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: 402 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 has $18K in proposed MSHA penalties and $151 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.
$18K
proposed penalties
$18K
current assessed
$18K
paid to date
$151
outstanding
37 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-08-28.
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.
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: 2025-02-11
0%
of limit-tested samples over the exposure limit
8
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg6
Quartz, respirable, >1% Qtz2
Show the individual readings (8)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-02-11
Respirable dust, <.1mg
0
Crusher Oper/Worker
2025-02-11
Quartz, respirable, >1% Qtz
0.26
1.39
0.19
Washer Operator
2023-11-27
Respirable dust, <.1mg
0
Laborer, Bullgang
2023-11-27
Respirable dust, <.1mg
0
Crusher Oper/Worker
2020-09-09
Respirable dust, <.1mg
0
Laborer, Bullgang
2020-09-09
Quartz, respirable, >1% Qtz
0.14
Crusher Oper/Worker
2020-09-09
Respirable dust, <.1mg
0
Truck Driver
2020-09-09
Respirable dust, <.1mg
0
Crusher Oper/Worker
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 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 Arizona, metal and nonmetal mining averaged 1.81 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
2025 *
0.00
0.00
0.000
2024 *
3.76
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
14.33
4.78
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
22
2025
24
2024
23
2023
25
2022
26
2021
21
2020
18
2019
11
Source: MSHA quarterly employment and production, updated weekly.
Plant 1 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
17,746
0
0
0.0
2026 Q1
12,649
0
0
0.0
2025 Q4
15,567
0
0
0.0
2025 Q3
12,936
2
1
154.6
2025 Q2
15,536
0
0
0.0
2025 Q1
12,763
1
0
78.4
2024 Q4
14,620
0
0
0.0
2024 Q3
12,019
1
0
83.2
Show 20 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
14,370
0
0
0.0
2024 Q1
12,238
0
0
0.0
2023 Q4
12,157
0
0
0.0
2023 Q3
11,566
4
0
345.8
2023 Q2
13,810
0
0
0.0
2023 Q1
13,852
2
0
144.4
2022 Q4
19,179
0
0
0.0
2022 Q3
28,590
6
2
209.9
2022 Q2
10,320
0
0
0.0
2022 Q1
14,571
7
0
480.4
2021 Q4
16,891
0
0
0.0
2021 Q3
13,332
0
0
0.0
2021 Q2
11,019
0
0
0.0
2021 Q1
11,449
3
0
262.0
2020 Q4
12,724
0
0
0.0
2020 Q3
12,295
10
3
813.3
2020 Q2
9,484
3
1
316.3
2020 Q1
7,364
0
0
0.0
2019 Q4
4,362
0
0
0.0
2019 Q3
4,010
0
0
0.0
Fatalities at this mine
1 recorded
June 1, 2020AZ · Metal/Non-Metalhaul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driverFatality · SLIP OR FALL OF PERSON
Upon information provided injury occurred while tarping load. EE fell from trailer to the ground.
Reportable incidents
4 on file (excluding fatalities above)
2024 · 1 incident
May 13, 2024AZ · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSTEPPING OR KNEELING ON OBJECT
Finishing maintenance on wash plant screen deck, stepped down off screen motor onto round handle of spray bar cleaning tool. Handle rolled causing slip and twist of ankle.
2020 · 3 incidents
July 10, 2020AZ · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerMACHINERY
Employee was torching a part on the cone crusher when a piece of debris got into EE's eye. Employee was following company policy and wearing safety glasses. Employee reported the injury the following day 7/11/2020 and was sent for medical review on 7/13/2020 to evaluate.
April 29, 2020AZ · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerPOWERED HAULAGE
Employee was setting concrete blocks on stem wall. Reported that shoulder was sore. Rested it for a couple days with minimal exertion and was then sent to the company doctor.