Mining Incidents

Arizona MaterialsOperator

Controlled by Summit Materials LLC
MSHA Operator ID: L01838
Fatalities
1
Total incidents
64
Mines on record
23
Years on record
2002–2026

Safety benchmark

Recorded fatalities relative to other operators with a fatal MSHA history. Percentile is computed across the 739 operators with at least one recorded fatality.

Fatality-count percentile
0th

More recorded fatalities than 0% of operators on file.

Rank
#284of 739

Position when operators are sorted by recorded fatalities.

Vs industry mean
0.6×

Industry mean: 1.6 fatalities per fatal-history operator.

This operator
1
Industry mean
1.6
Industry median
1
Peers at similar incident volume

Methodology: percentile and rank computed across MSHA operators with at least one recorded fatality. Industry mean is the average across that same population. Peers are sampled by closest total-incident count, regardless of fatality outcome.

For counsel + compliance teams

Get an email the moment a new MSHA-reportable accident lands at any mine on file under Arizona Materials. Useful for 105(c) defense intake, FMSHRC docket prep, and active client monitoring.

Top causes

  • SLIP OR FALL OF PERSON1 fatality · 13 non-fatal
  • HANDTOOLS (NONPOWERED)17 non-fatal
  • HANDLING OF MATERIALS17 non-fatal
  • MACHINERY8 non-fatal
  • POWERED HAULAGE4 non-fatal
  • INUNDATION1 non-fatal

Incident timeline

2026
7
2025
4
2024
8
2023
6
2022
4
2021
4 (1f)
2020
3
2019
1
2018
3
2017
2
2016
6
2015
3
2013
3
2012
2
2011
3
2005
2
2004
1
2002
2

Mines on record

Fatalities under this operator

1 recorded
Fall from headframe, derrick or tower

The employee was last seen on top of the tower and determined to be missing. The employee was found in a pipe traveling from the cyclone discharge box to the thickener tank. Investigation has revealed that the employee traveled outside the provided safe access to the cyclone discharge box. It is not yet determined how the employee entered the pipe.