Mining Incidents

Lamesa Plant: 179 MSHA citations Metal/Non-Metal

Controlled by USS Holdings Inc
Lamesa, Dawson County, TX  ·  Active
MSHA Mine ID: 4105363

Lamesa Plant has $84K in proposed MSHA penalties and $14K outstanding across 2 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
23
Years on record
2018–2026
Latest incident
Mar 2026
Compliance record
MSHA citations since 2018
179
citations
39
significant & substantial
$83,828
proposed penalties
$67,622
paid to date
81% of proposed penalties paid to date, a $16,206 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2018
51
inspections on record
1,323
inspection hours
13.5
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.
179 citations across 1,323 inspection hours.
Source: MSHA inspections data, updated weekly.

Lamesa Plant has $84K in proposed MSHA penalties and $14K outstanding across 2 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.
$84K
proposed penalties
$82K
current assessed
$68K
paid to date
$14K
outstanding
174 assessments are final orders; 2 contested dockets.
Of $5K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2026-04-01.
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.
21.9%
significant & substantial
5.1%
high negligence or reckless
21.9%
reasonably likely or greater
23.6%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 11.8% low, 83.1% moderate, 5.1% 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.
9 citations taken to the federal commission · 5% of citations on record
  • Settled 8 · 89%
  • Still open 1 · 11%
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 2 decided S&S contests · industry: 79%
48%
Penalty reduction in decided contests
$5K proposed, $2K 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 2026-05-26.
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
CENT 2019-0346 Settlement Simonton 2019 $5K → $2K
CENT 2026-0195 Decision pending
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: 2023-10-19
27%
of limit-tested samples over the exposure limit
27
samples
15
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz174 over
  • Respirable dust, <.1mg9
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (27)
Date Contaminant Concentration Limit Conc / limit Occupation
2019-06-11 Quartz, respirable, >1% Qtz 0.51 0.31 1.65 Cleanup Man
2019-06-11 Quartz, respirable, >1% Qtz 0.53 0.31 1.71 Cleanup Man
2018-12-18 Quartz, respirable, >1% Qtz 0.32 0.29 1.10 Cleanup Man
2018-12-18 Quartz, respirable, >1% Qtz 0.48 0.39 1.23 Cleanup Man
2023-10-19 Quartz, respirable, >1% Qtz 0.14 0.25 0.56 Dry Screen Plant Operator
2023-10-19 Quartz, respirable, >1% Qtz 0.19 0.86 0.22 Sand Filler (Dry)
2023-10-19 Quartz, respirable, >1% Qtz 0.18 0.78 0.23 Sand Filler (Dry)
2023-10-19 Respirable dust, <.1mg 0 Dry Screen Plant Operator
2023-10-19 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-08-30 Quartz, respirable, >1% Qtz 0.2 0.67 0.30 Kiln/Dryer Operator
2023-08-30 Quartz, respirable, >1% Qtz 0.26 0.99 0.26 Dry Screen Plant Operator
2023-08-30 Unlisted Particulate, respirable, <1% Qtz 0.13 Kiln/Dryer Operator
2023-08-30 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-08-30 Quartz, respirable, >1% Qtz 0.28 1.01 0.28 Dry Screen Plant Operator
2020-03-04 Respirable dust, <.1mg 0 Kiln/Dryer Operator
2020-03-04 Quartz, respirable, >1% Qtz 0.25 Kiln/Dryer Operator
2020-03-04 Respirable dust, <.1mg 0 Kiln/Dryer Operator
2020-03-04 Respirable dust, <.1mg 0 Kiln/Dryer Operator
2019-07-10 Respirable dust, <.1mg 0 Cleanup Man
2019-07-10 Respirable dust, <.1mg 0 Cleanup Man
2019-07-10 Quartz, respirable, >1% Qtz 0.13 Cleanup Man
2019-06-11 Quartz, respirable, >1% Qtz 0.21 0.54 0.39 Truck Loader
2019-06-11 Quartz, respirable, >1% Qtz 0.14 0.43 0.33 Cleanup Man
2019-06-11 Quartz, respirable, >1% Qtz 0.19 0.63 0.30 Supervisor, Co. Official
2018-12-18 Respirable dust, <.1mg 0 Electrician Helper
2018-12-18 Quartz, respirable, >1% Qtz 0.16 0.34 0.47 Cleanup Man
2018-12-18 Quartz, respirable, >1% Qtz 0.17 0.35 0.49 Oiler, Greaser
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.

Lamesa Plant recorded 0.81 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.
0.81
total case rate
0.81
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 Texas, metal and nonmetal mining averaged 1.17 cases per 100 workers that year.
Year total case rate days-away fatal
2025 0.81 0.81 0.000
2024 0.00 0.00 0.000
2023 0.00 0.00 0.000
2022 0.64 0.64 0.000
2021 1.81 0.00 0.000
2020 1.04 0.00 0.000
2019 2.96 0.49 0.000
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 Silica Co 2018 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 111
2025 109
2024 118
2023 140
2022 148
2021 110
2020 106
2019 178
2018 103
Source: MSHA quarterly employment and production, updated weekly.

Lamesa Plant sits in Dawson County, Texas, where the Census mining category is 12.9% 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.
Dawson County, Texas · Population 12,311
12.9%
Mining share of county employment
$55,789
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 67,080 13 1 193.8
2026 Q1 65,533 5 1 76.3
2025 Q4 61,062 0 0 0.0
2025 Q3 59,412 4 0 67.3
2025 Q2 63,641 0 0 0.0
2025 Q1 62,894 1 0 15.9
2024 Q4 62,909 0 0 0.0
2024 Q3 64,092 0 0 0.0
Show 25 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 67,184 0 0 0.0
2024 Q1 70,390 16 1 227.3
2023 Q4 71,892 1 0 13.9
2023 Q3 78,614 7 0 89.0
2023 Q2 87,671 0 0 0.0
2023 Q1 85,564 5 0 58.4
2022 Q4 85,874 0 0 0.0
2022 Q3 83,977 0 0 0.0
2022 Q2 77,635 8 2 103.0
2022 Q1 64,162 0 0 0.0
2021 Q4 65,932 11 3 166.8
2021 Q3 55,697 11 1 197.5
2021 Q2 56,367 0 0 0.0
2021 Q1 43,215 7 6 162.0
2020 Q4 41,103 5 0 121.6
2020 Q3 35,968 9 1 250.2
2020 Q2 32,534 0 0 0.0
2020 Q1 82,061 3 0 36.6
2019 Q4 85,109 9 1 105.7
2019 Q3 108,644 1 0 9.2
2019 Q2 112,677 11 2 97.6
2019 Q1 98,618 4 3 40.6
2018 Q4 68,888 9 1 130.6
2018 Q3 62,896 3 3 47.7
2018 Q2 14,340 9 7 627.6
No fatalities recorded at this mine.

Reportable incidents

23 on file

2026 · 1 incident

March 25, 2026 TX · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
U.S. Silica Energy Company · Fall from machine

It is believed that the customer truck driver fell from EE's trailer to the ground while stepping from the trailer to the safe rack. The fall resulted in multiple injuries requiring medical attention and a loss of work days.

2025 · 2 incidents

December 31, 2025 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
U.S. Silica Energy Company · Fall from ladders

Employee fell while preparing to fuel a D6 dozer after a ladder/stool failed, resulting in a right ankle fracture.

July 13, 2025 TX · Metal/Non-Metal electrician, lineman SLIP OR FALL OF PERSON
U.S. Silica Energy Company · Over-exertion (Not Elsewhere Classified)

While descending a stairway, the EE missed a step and landed hard on the outside of right foot, resulting in a fracture to the metatarsal bone. The fracture wasn't discovered until a clinic visit on 7/14/25.

2022 · 2 incidents

July 13, 2022 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
US Silica Co · Bodily reaction, (Not Elsewhere Classified)

Injured had just dismounted their haul truck with both feet on the ground. When the employee turned to walk away the left knee buckled. Diagnosed with a left knee strain.

January 19, 2022 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
US Silica Co · Fall from machine

While attempting to clean the windshield of a haul truck in contradiction of company policy the employee fell to the ground. The fall resulted in a fractured rib and facial bones.

2021 · 2 incidents

January 20, 2021 TX · Metal/Non-Metal car trimmer, car loader, bin puller, truck loader HANDLING OF MATERIALS
US Silica Co · Caught in, under or between a moving and a stationary object

The employee was dumping a dust collector hopper. The hopper would not return to the locked position, so the employee tried locking it manually. In doing so, EE's finger was caught between forklift mast and hopper, transported to the hospital: tuft fracture and stitches to EE's thumb.

January 8, 2021 TX · Metal/Non-Metal car trimmer, car loader, bin puller, truck loader HANDLING OF MATERIALS
US Silica Co · Fall from machine

Due to employees' failure to follow company policy for fall protection, EE fell off a truck. The employee was transported to the medical facility, where they received stitches to right knee. EE also has lacerations on chin, shin, a bone chip in wrist, and a chipped tooth.

2020 · 3 incidents

November 20, 2020 TX · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
US Silica Co · Caught in, under or between a moving and a stationary object

The employee was using a pipe wrench to manually lower the thickener tank rake when the mechanism broke free EE's finger was smashed between structure and wrench.

July 31, 2020 TX · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
US Silica Co · Struck against stationary object

Employee working in a sand dryer repairing the refractory lining. Stepped on a sharp refractory anchor that penetrated the sole of EE's boot. Puncture wound rt. foot.

January 20, 2020 TX · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
US Silica Co · Struck against a moving object

Employee stated that EE felt pain in EE's neck and back when the loader operator dropped a load of sand into EE's haul truck.

2019 · 9 incidents

October 1, 2019 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
US Silica Co · Struck against stationary object

Employee was changing bucket teeth on a loader, hitting the teeth with a sledge hammer, the hammer bounced back and threw their hand into the tooth causing a laceration to their thumb

September 28, 2019 TX · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
US Silica Co · Struck against a moving object

Employee stated they hurt their back when the truck shifted gears. A witness stated the employee was frustrated with having to work and slammed themselves against the back of the truck seat.

September 7, 2019 TX · Metal/Non-Metal dryer operator, kiln operator, dry plant operator, fluid operator, bed dryer operator HANDLING OF MATERIALS
US Silica Co · Contact with hot objects or substances

Two EEs were changing out the screens at Rotex 5186. In the process of removing a screen the injured EE received burns on forearms. 1st AID measures were taken by plant personnel, recommended by Axiom Medical Service. Subsequently, EE was seen by MD for follow up evaluation on 9/18/19. The MD would not allow the EE return to work on EE's next assigned work day of 9/19/19

August 5, 2019 TX · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
US Silica Co · Over-exertion (Not Elsewhere Classified)

EE claims injury occurred on 8/5/19. EE reported to Supervisor until 8/25/19. EE was taken for medical eval on 8/26/19, released to full duty. On 9/10/19 EE complained pain returning and was transported for second medical eval and was released to full duty. MRI was scheduled & was obtained on 10/10/19. 11/5/19 EE returned for further medical evaluation, assigned restrictions.

July 16, 2019 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
US Silica Co · Struck by falling object

Employee was removing the bucket pins from excavator to place the bucket on another excavator. After the pin was driven out completely the stick moved down and struck their right hand

July 9, 2019 TX · Metal/Non-Metal miner, prospector, nec DISORDERS (PHYSICAL AGENTS)
US Silica Co · Contact with heat

Miner became weak, dizzy and nauseated. Co-Worker assisted miner until local EMS was notified and responded then transported EE to local emergency room. Miner was released 1 1/2 hours after arrival with heat exhaustion as diagnosis.

April 24, 2019 TX · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
US Silica Co · Caught in, under or between a moving and a stationary object

EE placed right hand on lid of dust bin as forklift was setting down. EE sustained minor injury. EE was offered medical treatment and declined. On 4/27/19 EE requested medical treatment and was seen by MD. Treating MD could not see issue and released to full duty. On 5/2/19, MD determined diagnosis was incorrect and a fracture was diagnosed.

April 18, 2019 TX · Metal/Non-Metal electrician, lineman HANDTOOLS (NONPOWERED)
US Silica Co · Struck by... (Not Elsewhere Classified)

Electrician was using a utility knife to strip insulation from a wire to make a repair. Employee removed cut-resistant gloves prior to beginning the task. Employee cut right thumb with the utility knife, requiring seven sutures. No lost time and no restrictions.

January 23, 2019 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
US Silica Co · Over-exertion (Not Elsewhere Classified)

Employee tripped while walking to assigned work area. EE averted falling by grabbing a steel gusset with the left hand. In doing so, EE dislocated left thumb.

2018 · 4 incidents

December 17, 2018 TX · Metal/Non-Metal plumber, pipefitter, millwright HANDLING OF MATERIALS
US Silica Co · Struck against stationary object

Employee finished installing the last fastener during installation of a wire mesh conveyor guard. EE took off gloves to install the fastener. Employee stood up from kneeling beside the guard panel, EE's bare hand brushed across a spliced area of the expanded wire mesh on the guard panel. EE's right finger received two extensive lacerations which required stitches.

December 10, 2018 TX · Metal/Non-Metal electrician, lineman POWERED HAULAGE
US Silica Co · Caught in, under or between a moving and a stationary object

Employee was in a 126' boom lift attempting to relocate the boom lift unaware the basket was lodged on structure. When basket of boom lift broke free the basket jerked causing employee who was holding on to handrails of basket to smash right hand between basket rails and structure causing employee to smash/pinch right hand and 5th fingertip.

November 21, 2018 TX · Metal/Non-Metal electrician, lineman ALL OTHER OCCUPATIONAL ILLNESSES
US Silica Co · (Not Elsewhere Classified)

Employee reported employee felt something on knee 11/21. EE told co worker it might be a boil. Two days later EE sought treatment. 11/26 EE reported to work with a release and complained of worsening symptoms. EE left job site and went to the hospital where EE was admitted for cellulitis.

September 20, 2018 TX · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
US Silica Co · Fall onto or against objects

While attempting to connect an SRL to the harness, the employee lost balance and fell (same level) striking left knee on a toe board. The resulting injury was a laceration requiring 5 stitches.