Mining Incidents

Tolsa Wyoming Bentonite Plant: 153 MSHA citations Metal/Non-Metal

Controlled by Tolsa S A
Casper, Natrona County, WY  ·  Temporarily Idled
MSHA Mine ID: 4801751

Tolsa Wyoming Bentonite Plant has $102K in proposed MSHA penalties and $0 outstanding across 8 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
23
Years on record
2011–2024
Latest incident
Mar 2024
Compliance record
MSHA citations since 2011
153
citations
53
significant & substantial
$101,800
proposed penalties
$92,387
paid to date
91% of proposed penalties paid to date, a $9,413 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2011
53
inspections on record
895
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: 895 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
A Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
2
Section 107(a) orders
Most recent order: 2022-03-31.
On record since 2022.
Source: MSHA imminent-danger order records, updated weekly.

Tolsa Wyoming Bentonite Plant has $102K in proposed MSHA penalties and $0 outstanding across 8 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.
$102K
proposed penalties
$92K
current assessed
$92K
paid to date
$0
outstanding
151 assessments are final orders; 8 contested dockets.
Of $51K in penalties contested before the Commission, $37K was upheld in final decisions.
As of the most recent assessment on 2025-07-17.
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.
35.1%
significant & substantial
7.9%
high negligence or reckless
35.1%
reasonably likely or greater
53.6%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 2.6% low, 89.4% moderate, 7.9% 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.
26 citations taken to the federal commission · 17% of citations on record
  • Settled 20 · 77%
  • Stood as issued 5 · 19%
  • Vacated or withdrawn 1 · 4%
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 16 decided S&S contests · industry: 79%
28%
Penalty reduction in decided contests
$51K proposed, $37K 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 2024-11-17.
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
WEST 2021-0286 Settlement Manning 2022 $15K → $7K
WEST 2014-0805 Settlement Lesnick 2015 $9K → $9K
WEST 2022-0255 Default 2022 $9K → $9K
WEST 2025-0067 Settlement Simonton 2025 $5K → $5K
WEST 2013-566M Withdrawal Manning 2013 $5K → $0
WEST 2013-1015M Settlement Lesnick 2014 $3K → $3K
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: 2022-10-14, 3 years ago
69%
of limit-tested samples over the exposure limit
24
samples
13
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz179 over
  • Cristobalite, respirable4
  • Respirable dust, <.1mg2
  • Fibers, >5um1
Show the individual readings (24)
Date Contaminant Concentration Limit Conc / limit Occupation
2022-07-18 Quartz, respirable, >1% Qtz 1.03 0.9 1.14 Utility Man
2022-04-04 Quartz, respirable, >1% Qtz 1.88 0.68 2.76 Cleanup Man
2022-04-04 Quartz, respirable, >1% Qtz 3.32 0.59 5.63 Bagging Operator
2022-04-04 Quartz, respirable, >1% Qtz 1.52 0.66 2.30 Bagging Operator
2016-09-27 Quartz, respirable, >1% Qtz 1.23 0.76 1.62 Bagging Operator
2013-04-09 Quartz, respirable, >1% Qtz 1.27 0.66 1.92 Bagging Operator
2013-01-08 Quartz, respirable, >1% Qtz 1.49 0.72 2.07 Packaging Operations Worker
2012-09-25 Quartz, respirable, >1% Qtz 0.87 0.57 1.53 Bagging Operator
2012-07-11 Quartz, respirable, >1% Qtz 1.67 0.55 3.04 Bagging Operator
2022-10-14 Respirable dust, <.1mg 0 Crusher Oper/Worker
2022-10-14 Quartz, respirable, >1% Qtz 0.19 Lab Technician
2022-07-18 Quartz, respirable, >1% Qtz 0.17 Bagging Operator
2022-07-18 Quartz, respirable, >1% Qtz 0.59 0.92 0.64 Bagging Operator
2022-04-04 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-06-18 Cristobalite, respirable 0.13 Packaging Operations Worker
2019-06-18 Quartz, respirable, >1% Qtz 0.28 0.9 0.31 Packaging Operations Worker
2019-06-18 Fibers, >5um 0.01 Packaging Operations Worker
2019-06-18 Cristobalite, respirable 0.28 Packaging Operations Worker
2019-06-18 Cristobalite, respirable 0.2 Packaging Operations Worker
2019-06-18 Quartz, respirable, >1% Qtz 0.13 Packaging Operations Worker
2019-06-18 Quartz, respirable, >1% Qtz 0.2 Packaging Operations Worker
2016-11-22 Quartz, respirable, >1% Qtz 0.15 0.75 0.20 Bagging Operator
2016-09-27 Quartz, respirable, >1% Qtz 0.91 0.96 0.95 Forklift Operator
2012-07-11 Cristobalite, respirable 0 Bagging Operator

Area samples (mill and shop air)

Last sampled: 2013-08-20, 13 years ago
7
samples
Show the individual readings (7)
Date Contaminant Concentration Limit Conc / limit Area sampled
2013-08-20 Quartz, respirable, >1% Qtz 2.05 MP PELLETIZING
2013-08-20 Quartz, respirable, >1% Qtz 0.37 MP BAGGING/PACKING
2013-08-20 Quartz, respirable, >1% Qtz 0.25 MP BAGGING/PACKING
2013-08-20 Quartz, respirable, >1% Qtz 0.23 MP BAGGING/PACKING
2013-08-20 Quartz, respirable, >1% Qtz 0.63 MP BAGGING/PACKING
2013-08-20 Quartz, respirable, >1% Qtz 0.91 MP GENERAL
2013-08-20 Quartz, respirable, >1% Qtz 0.79 MP PELLETIZING
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.

Tolsa Wyoming Bentonite Plant recorded 0.00 reportable injury cases per 100 full-time workers in 2021.

Injury rate, 2021
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 1.87 and the all-US-mining average was 2.19 cases per 100 workers.
In Wyoming, metal and nonmetal mining averaged 2.13 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
2021 * 0.00 0.00 0.000
2018 * 0.00 0.00 0.000
2013 * 20.74 6.91 0.000
2012 * 12.29 2.05 0.000
2011 * 22.23 13.34 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. US Bentonite Processing, Inc 2010 to 2015
  2. Tolsa Wyoming Bentonite 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2025 6
2024 7
2023 8
2022 9
2021 12
2020 13
2019 28
2018 32
2017 28
2016 25
2015 14
2013 51
2012 55
2011 31
2010 8
Source: MSHA quarterly employment and production, updated weekly.

Tolsa Wyoming Bentonite Plant sits in Natrona County, Wyoming, where the Census mining category is 6.5% 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.
Natrona County, Wyoming · Population 79,735
6.5%
Mining share of county employment
$71,247
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 1,712 4 0 2336.4
2025 Q2 2,987 0 0 0.0
2025 Q1 2,712 0 0 0.0
2024 Q4 3,107 7 2 2253.0
2024 Q3 2,766 23 3 8315.3
2024 Q2 3,462 0 0 0.0
2024 Q1 3,554 9 6 2532.4
2023 Q4 3,544 0 0 0.0
Show 48 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q3 3,557 11 2 3092.5
2023 Q2 3,480 0 0 0.0
2023 Q1 3,174 0 0 0.0
2022 Q4 3,184 4 2 1256.3
2022 Q3 3,787 11 3 2904.7
2022 Q2 3,984 11 5 2761.0
2022 Q1 4,960 5 2 1008.1
2021 Q4 7,611 0 0 0.0
2021 Q3 4,645 0 0 0.0
2021 Q2 6,153 11 7 1787.7
2021 Q1 7,440 0 0 0.0
2020 Q4 7,200 0 0 0.0
2020 Q3 6,240 0 0 0.0
2020 Q2 3,007 1 0 332.6
2020 Q1 1,000 13 4 13000.0
2019 Q4 1,460 0 0 0.0
2019 Q3 2,696 0 0 0.0
2019 Q2 1,840 2 0 1087.0
2019 Q1 1,752 7 3 3995.4
2018 Q4 13,486 0 0 0.0
2018 Q3 12,778 0 0 0.0
2018 Q2 1,768 0 0 0.0
2018 Q1 2,288 0 0 0.0
2017 Q4 1,827 2 0 1094.7
2017 Q3 2,688 0 0 0.0
2017 Q2 2,232 1 0 448.0
2017 Q1 2,016 7 5 3472.2
2016 Q4 2,160 1 0 463.0
2016 Q3 1,512 3 1 1984.1
2016 Q2 1,024 0 0 0.0
2016 Q1 1,488 2 0 1344.1
2015 Q4 896 0 0 0.0
2015 Q3 1,064 0 0 0.0
2015 Q2 1,024 1 0 976.6
2015 Q1 552 1 0 1811.6
2013 Q4 18,922 0 0 0.0
2013 Q3 24,608 0 0 0.0
2013 Q2 20,857 2 2 95.9
2013 Q1 22,405 2 1 89.3
2012 Q4 19,822 0 0 0.0
2012 Q3 26,089 2 1 76.7
2012 Q2 28,513 1 0 35.1
2012 Q1 23,218 5 2 215.4
2011 Q4 21,202 0 0 0.0
2011 Q3 14,200 0 0 0.0
2011 Q2 6,468 0 0 0.0
2011 Q1 3,120 1 0 320.5
2010 Q4 3,600 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

23 on file

2024 · 1 incident

March 18, 2024 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Tolsa Wyoming Bentonite · Over-exertion (Not Elsewhere Classified)

Employee was climbing down from a CAT Loader and slipped on excessive mud. The employee broke/fractured left ankle.

2019 · 1 incident

August 28, 2019 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Tolsa Wyoming Bentonite · Fall from machine

The operator had informed me that while starting the stoker/furnace it had flashed on EE. EE suffered burns on face as well as right forearm. Due to the flash EE had jumped from the upper deck of the stoker and injured foot, deck is approx. 5' off ground. EE had the loader operator who was on shift drive EE to the E.R.

2016 · 1 incident

May 13, 2016 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HOISTING
Tolsa Wyoming Bentonite · Caught in, under or between a moving and a stationary object

Elevator 310 locked/tagged out due to blockage, pulled front and back plates to clean blockage. EE was using a bar to remove a rock when the buckets broke loose and pulled the bar and EE's left hand and arm into the machine. EE jerked hand back, realized hand and arm were injured. Went to the office to get help.

2013 · 9 incidents

October 30, 2013 WY · Metal/Non-Metal pumper HANDLING OF MATERIALS
US Bentonite Processing, Inc · Absorption of radiations, caustics, toxic and noxious substances

When switching propane tanks he turned shutoff valve closed and disconnected hose, broke the seal. propane squirted out causing freezer burn on R hand (1st and middle fingers)

September 27, 2013 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
US Bentonite Processing, Inc · Caught in, under or between a moving and a stationary object

Employee was adjusting forks on the extendable forklift when his hand holding up fork slipped and the left hand (ring finger) pushing fork was smashed.

September 20, 2013 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator STRIKING OR BUMPING
US Bentonite Processing, Inc · Struck against stationary object

Employee ducked down to go below the conveyor belt that feeds the powder elevator between B&C silos. When passing under the belt, his hard hat hit the bottom of the conveyor and fell off. He continued below the belt until he thought he was clear of the belt. He stood up, hit his head on a water trap which cut his scalp.

August 30, 2013 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
US Bentonite Processing, Inc · Fall to the walkway or working surface

Employee was walking on the stock piles at night, tripped and fell on his left knee

August 9, 2013 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator FIRE
US Bentonite Processing, Inc · Contact with hot objects or substances

Emp. was shrinking a bag over a pallet of bentonite. The plastic caught on fire. Emp. said he shed the fire off of the seed burner & was trying to put the fire out with the end of the weed burner when a piece of plastic lodged on his hand. Emp isn't sure how the plastic got on his hand. He may have swatted at the plastic with it. He doesn't remember

June 5, 2013 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech FALLING/SLIDING/ROLLING MATERIALS
US Bentonite Processing, Inc · Struck by falling object

Adjusting conveyor and a 4" PVC dust line(full of dust) broke from overhead from a distance of 3'. He was hit initially on the hardhat, then in the back of the neck and on the side of the rib cage (letf side)

April 2, 2013 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
US Bentonite Processing, Inc · Over-exertion in lifting objects

EE is not sure of the exact incident. There are a couple of possibilities of when it happened 1)helping another EE move glue barrels 2)re-stacking a pallet or 3)closing a stubborn door on a box car. EE believes it was moving the barrels because he was bent, extended over them and applying force. EE didn't feel pain till he was in car after work/reported next day.

March 4, 2013 WY · Metal/Non-Metal pumper NONPOWERED HAULAGE
US Bentonite Processing, Inc · Over-exertion in pulling or pushing objects

Employee states that while cleaning up, he was wheeling a wheel barrow full of bentonite to the front end loader to empty it into the bucket. He set it down and re-adjusted his grip on the handles. He lifted it up and as he went to push it over to dump, he heard a pop in the left shoulder area. Took to Urgent Care.

2012 · 6 incidents

December 27, 2012 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
US Bentonite Processing, Inc · Over-exertion (Not Elsewhere Classified)

Slipped off the step on grader and twisted back @ 11a; slipped when cleaning our crude elevator with a bar @ 2p, twisted back again.

December 12, 2012 WY · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
US Bentonite Processing, Inc · Struck by... (Not Elsewhere Classified)

Unknown debris on eye.

October 4, 2012 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
US Bentonite Processing, Inc · Over-exertion in lifting objects

Employee was installing an auger-screw & pulled a muscle when lifting the motor into the man basket.

September 26, 2012 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
US Bentonite Processing, Inc · Over-exertion (Not Elsewhere Classified)

EE trying to seal a railcar door, handle wouldn't move. EE opened door again tried closing, couldn't move handle. EE placed all weight on handle to move. Felt hot sharp pain the lower back part of neck and top of back. Tried turn head felt constant sharp pain. It hurts to lift arms, tried stretching and using Advil/Aleve to no avail. Went to Ugent Care

January 9, 2012 WY · Metal/Non-Metal welder (shop) HANDLING OF MATERIALS
US Bentonite Processing, Inc · Struck by... (Not Elsewhere Classified)

Party and co-worker were cutting angle iron off a high beam supporting the blower in the mill building. When the last supporting bolt was cut free the angle iron was lacking support and came falling down. As it fell it caught ee right hand and injured his thumb.

January 4, 2012 WY · Metal/Non-Metal welder (shop) MACHINERY
US Bentonite Processing, Inc · Struck by... (Not Elsewhere Classified)

Party was grinding on medal in the fabrication shop when tiny particles blew under his face shield and eye glasses. They got stuck in his left eye.

2011 · 5 incidents

December 28, 2011 WY · Metal/Non-Metal electrician, lineman SLIP OR FALL OF PERSON
US Bentonite Processing, Inc · Fall to the walkway or working surface

Party was walking into the Pilot Plant from the east door. He didn't see the forks from the forklift flesh with the concrete, at which time he tripped over them. He stumbled several times but was unable to catch himself. When he fell to the ground he landed on his Left side. An act that resulted in an injury to his Left arm, shoulder, hand, elbow and middle back.

November 30, 2011 WY · Metal/Non-Metal ledgeman/hand, quarry man HANDTOOLS (NONPOWERED)
US Bentonite Processing, Inc · Over-exertion (Not Elsewhere Classified)

He was opening a garage door that is difficult to open when he felt pain in his right shoulder. He then proceeded to work on un-clogging the mill feed with a pry bar. While prying the particles apart with a pry bar. While prying downwards the pry bar slipped and put extra strain the his right arm. This slip caused his right shoulder to begin aching. He notified his supervisor.

October 28, 2011 WY · Metal/Non-Metal welder (shop) HANDLING OF MATERIALS
US Bentonite Processing, Inc · Struck by flying object

The employee was cleaning the bag house inside & out when doing so debris made of either coal dust, bentonite or metal came in contact with his R. eye. Employee flushed his eye after the incident happened. over the weekend he states it got worse. Due to irritation he was taken into to where objects was removed.

October 6, 2011 WY · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
US Bentonite Processing, Inc · Over-exertion in wielding or throwing objects

Stacking 50# bags manually. Employee stated he twisted his back while throwing bags.

September 28, 2011 WY · Metal/Non-Metal welder (shop) HANDLING OF MATERIALS
US Bentonite Processing, Inc · Struck by flying object

While EE was removing his safety glasses something fell into his eye. He was unable to remove it with eye wash. We sent him into an instant care facility. They removed it and he was able to come back to work.