Mining Incidents

Cobey Hollow Stone- Mico Metal/Non-Metal

Ace Aggregates, LLC · Surface
Mico, Medina County, TX  ·  Active
MSHA Mine ID: 4105287

Cobey Hollow Stone- Mico has $42K in proposed MSHA penalties and $465 outstanding across 0 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
8
Years on record
2017–2026
Latest incident
Apr 2026
Compliance record
MSHA citations since 2017
75
citations
18
significant & substantial
$42,470
proposed penalties
$42,005
paid to date
99% of proposed penalties paid to date, a $465 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2017
30
inspections on record
370
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: 370 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Cobey Hollow Stone- Mico has $42K in proposed MSHA penalties and $465 outstanding across 0 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.
$42K
proposed penalties
$42K
current assessed
$42K
paid to date
$465
outstanding
74 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-03-03.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
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 Q4 16,291 0 0 0.0
2025 Q3 17,346 0 0 0.0
2025 Q2 17,897 1 0 55.9
2025 Q1 17,004 2 2 117.6
2024 Q4 14,560 12 2 824.2
2024 Q3 14,211 6 1 422.2
2024 Q2 14,351 0 0 0.0
2024 Q1 7,864 19 3 2416.1
Show 26 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 7,857 0 0 0.0
2023 Q3 8,756 0 0 0.0
2023 Q2 9,779 3 2 306.8
2023 Q1 8,573 0 0 0.0
2022 Q4 8,946 3 0 335.3
2022 Q3 8,415 7 5 831.8
2022 Q2 7,596 0 0 0.0
2022 Q1 6,301 5 0 793.5
2021 Q4 7,756 0 0 0.0
2021 Q3 6,889 0 0 0.0
2021 Q2 6,490 0 0 0.0
2021 Q1 6,035 0 0 0.0
2020 Q4 6,662 1 0 150.1
2020 Q3 6,158 0 0 0.0
2020 Q2 4,694 2 0 426.1
2020 Q1 5,952 3 2 504.0
2019 Q4 4,271 0 0 0.0
2019 Q3 5,046 4 1 792.7
2019 Q2 6,020 0 0 0.0
2019 Q1 5,472 1 0 182.7
2018 Q4 4,335 0 0 0.0
2018 Q3 4,718 0 0 0.0
2018 Q2 4,582 2 0 436.5
2018 Q1 5,028 0 0 0.0
2017 Q4 4,413 2 0 453.2
2017 Q3 3,446 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

8 on file

2026 · 1 incident

April 13, 2026 TX · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Ace Aggregates, LLC · Over-exertion (Not Elsewhere Classified)

Employee reported having back pain to EE's supervisor. EE was about to grease EE's loader, but hadn't started yet, when EE began to feel pain. EE does not know what caused it. EE was not doing anything when the pain started. Axis care line was called. Nurse advised rest, OTC pain meds, & Ice therapy. Employee was sent home at 12:40 to rest and follow nurses care plan.

2025 · 1 incident

January 27, 2025 TX · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver MACHINERY
Ace Aggregates, LLC · Struck against a moving object

EE texted Plant supervisor that the excavator operator was dropping large rocks too hard in EE's haul truck. EE did not report and injury at that time but after EE's shift EE called HR and said EE's back hurt. EE to Texas med clinic and the ER and was diagnosed with possible muscle and vertebrae injuries.

2024 · 1 incident

June 22, 2024 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDTOOLS (NONPOWERED)
Ace Aggregates, LLC · Fall from machine

EE was tightening a bolt on the Inertia Hawk Crusher with a wrench and ratchet. The ratchet slipped, EE lost balance and fell to the ground injuring left leg. EMS was called. EE was taken to the hospital.

2023 · 1 incident

June 1, 2023 TX · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator DISORDERS (PHYSICAL AGENTS)
Ace Aggregates, LLC · Contact with heat

EE came to the office feeling sick- dizziness and muscle spasms. EE was unable to drive home. EMS Came to check EE. EE refused the hospital so EMT suggested Urgent care. EE was seen by Urgent Care doctor and diagnosed with dehydration & low electrolytes. All tests including Covid & Flu came back negative. Doctor gave EE a steroid shot, told EE to rest & drink lots of fluids.

2022 · 1 incident

February 9, 2022 TX · Metal/Non-Metal mine manager, mine foreman, mine owner MACHINERY
Ace Aggregates, LLC · Struck by... (Not Elsewhere Classified)

Injured employee was holding angle iron while another drilled a hole in it in order to mount a sign. The drill bit pierced the metal, caught employee's glove, and caused a puncture wound in hand. Injured employee driven to the office where the hand was washed and bandages applied. Employee was taken to the emergency room where they received 8 stitches and was released to go home.

2020 · 1 incident

June 24, 2020 TX · Metal/Non-Metal rotary bucket excavator operator MACHINERY
Ace Aggregates, LLC · Struck by... (Not Elsewhere Classified)

Employee was operating 336 excavator near surge pile. Weather was clear & dry. Employee loaded rock truck with 2 buckets of material. As EE turned to get third bucket, rocks & boulders slid down and hit excavator. A boulder crashed through side window, hitting employee's shoulder and showering EE with broken glass. Employee bruised shoulder and had minor lacerations from glass.

2019 · 1 incident

October 28, 2019 TX · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Ace Aggregates, LLC · Struck by falling object

EE broke a bone in foot after a rock from the crusher fell on it. EE went to close a side door on the crusher without properly shutting it down, first. EE was told by the plant manager to shut it down first, but EE did not. The plant manager saw EE approaching the machine while still running, and pressed the e-stop, but EE had already been hit by the rock.

2017 · 1 incident

November 1, 2017 TX · Metal/Non-Metal mine manager, mine foreman, mine owner SLIP OR FALL OF PERSON
Ace Aggregates, LLC · Fall down stairs

Employee tripped and fell from the steps of their office(modular building).

For insurers, brokers, and safety consultants

The full compliance file on Cobey Hollow Stone- Mico

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.