Mining Incidents

Alpine Silica-Monahans: 163 MSHA citations Metal/Non-Metal

Alpine Silica LLC · Surface
Controlled by Pro Frac Holding Corp
Monahans, Ector County, TX  ·  Active
MSHA Mine ID: 4105320

Alpine Silica-Monahans has $45K in proposed MSHA penalties and $266 outstanding across 2 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
22
Years on record
2018–2024
Latest incident
Jul 2024
Compliance record
MSHA citations since 2018
163
citations
34
significant & substantial
$45,330
proposed penalties
$44,764
paid to date
99% of proposed penalties paid to date, a $566 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2018
32
inspections on record
885
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: 885 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Alpine Silica-Monahans has $45K in proposed MSHA penalties and $266 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.
$45K
proposed penalties
$45K
current assessed
$45K
paid to date
$266
outstanding
148 assessments are final orders; 2 contested dockets.
Of $2K in penalties contested before the Commission, $1K was upheld in final decisions.
As of the most recent assessment on 2026-03-05.
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.
20.9%
significant & substantial
1.8%
high negligence or reckless
20.9%
reasonably likely or greater
33.1%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 6.7% low, 91.4% moderate, 1.8% 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 · 2% of citations on record
  • Settled 1 · 33%
  • Stood as issued 2 · 67%
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%
18%
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 2019-05-08.
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 2019-0218 Default McCarthy 2019 $1K → $1K
CENT 2019-0002 Settlement Miller 2019 $429 → $129
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: 2018-09-19, 7 years ago
3
samples
0
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz2
  • Respirable dust, <.1mg1
Show the individual readings (3)
Date Contaminant Concentration Limit Conc / limit Occupation
2018-09-19 Quartz, respirable, >1% Qtz 0.14 Dry Screen Plant Operator
2018-09-19 Respirable dust, <.1mg 0 Sand Filler (Dry)
2018-09-19 Quartz, respirable, >1% Qtz 0.13 Sand Filler (Dry)
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.

Alpine Silica-Monahans 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 Texas, metal and nonmetal mining averaged 1.17 cases per 100 workers that year.
Year total case rate days-away fatal
2025 0.00 0.00 0.000
2024 2.75 0.00 0.000
2023 1.39 0.00 0.000
2022 3.30 1.10 0.000
2021 * 2.02 0.00 0.000
2020 * 0.00 0.00 0.000
2019 4.26 0.00 0.000
2018 3.88 2.22 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. Alpine Monahans, LLC 2018 to 2024
  2. Alpine Silica LLC 2024 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 45
2025 63
2024 65
2023 68
2022 72
2021 37
2020 31
2019 121
2018 144
Source: MSHA quarterly employment and production, updated weekly.

Alpine Silica-Monahans sits in Ector County, Texas, where the Census mining category is 13.3% 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.
Ector County, Texas · Population 163,206
13.3%
Mining share of county employment
$71,031
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 23,243 0 0 0.0
2026 Q1 32,820 5 1 152.3
2025 Q4 31,587 0 0 0.0
2025 Q3 24,115 3 0 124.4
2025 Q2 40,824 0 0 0.0
2025 Q1 38,931 2 0 51.4
2024 Q4 38,856 2 2 51.5
2024 Q3 33,622 0 0 0.0
Show 26 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 41,073 12 0 292.2
2024 Q1 31,659 0 0 0.0
2023 Q4 25,047 7 3 279.5
2023 Q3 35,116 3 1 85.4
2023 Q2 37,129 0 0 0.0
2023 Q1 46,957 0 0 0.0
2022 Q4 49,690 5 1 100.6
2022 Q3 47,580 7 0 147.1
2022 Q2 46,369 19 5 409.8
2022 Q1 37,979 0 0 0.0
2021 Q4 34,130 0 0 0.0
2021 Q3 30,176 9 2 298.3
2021 Q2 25,239 0 0 0.0
2021 Q1 9,673 3 1 310.1
2020 Q4 4,003 0 0 0.0
2020 Q3 5,223 5 0 957.3
2020 Q2 18,466 0 0 0.0
2020 Q1 39,770 4 0 100.6
2019 Q4 50,039 0 0 0.0
2019 Q3 68,085 16 2 235.0
2019 Q2 81,754 2 0 24.5
2019 Q1 81,980 19 5 231.8
2018 Q4 83,494 0 0 0.0
2018 Q3 111,085 17 7 153.0
2018 Q2 104,839 0 0 0.0
2018 Q1 61,701 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

22 on file

2024 · 2 incidents

July 29, 2024 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech DISORDERS (PHYSICAL AGENTS)
Alpine Silica LLC · Contact with heat

Employee was adjusting the trunnion bearings of the dryer drum. Employee in 102° weather started to feel hot/ill, notified supervisor. EE was then taken to a break room. First aid administered. Symptoms worsened, decided to take employee to the hospital. When employee was stood up, EE lost consciousness but regained it a moment later. Taken by ambulance for medical treatment.

February 29, 2024 TX · Metal/Non-Metal utility man, shift tech, service/dump truck operator HANDLING OF MATERIALS
Alpine Silica LLC · Struck against stationary object

Employee was in the control room preparing for shift change. Employee then noticed co-worker had a knife on the table and asked if EE could look at it. Co-worker handed the knife to the employee. EE ended up grabbing it wrongly by the blade, cutting self in the process. Laceration required 6 sutures to close the wound. Employee returned to duty after medical treatment.

2023 · 1 incident

August 5, 2023 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Alpine Monahans, LLC · Struck by flying object

Employee suffered foreign body in their eye when turning on a shop fan. The fan stirred up dust in the shop. Employee was wearing safety glasses. First aid was administered(eye wash) but EE still felt something in the eye and requested medical attention. Employee was given prescription eye drops and returned to work.

2022 · 3 incidents

May 23, 2022 TX · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall to the walkway or working surface

An employee was walking in the chemical room to turn off a water hose being used to fill a tank when the employee slipped and fell on the concrete floor injuring back. The employee was diagnosed with nondisplaced left transverse process fractures at L3 and L4 vertebrae.

May 23, 2022 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Alpine Monahans, LLC · Struck by flying object

On 5/23/22 a maintenance employee was greasing trunnions on a sand dryer when EE felt something in EE's right eye. On 5/25/22 the eye continued to feel irritated, so EE sought medical treatment and a small piece of metal was removed from EE's eye.

April 6, 2022 TX · Metal/Non-Metal miner, prospector, nec HANDTOOLS (NONPOWERED)
Alpine Monahans, LLC · Struck by... (Not Elsewhere Classified)

An employee was trimming a dewatering screen panel with a razor knife when EE cut the tip of right index finger causing a laceration that required 5 sutures to repair.

2021 · 1 incident

October 26, 2021 TX · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Over-exertion (Not Elsewhere Classified)

Injured employee was pulling a water hose while cleaning up an area at the wet plant. While walking EE stepped on a sand pile causing EE to trip injuring EE's right knee and back. Employee was diagnosed with a sprained right knee and back and was given work restrictions.

2019 · 7 incidents

October 27, 2019 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall from machine

A heavy equipment operator was dismounting an excavator at the end of the shift. The bottom access step was covered in mud and caused the employee to slip and land awkwardly injuring left knee. On 11/5/2019 the employee was diagnosed with a sprained MCL and placed on restricted duty as a result of the original injury.

October 14, 2019 TX · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant HANDLING OF MATERIALS
Alpine Monahans, LLC · Over-exertion (Not Elsewhere Classified)

EE was walking across even ground and went to step up onto the truck scale (approx 12-18"). As EE began to lift self onto the platform, EE felt a pop in EE's left knee. Employee was seen by medical personnel the following day and was diagnosed with an unknown internal derangement of the left knee and placed on restriction.

July 3, 2019 TX · Metal/Non-Metal miner, prospector, nec HANDLING OF MATERIALS
Alpine Monahans, LLC · Struck by falling object

Employee was taking off a hatch from a Bucket Elevator, when EE accidentally dropped it on EE's Right Foot. Initially it was diagnosed as a contusion type injury. Upon follow up evaluation, the Physician diagnosed it as a fracture of the 5th digit little toe. This diagnosis was made on 7/10/2019.

June 3, 2019 TX · Metal/Non-Metal utility man, shift tech, service/dump truck operator SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall to the walkway or working surface

Employee slipped on some sand, straining back and right hand. The Employee was medically evaluated by a physician, X-Rays proved negative findings, and the Employee was prescribed muscle relaxants.

May 18, 2019 TX · Metal/Non-Metal electrician, lineman HANDLING OF MATERIALS
Alpine Monahans, LLC · Struck by falling object

Employee was replacing a blower on line A when EE was struck on the head with an 18" aluminum pipe wrench that had been dropped from an upper level of approximately 35'- 40'

April 18, 2019 TX · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech EXPLODING VESSELS UNDER PRESSURE
Alpine Monahans, LLC · Struck by flying object

Contractor (MSHA ID: B9304) was in the process of changing out a valve and mufflers due to sand build-up. EE was in the process of unscrewing the valve from the air supply line when pressure in the valve propelled it striking the contractor on the left side of EE's face directly in the brow line causing an approximate 1.5" laceration.

April 10, 2019 TX · Metal/Non-Metal miner, prospector, nec DISORDERS (REPEATED TRAUMA)
Alpine Monahans, LLC · Over-exertion (Not Elsewhere Classified)

On 4/10 EE reported pain in right wrist. On 4/12 EE diagnosed with repetitive use disorder. On or about 7/14/19 disorder determined to be work related. Surgery on 7/26/19.

2018 · 8 incidents

December 9, 2018 TX · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant OTHER
Alpine Monahans, LLC · Bodily reaction, (Not Elsewhere Classified)

Employee was walking on regular QC Route and complained foot was hurting.

July 12, 2018 TX · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall to the walkway or working surface

Employee was walking to raw feed area to collect a sample for quality control. While walking, employee tripped in mud and fell down. First aid was performed. Employee went to an occupational clinic on July 16, 2018, where employee was treated for a sprained right knee.

July 11, 2018 TX · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall to the walkway or working surface

Plant operator stepped onto grating. The grating shifted, causing the operator to trip and fall. First aid was provided. Employee went to an occupational clinic on July 18, 2018, where ee was treated for a sprained right knee.

June 16, 2018 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Alpine Monahans, LLC · Absorption of radiations, caustics, toxic and noxious substances

Diesel Exhaust Fluid splashed into miner's eye when removing the fueling nozzle. A medical review was performed on 8/22/18 that diagnosed the miner with chemical conjunctivitis and traumatic cataract of the left eye.

April 16, 2018 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Alpine Monahans, LLC · Struck against a moving object

Dozer operator felt pain in EE's shoulder after driving EE's dozer into excavation.

April 3, 2018 TX · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall down stairs

Employee was walking down stairs when EE missed the last step and fell.

March 28, 2018 TX · Metal/Non-Metal welder (non-shop) HANDTOOLS (NONPOWERED)
Alpine Monahans, LLC · Struck by... (Not Elsewhere Classified)

Employee was using a 4 lb hammer and hammer wrench to loosen bolts on a Rotex. While swinging the hammer it hit a junction box in close proximity and caused the hammer to impact their ring finger on the left hand. Impact caused open fracture with blow out laceration at the tip of the finger.

March 7, 2018 TX · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Alpine Monahans, LLC · Fall to the walkway or working surface

Employee was leaving flocculant building when employee slipped.