Mining Incidents

Arizona Materials operator

Controlled by Summit Materials LLC
MSHA operator ID: L01838

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Fatalities
1
Total incidents
64
Mines on record
23
Years on record
2002–2026
Compliance record
MSHA citations since 2000
1,122
citations
258
significant & substantial
$521,849
proposed penalties
$472,739
paid to date
Source: MSHA violations data, updated weekly.

Top causes

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
February 25, 2021 NV · Metal/Non-Metal hydrate plant operator Fatality · SLIP OR FALL OF PERSON
Sierra Ready Mix · 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.