Mining Incidents

Piranha Proppant-Load Out Facility: 43 MSHA citations Metal/Non-Metal

Piranha Proppant, LLC · Facility
Controlled by Mammoth Energy Services
New Auburn, Barron County, WI  ·  Abandoned
MSHA Mine ID: 4703675

Piranha Proppant-Load Out Facility has $6K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
14
Years on record
2013–2023
Latest incident
Jun 2023
Compliance record
MSHA citations since 2012
43
citations
5
significant & substantial
$6,233
proposed penalties
$6,030
paid to date
97% of proposed penalties paid to date, a $203 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2012
34
inspections on record
529
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: 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.

Piranha Proppant-Load Out Facility has $6K 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.
$6K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
42 assessments are final orders; 1 contested dockets.
Of $823 in penalties contested before the Commission, $620 was upheld in final decisions.
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.
11.9%
significant & substantial
0.0%
high negligence or reckless
11.9%
reasonably likely or greater
64.3%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 64.3% low, 35.7% moderate, 0.0% 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.
3 citations taken to the federal commission · 7% of citations on record
  • Settled 3 · 100%
50%
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 2 decided S&S contests · industry: 79%
25%
Penalty reduction in decided contests
$823 proposed, $620 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 2015-03-12.
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 2015-0346 Settlement Miller 2015 $823 → $620
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: 2025-03-19
29%
of limit-tested samples over the exposure limit
29
samples
7
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz82 over
  • Respirable dust, <.1mg20
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (29)
Date Contaminant Concentration Limit Conc / limit Occupation
2019-05-14 Quartz, respirable, >1% Qtz 1.19 1.03 1.16 Utility Man
2019-05-14 Quartz, respirable, >1% Qtz 3.5 0.77 4.55 Utility Man
2025-03-19 Respirable dust, <.1mg 0 Utility Man
2025-03-19 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2023-02-01 Respirable dust, <.1mg 0 Cleanup Man
2023-02-01 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2021-12-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2021-12-01 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2021-12-01 Respirable dust, <.1mg 0 Track Man/Gang
2021-12-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2021-12-01 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2020-11-05 Respirable dust, <.1mg 0 Front-end Loader Operator
2020-11-05 Respirable dust, <.1mg 0 Sampler, Dust
2020-11-05 Respirable dust, <.1mg 0 Mechanic
2019-05-14 Quartz, respirable, >1% Qtz 0.2 0.49 0.41 Lab Technician
2019-05-14 Quartz, respirable, >1% Qtz 0.16 Dry Screen Plant Operator
2017-11-14 Quartz, respirable, >1% Qtz 0.16 0.47 0.34 Lab Technician
2017-11-14 Respirable dust, <.1mg 0 Kiln/Dryer Operator
2017-11-14 Quartz, respirable, >1% Qtz 0.13 0.56 0.23 Utility Man
2017-11-14 Respirable dust, <.1mg 0 Utility Man
2016-01-06 Respirable dust, <.1mg 0 Mechanic
2016-01-06 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2016-01-06 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2016-01-06 Respirable dust, <.1mg 0 Mechanic
2013-12-18 Unlisted Particulate, respirable, <1% Qtz 7.61 Front-end Loader Operator
2013-12-18 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2013-12-18 Quartz, respirable, >1% Qtz 0.14 0.45 0.31 Dry Screen Plant Operator
2013-03-20 Quartz, respirable, >1% Qtz 0.19 0.59 0.32 Laborer, Bullgang
2013-03-20 Respirable dust, <.1mg 0 Dry Screen Plant Operator

Area samples (mill and shop air)

Last sampled: 2019-09-10, 7 years ago
2
samples
Show the individual readings (2)
Date Contaminant Concentration Limit Conc / limit Area sampled
2019-09-10 Quartz, respirable, >1% Qtz 0.66 DRY BUILDING A
2019-09-10 Quartz, respirable, >1% Qtz 0.4 DRY BUILDING A
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.

Piranha Proppant-Load Out Facility recorded 0.00 reportable injury cases per 100 full-time workers in 2024.

Injury rate, 2024
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 1.77 and the all-US-mining average was 2.08 cases per 100 workers.
In Wisconsin, metal and nonmetal mining averaged 2.15 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
2024 * 0.00 0.00 0.000
2023 * 3.77 0.00 0.000
2022 * 0.00 0.00 0.000
2021 * 0.00 0.00 0.000
2020 * 0.00 0.00 0.000
2019 1.38 0.00 0.000
2018 0.00 0.00 0.000
2017 * 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. Chieftain Sand and Proppant Barron, LLC 2012 to 2017
  2. Piranha Proppant, LLC 2017 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2025 14
2024 27
2023 33
2022 32
2021 21
2020 22
2019 68
2018 81
2017 28
2016 20
2015 58
2014 89
2013 72
2012 55
Source: MSHA quarterly employment and production, updated weekly.

Piranha Proppant-Load Out Facility sits in Barron County, Wisconsin, where the Census mining category is 0.7% 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.
Barron County, Wisconsin · Population 46,741
0.7%
Mining share of county employment
$64,619
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
2025 Q3 3,987 0 0 0.0
2025 Q2 5,301 0 0 0.0
2025 Q1 4,790 1 1 208.8
2024 Q4 7,500 0 0 0.0
2024 Q3 6,362 0 0 0.0
2024 Q2 7,898 0 0 0.0
2024 Q1 11,698 0 0 0.0
2023 Q4 10,002 0 0 0.0
Show 44 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q3 11,438 0 0 0.0
2023 Q2 13,834 0 0 0.0
2023 Q1 17,768 1 0 56.3
2022 Q4 9,054 0 0 0.0
2022 Q3 23,262 0 0 0.0
2022 Q2 18,828 0 0 0.0
2022 Q1 14,192 0 0 0.0
2021 Q4 11,494 0 0 0.0
2021 Q3 13,098 0 0 0.0
2021 Q2 8,898 0 0 0.0
2021 Q1 4,678 0 0 0.0
2020 Q4 4,822 1 0 207.4
2020 Q3 4,814 1 0 207.7
2020 Q2 4,506 2 0 443.9
2020 Q1 19,938 0 0 0.0
2019 Q4 17,359 0 0 0.0
2019 Q3 48,455 1 0 20.6
2019 Q2 30,116 2 0 66.4
2019 Q1 48,546 0 0 0.0
2018 Q4 47,540 0 0 0.0
2018 Q3 53,970 0 0 0.0
2018 Q2 51,034 0 0 0.0
2018 Q1 38,372 0 0 0.0
2017 Q4 40,386 1 0 24.8
2017 Q3 12,730 1 0 78.6
2017 Q2 2,248 0 0 0.0
2017 Q1 3,141 0 0 0.0
2016 Q4 2,946 0 0 0.0
2016 Q3 9,760 0 0 0.0
2016 Q2 12,344 0 0 0.0
2016 Q1 14,643 1 0 68.3
2015 Q4 13,265 0 0 0.0
2015 Q3 20,226 5 0 247.2
2015 Q2 30,772 0 0 0.0
2015 Q1 42,424 0 0 0.0
2014 Q4 45,402 13 1 286.3
2014 Q3 43,989 1 0 22.7
2014 Q2 43,061 0 0 0.0
2014 Q1 41,400 0 0 0.0
2013 Q4 44,355 4 1 90.2
2013 Q3 38,406 0 0 0.0
2013 Q2 32,582 0 0 0.0
2013 Q1 33,649 2 0 59.4
2012 Q4 28,263 1 0 35.4
No fatalities recorded at this mine.

Reportable incidents

14 on file

2023 · 1 incident

June 13, 2023 WI · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Piranha Proppant, LLC · Struck by falling object

Employee was assisting with removal of conveyor covers. As covers were being handed/lowered to him, accumulated sand fell off and onto the employee.

2019 · 2 incidents

May 13, 2019 WI · Metal/Non-Metal FIRE
Piranha Proppant, LLC · Accident type, without injuries

Dry spring grass was ignited by sparking from carbon build up in locomotive exhaust stack. Damage was limited to grass on property. No equipment or other asset damage. No injuries.

March 26, 2019 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Piranha Proppant, LLC · Over-exertion in lifting objects

Employee was working on 3/26/19 in dry plant shoveling out built up sand. Employee woke up the morning of 3/27/19 with a sore back and went to urgent care. The employee was diagnosed with muscle strain and was given one day off by the attending physician, and a return to work with restrictions until follow up appointment on 4/3/2019.

2015 · 3 incidents

July 29, 2015 WI · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Over-exertion in lifting objects

Employee reported pain in shoulder verbally to supervisor on 7/29 but was unsure if work related or not. Supervisor did not complete an incident report and SH manager was unaware. Employee called on 8/12 to say that employee saw doctor, and doctor thinks there may be herniated disk. Employee is on temporary layoff as of 8/10.

May 13, 2015 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Chieftain Sand and Proppant Barron, LLC · Fall onto or against objects

Employee walking along top of the railcar when SRL locking mechanism engaged pulling the employee back and striking leg against a hatch which caused injury. Employee declined medical attention because he thought it was bruised/sprained. Employee requested medical evaluation on 6/2/15 because it was still sore. Upon evaluation a fractured fibula was discovered.

February 21, 2015 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Over-exertion (Not Elsewhere Classified)

Contract employee injured left knee while attempting to operate a switch which was difficult to move. The employee did not report the incident immediately but tried to self treat. Employee reported the incident on 02/25/2015.

2014 · 6 incidents

December 9, 2014 WI · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Caught in, under or between (Not Elsewhere Classified)

Employee was removing sand from tailgate and pinched fingers.

November 10, 2014 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator STEPPING OR KNEELING ON OBJECT
Chieftain Sand and Proppant Barron, LLC · Struck against stationary object

Employee was walking from a control panel to a check a temperature probe for a kiln. While walking the employee stepped onto the concrete slab of the kiln building with the foot partially overhanging the slight ledge. When the employee put the weight down, it caused the ankle to twist and sprain.

October 14, 2014 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator OTHER
Chieftain Sand and Proppant Barron, LLC · (Not Elsewhere Classified)

Employee audiogram indicated standard threshold shift.

October 7, 2014 WI · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Over-exertion (Not Elsewhere Classified)

Employee was opening up a hatch toward the bottom of a hopper connected to a bucket elevator. The door swung open and hyper extended the employees arm causing a strain to the shoulder.

June 17, 2014 WI · Metal/Non-Metal plumber, pipefitter, millwright HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Struck by... (Not Elsewhere Classified)

EE was removing an electric motor from a conveyor - he was lifting it up and in the process a bolt caught the edge of a guard lying nearby, causing it to fall and hit him in the tooth. When he was hit with the guard, he also dropped the motor on his finger resulting in a cut on his left ring finger.

2013 · 2 incidents

December 10, 2013 WI · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
Chieftain Sand and Proppant Barron, LLC · Struck against stationary object

Employee was attempting to open a rail car hatch. When the hatch broke free, the employee's head went forward striking a part of the car.

February 13, 2013 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Chieftain Sand and Proppant Barron, LLC · Caught in, under or between (Not Elsewhere Classified)

Employee was pushing a high pressure sprayer and lost traction with his footing. When he fell forward the handle on the sprayer pinched his left hand.