Mining Incidents

Sparta, WI Plant: 41 MSHA citations Metal/Non-Metal

Controlled by USS Holdings Inc
Sparta, Monroe County, WI  ·  Active
MSHA Mine ID: 4703644

Sparta, WI Plant has $6K in proposed MSHA penalties and $0 outstanding across 3 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
19
Years on record
2012–2025
Latest incident
Feb 2025
Compliance record
MSHA citations since 2012
41
citations
9
significant & substantial
$6,162
proposed penalties
$6,162
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
39
inspections on record
1,110
inspection hours
3.7
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.
41 citations across 1,110 inspection hours.
Source: MSHA inspections data, updated weekly.

Sparta, WI Plant has $6K 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.
$6K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
38 assessments are final orders; 3 contested dockets.
Of $2K in penalties contested before the Commission, $1K was upheld in final decisions.
As of the most recent assessment on 2024-01-17.
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.
22.0%
significant & substantial
4.9%
high negligence or reckless
22.0%
reasonably likely or greater
19.5%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 48.8% low, 46.3% moderate, 4.9% 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.
6 citations taken to the federal commission · 15% of citations on record
  • Settled 3 · 50%
  • Vacated or withdrawn 3 · 50%
100%
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 3 decided S&S contests · industry: 79%
21%
Penalty reduction in decided contests
$2K proposed, $1K 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 2019-04-30.
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 2013-562M Settlement Barbour 2014 $745 → $745
LAKE 2018-0310 Withdrawal Feldman 2018 $738 → $502
LAKE 2019-0243 Settlement Gill 2019 $242 → $121
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: 2026-01-07
22%
of limit-tested samples over the exposure limit
49
samples
9
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz112 over
  • Respirable dust, <.1mg37
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (49)
Date Contaminant Concentration Limit Conc / limit Occupation
2017-05-09 Quartz, respirable, >1% Qtz 1.45 0.4 3.63 Lab Technician
2016-12-21 Quartz, respirable, >1% Qtz 0.94 0.43 2.19 Lab Technician
2026-01-07 Respirable dust, <.1mg 0 Utility Man
2026-01-07 Respirable dust, <.1mg 0 Building Repair/Maint.
2025-05-21 Respirable dust, <.1mg 0 Lab Technician
2025-05-21 Respirable dust, <.1mg 0 Sand Filler (Dry)
2024-09-05 Respirable dust, <.1mg 0 Scraper Operator
2024-09-05 Respirable dust, <.1mg 0 Utility Man
2023-08-23 Unlisted Particulate, respirable, <1% Qtz 244.43 Sand Filler (Dry)
2023-08-23 Respirable dust, <.1mg 0 Lab Technician
2023-08-23 Respirable dust, <.1mg 0 Utility Man
2022-08-09 Respirable dust, <.1mg 0 Truck Driver
2022-08-09 Respirable dust, <.1mg 0 Lab Technician
2022-08-09 Respirable dust, <.1mg 0 Truck Loader
2022-08-09 Respirable dust, <.1mg 0 Mechanic
2021-02-18 Respirable dust, <.1mg 0 Truck Loader
2021-02-18 Quartz, respirable, >1% Qtz 0.17 Cleanup Man
2019-06-20 Respirable dust, <.1mg 0 Utility Man
2019-06-20 Respirable dust, <.1mg 0 Building Repair/Maint.
2019-06-20 Quartz, respirable, >1% Qtz 0.2 0.39 0.51 Sampler, Dust
2018-04-24 Respirable dust, <.1mg 0 Building Repair/Maint.
2018-04-24 Quartz, respirable, >1% Qtz 0.24 0.47 0.51 Lab Technician
2018-04-24 Respirable dust, <.1mg 0 Front-end Loader Operator
2018-04-24 Quartz, respirable, >1% Qtz 0.17 0.39 0.44 Track Man/Gang
2018-04-24 Quartz, respirable, >1% Qtz 0.33 Yard Engine Operator
2017-08-31 Respirable dust, <.1mg 0 Lab Technician
2017-05-09 Respirable dust, <.1mg 0 Track Man/Gang
2017-05-09 Respirable dust, <.1mg 0 Track Man/Gang
2017-05-09 Respirable dust, <.1mg 0 Track Man/Gang
2017-05-09 Respirable dust, <.1mg 0 Lab Technician
2017-04-04 Respirable dust, <.1mg 0 Kiln/Dryer Operator
2017-04-04 Respirable dust, <.1mg 0 Track Man/Gang
2017-04-04 Respirable dust, <.1mg 0 Building Repair/Maint.
2017-04-04 Respirable dust, <.1mg 0 Utility Man
2017-04-04 Respirable dust, <.1mg 0 Lab Technician
2016-12-21 Respirable dust, <.1mg 0 Building Repair/Maint.
2016-12-21 Respirable dust, <.1mg 0 Front-end Loader Operator
2016-12-21 Quartz, respirable, >1% Qtz 0.28 0.44 0.64 Track Man/Gang
2016-04-27 Respirable dust, <.1mg 0 Utility Man
2016-04-27 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2016-04-27 Respirable dust, <.1mg 0 Truck Loader
2016-04-27 Respirable dust, <.1mg 0 Truck Loader
2016-04-27 Respirable dust, <.1mg 0 Utility Man
2015-05-27 Quartz, respirable, >1% Qtz 0.2 0.38 0.53 Lab Technician
2015-05-27 Respirable dust, <.1mg 0 Utility Man
2014-06-25 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2014-06-25 Quartz, respirable, >1% Qtz 0.16 0.64 0.25 Truck Loader
2013-02-27 Respirable dust, <.1mg 0 Laborer, Bullgang
2013-02-27 Quartz, respirable, >1% Qtz 0.23 1.2 0.19 Mechanic

Area samples (mill and shop air)

Last sampled: 2017-08-31, 8 years ago
1
samples
Show the individual readings (1)
Date Contaminant Concentration Limit Conc / limit Area sampled
2017-08-31 Respirable dust, <.1mg 0 MP DRY LABORATORY
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.

Sparta, WI Plant 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 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 * 0.00 0.00 0.000
2024 * 2.37 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
2019 0.00 0.00 0.000
2018 7.45 0.00 0.000
2017 2.79 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. U S Silica Company 2012 to 2025
  2. U.S.Silica Energy Company 2025 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 34
2025 35
2024 35
2023 40
2022 42
2021 31
2020 29
2019 53
2018 57
2017 59
2016 28
2015 47
2014 65
2013 52
2012 15
Source: MSHA quarterly employment and production, updated weekly.

Sparta, WI Plant sits in Monroe County, Wisconsin, where the Census mining category is 1.6% 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.
Monroe County, Wisconsin · Population 46,169
1.6%
Mining share of county employment
$68,213
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 23,551 0 0 0.0
2026 Q1 20,622 1 1 48.5
2025 Q4 20,432 0 0 0.0
2025 Q3 24,770 0 0 0.0
2025 Q2 23,225 1 0 43.1
2025 Q1 24,776 1 0 40.4
2024 Q4 18,873 0 0 0.0
2024 Q3 23,643 0 0 0.0
Show 45 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 23,217 0 0 0.0
2024 Q1 18,732 2 0 106.8
2023 Q4 20,595 0 0 0.0
2023 Q3 20,708 1 0 48.3
2023 Q2 23,465 0 0 0.0
2023 Q1 23,966 0 0 0.0
2022 Q4 27,234 0 0 0.0
2022 Q3 25,199 1 0 39.7
2022 Q2 21,071 0 0 0.0
2022 Q1 19,632 0 0 0.0
2021 Q4 18,036 0 0 0.0
2021 Q3 23,796 0 0 0.0
2021 Q2 20,663 0 0 0.0
2021 Q1 10,685 2 0 187.2
2020 Q1 16,828 0 0 0.0
2019 Q4 17,189 0 0 0.0
2019 Q3 31,125 0 0 0.0
2019 Q2 31,085 2 0 64.3
2019 Q1 26,829 1 1 37.3
2018 Q4 26,649 0 0 0.0
2018 Q3 35,667 0 0 0.0
2018 Q2 35,550 1 1 28.1
2018 Q1 36,402 0 0 0.0
2017 Q4 38,860 0 0 0.0
2017 Q3 35,622 0 0 0.0
2017 Q2 36,033 2 0 55.5
2017 Q1 32,863 1 0 30.4
2016 Q4 18,240 1 0 54.8
2016 Q3 18,224 0 0 0.0
2016 Q2 17,207 1 0 58.1
2016 Q1 17,100 0 0 0.0
2015 Q4 17,067 1 0 58.6
2015 Q3 20,927 0 0 0.0
2015 Q2 29,700 2 1 67.3
2015 Q1 36,506 4 0 109.6
2014 Q4 46,405 0 0 0.0
2014 Q3 42,025 0 0 0.0
2014 Q2 39,419 1 0 25.4
2014 Q1 33,639 8 3 237.8
2013 Q4 35,654 0 0 0.0
2013 Q3 35,454 0 0 0.0
2013 Q2 33,095 1 0 30.2
2013 Q1 14,766 2 0 135.4
2012 Q4 14,434 0 0 0.0
2012 Q3 8,184 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

19 on file

2025 · 1 incident

February 20, 2025 WI · Metal/Non-Metal FIRE
U S Silica Company · Accident type, without injuries

While operating the Volvo 550 excavator a hydraulic leak started during operation that led to a fire in the engine compartment. The operator observed the fire and safely exited the equipment.

2024 · 1 incident

February 8, 2024 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
U S Silica Company · Fall onto or against objects

While staging material for a maintenance task, the employee tripped over a chain hoist and landed awkwardly on a guard the employee had just removed. The resulting injury was a fracture to the fingertips of both the left ring and middle fingers, as well as five sutures.

2018 · 5 incidents

August 8, 2018 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
U S Silica Company · Over-exertion (Not Elsewhere Classified)

Employee climbed down from haul truck, jumped off bottom step, landed on uneven ground with right foot and rolled ankle. Employee was put on crutches/restrictions on 08/21/18.

June 26, 2018 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
U S Silica Company · Caught in, under or between a moving and a stationary object

Employees were removing a hopper with a chainfall attached. With the hopper secured, last bolt was removed, the employees did not realize hopper was top-heavy, hopper flipped back and crushed employee hand between hopper and HDPE pipe that was below.

May 4, 2018 WI · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger POWERED HAULAGE
U S Silica Company · Struck against a moving object

Employee was driving an end loader feeding material. Employee backed up loader while grasping the steering wheel with left hand and looking over right shoulder, the loader made contact with a hole in the pad area, jarring the employee in the cab. Employee reported incident 06/14/18. PT prescribed 07/05/18

March 13, 2018 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U S Silica Company · Struck by falling object

As ee was removing teeter water piping in the Hydrosizer using a pipe wrench the end of the pipe came out and fell pinching ee thumb between the pipe wrench and the shell of the Hydrosizer steel plate.

January 31, 2018 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
U S Silica Company · Over-exertion (Not Elsewhere Classified)

On 01/31/18, EE reported that while working in the rail yard ee slipped on ice & twisted left ankle. EE was not wearing ice cleats at time of the event. EE was offered & refused medical treatment. On 02/05/18, a medical evaluation and diagnostics revealed a fracture on left ankle. EE was put on restricted duty as of 02/05/18.

2017 · 3 incidents

December 31, 2017 WI · Metal/Non-Metal ELECTRICAL
U S Silica Company · Accident type, without injuries

At 9:02 am an employee noticed flames coming from the rental heater. Three employees tried to use fire extinguishers on the flames but it wouldn't extinguish. They called 911 and the fire dept. came around 9:25 am. and extinguished the fire by 9:38 am. The United rental heater was a 2012 Almand MH1000 which was a total loss.

June 14, 2017 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
U S Silica Company · Struck by... (Not Elsewhere Classified)

While doing a screen change on a Rotex Mineral Separator, an operator was tightening a bolt with a wrench. The wrench slipped and the operator's hand contacted an edge on the equipment. The operator suffered a laceration on right hand (third finger) that required 4 stitches.

February 3, 2017 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
U S Silica Company · Fall onto or against objects

At night, a Maintenance Tech slipped on a sanded patch of ice and fell to the ground - hitting face. The upper rim of safety glasses cut forehead / brow directly above left eyebrow. EE was taken to the local hospital where EE received 5 stitches to close the wound. EE returned to work to finish the shift. EE has not missed any regularly scheduled work.

2016 · 1 incident

August 13, 2016 WI · Metal/Non-Metal FIRE
U S Silica Company · Accident type, without injuries

Abandoned farmhouse at entrance to mine property was set on fire / arson. Fire was not the cause of mining operations. No miners were at risk as plant was shut down for weekend - no shift at work. Building had no electricity or active heating sources. Fire Marshal investigated scene on 08/14/16 and indicated suspicious cause - most likely arson.

2015 · 1 incident

March 31, 2015 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U S Silica Company · Caught in, under or between a moving and a stationary object

Operator was tightening a bolt on a pipe flange with a wrench when the wrench slipped off the bolt, pinching his finger between the wrench and a beam. Operator was wearing gloves at the time.

2014 · 2 incidents

July 8, 2014 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
U S Silica Company · Bodily reaction, (Not Elsewhere Classified)

Squatting down to move into work position and felt knee pop. Treated using first aid until 9-26-14 when it became reportable due to medical treatment.

May 13, 2014 WI · Metal/Non-Metal miner, prospector, nec OTHER
U S Silica Company · (Not Elsewhere Classified)

A Service Worker suffered a fatal heart attack at a residential property owned by the company and adjacent to the active mine site. The Service Worker was removing an inactive LP gas tank when he fell ill. EMS was called by his coworker, and the victim was rushed to a local hospital. The fatality was due to natural causes and was not related to any mining activities.

2012 · 5 incidents

November 27, 2012 WI · Metal/Non-Metal electrician, lineman HANDTOOLS (NONPOWERED)
U S Silica Company · Caught in, under or between (Not Elsewhere Classified)

Employee was using a hand bender to straighten out a ground rod. His right, ring finger became stuck in the frame work of the bender. As he put pressure on the board, the momentum of his body caused the bender to twist. This forced his finger to twist in a sideways direction, ultimately, resulting in a finger fracture.

October 19, 2012 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
U S Silica Company · Fall from scaffolds, walkways, platforms

EE was working on a scaffold approx. 5 feet high, cutting a lentle over the door to the Dryer MCC bldg. the saw hit a piece of rebar causing it to bind and kick back. This action caused the scaffold to move near the edge of the concrete stoop it was on. EE lost his balance during this move, causing him to fall. A spotter was with him but unable to react quickly enough.

October 5, 2012 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U S Silica Company · Caught in, under or between a moving and a stationary object

The employee was working with a co-worker to set up a light plant, fading light conditions, poor communication with co-worker, and improper body positioning all contributed to the injury.

September 20, 2012 WI · Metal/Non-Metal electrician, lineman HANDLING OF MATERIALS
U S Silica Company · Over-exertion in pulling or pushing objects

Employee was pulling cable off of a large spool of wire. While he was pulling, he felt a sharp pain in his groin/abdomen. He continued his work shift. Over the weekend the pain and a present bulge did not subside. Employee sought medical treatment on 9/25, where he was diagnosed with an inguinal hernia.

June 14, 2012 WI · Metal/Non-Metal miner, prospector, nec HANDLING OF MATERIALS
U S Silica Company · Struck by... (Not Elsewhere Classified)

Employee was handling rebar and dropped one end and the other end came up and hit him in the neck area causing a laceration and chipped tooth.