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Plant 1 Avondale: 47 MSHA citations Metal/Non-Metal

Arizona Materials · Surface
Controlled by Summit Materials LLC
Tolleson, Maricopa County, AZ  ·  Active
MSHA Mine ID: 0203390

Plant 1 Avondale has $9K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
1
Years on record
2026
Latest incident
Jan 2026
Compliance record
MSHA citations since 2017
47
citations
21
significant & substantial
$8,855
proposed penalties
$8,855
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
See Arizona Materials's full MSHA compliance history →
Inspection activity
MSHA inspections since 2017
23
inspections on record
256
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: 256 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Plant 1 Avondale has $9K in proposed MSHA penalties and $0 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.
$9K
proposed penalties
$9K
current assessed
$9K
paid to date
$0
outstanding
47 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2026-03-09.
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.
44.7%
significant & substantial
2.1%
high negligence or reckless
44.7%
reasonably likely or greater
36.2%
permanently disabling or fatal if injury occurs
Negligence coding: 2.1% none, 10.6% low, 85.1% moderate, 2.1% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, 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: 2024-08-06
0%
of limit-tested samples over the exposure limit
2
samples
1
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz1
  • Unlisted Particulate, respirable, <1% Qtz1
Show the individual readings (2)
Date Contaminant Concentration Limit Conc / limit Occupation
2024-08-06 Quartz, respirable, >1% Qtz 0.19 0.66 0.29 Front-end Loader Operator
2024-08-06 Unlisted Particulate, respirable, <1% Qtz 40.98 Front-end Loader Operator
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.

Plant 1 Avondale recorded 0.00 reportable injury cases per 100 full-time workers in 2023.

Injury rate, 2023
ⓘ 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
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 1.78 and the all-US-mining average was 2.10 cases per 100 workers.
In Arizona, metal and nonmetal mining averaged 2.62 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year total case rate days-away fatal
2023 * 0.00 0.00 0.000
2022 * 0.00 0.00 0.000
2021 * 0.00 0.00 0.000
2020 * 0.00 0.00 0.000
2019 * 0.00 0.00 0.000
2018 * 0.00 0.00 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. Diamondback Sand and Rock LLC 2017 to 2024
  2. Arizona Materials 2024 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 8
2025 7
2024 8
2023 12
2022 11
2021 15
2020 16
2019 17
2018 20
2017 14
Source: MSHA quarterly employment and production, updated weekly.

Plant 1 Avondale sits in Maricopa County, Arizona, where the Census mining category is 0.2% 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.
Maricopa County, Arizona · Population 4,491,987
0.2%
Mining share of county employment
$85,518
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 5,149 0 0 0.0
2026 Q1 4,802 13 2 2707.2
2025 Q4 4,580 0 0 0.0
2025 Q3 3,906 0 0 0.0
2025 Q2 5,142 0 0 0.0
2025 Q1 5,396 0 0 0.0
2024 Q4 4,890 1 0 204.5
2024 Q3 5,187 1 0 192.8
Show 27 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 6,434 0 0 0.0
2024 Q1 1,756 0 0 0.0
2023 Q4 8,585 0 0 0.0
2023 Q3 8,231 0 0 0.0
2023 Q2 7,714 0 0 0.0
2023 Q1 6,959 2 0 287.4
2022 Q4 6,829 0 0 0.0
2022 Q3 6,897 1 0 145.0
2022 Q2 5,998 0 0 0.0
2022 Q1 4,528 0 0 0.0
2021 Q4 9,049 0 0 0.0
2021 Q3 7,254 13 11 1792.1
2021 Q2 6,437 0 0 0.0
2021 Q1 6,523 0 0 0.0
2020 Q4 7,430 0 0 0.0
2020 Q3 7,417 4 1 539.3
2020 Q2 7,570 0 0 0.0
2020 Q1 6,545 0 0 0.0
2019 Q4 6,677 0 0 0.0
2019 Q3 8,086 0 0 0.0
2019 Q2 11,502 6 3 521.6
2019 Q1 8,894 0 0 0.0
2018 Q4 9,032 0 0 0.0
2018 Q3 9,720 0 0 0.0
2018 Q2 8,308 0 0 0.0
2018 Q1 5,460 0 0 0.0
2017 Q4 3,863 6 4 1553.2
No fatalities recorded at this mine.

Reportable incidents

1 on file

2026 · 1 incident

January 9, 2026 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer POWERED HAULAGE
Arizona Materials · Over-exertion (Not Elsewhere Classified)

While employee was cleaning under the wash plant with a mini skid steer EE backed into the H beam which forced EE's arm and wrist into the boom lift lever which injured the employees wrist.