flag stone to be stacked, another piece that was already stacked fell, hitting EE in the foot.

June 6, 2023 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by falling object

EE carrying stone, stone slipped in hands and fell on right foot.

February 28, 2023 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion (Not Elsewhere Classified)

EE carrying stone in quarry, slipped and felt pain in back.

2022 · 1 incident

August 6, 2022 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Struck by... (Not Elsewhere Classified)

EE using chisel to split stone, missed chisel and hit finger

2021 · 8 incidents

November 5, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion in lifting objects

EE was picking up a stone approximately 150 lbs., twisted to put it on a pallet, and felt lower back pain.

November 3, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by rolling or sliding object

EE picked up stone approximately 80-120 lbs., set it on EE's thighs, rolled stone towards chest, adjusted grip on the stone, and set it on the pallet. When the stone rolled up and towards EE's chest it contacted EE's left ribs, resulting in a fracture.

August 3, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion in lifting objects

Employee was stacking large stone when EE felt pain in EE's elbows and wrists. The condition worsened over time. Employee sought medical care on 10/29/21. EE was diagnosed with joint pain. Injury was determined reportable on 10/29/21.

May 12, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by falling object

On Wednesday, 5/12/21, at 2:48 pm, employee moved a stone forward on the feeder conveyor towards the breaker. They lifted it with the lifter table. EE then attempted to spin the stone with left hand when the stone slipped off the lifter table and fell. When the stone fell it pinched their left 2nd digit in between it and the feeder conveyor resulting in a laceration/open wound.

April 23, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by falling object

EE was pulling stone on a breaker feeder table when a small piece broke off, fell off the table, and contacted the top of EE's left ankle resulting in a laceration.

April 16, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Halquist Stone Company Inc · Fall from machine

At 9:45 am on Friday, 4/16/21, employee was attempting to climb over a conveyor, when a foot became stuck in a pallet, employee lost balance, and fell sideways onto the concrete floor, hitting left shoulder on the floor.

March 29, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Halquist Stone Company Inc · Over-exertion in wielding or throwing objects

EE reported left shoulder pain to the supervisor. EE felt pain in the shoulder when EE was swinging a hammer to hit a chisel on a piece of stone.

January 7, 2021 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Halquist Stone Company Inc · Over-exertion (Not Elsewhere Classified)

EE was sorting and stacking stone in the Hamilton Quarry. EE picked up a piece of stone and was carrying it out of the stone pile when EE slipped and twisted EE's back.

2020 · 4 incidents

August 24, 2020 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Struck by falling object

Employee was stacking stone on a pallet when a piece of stone fell off the pallet and struck EE in the hip and foot resulting in contusions.

June 30, 2020 WI · Metal/Non-Metal miner, prospector, nec HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion in lifting objects

Employee was sorting and stacking stone in the quarry. EE lifted a 50 lb. stone and felt pain in EE's lower back.

June 16, 2020 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Caught in, under or between a moving and a stationary object

At 4:00 pm on Tuesday, 6/16/20, EE was feeding a splitter at the Hamilton Shop. EE was turning a stone on the turn table on the feeder table when the stone moved suddenly and EE's left 4th finger was pinched between the stone and a piece of steel on the feeder table, resulting in a laceration.

May 27, 2020 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Over-exertion in pulling or pushing objects

Employee pushed a stone onto a pallet and felt lower back pain.

2016 · 1 incident

September 16, 2016 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Halquist Stone Company Inc · Caught in, under or between (Not Elsewhere Classified)

Employee was setting down a rock resulting in a fracture to left fifth finger.