Key Takeaway

Diablo Plant # 136 is a active surface mine producing SandAndGravel, located in Coolidge, Pinal County, AZ. It has 50 violations on record (10 S&S) and $11K in proposed penalties. Operated by CalPortland Company.

Diablo Plant # 136

Active Surface SandAndGravel

Operator: CalPortland Company

Controller: Taiheiyo Cement Corp

Location: Coolidge, Pinal County, AZ

Employees: 8

50
Violations
10
S&S Violations
3
Accidents
$11K
Penalties

Recent Violations

View all 50 →
Date Section S&S Negligence Penalty
09/17/2025 56.12004 Non-S&S ModNegligence $151
04/06/2023 56.14105 S&S ModNegligence $318
11/02/2022 56.14100 Non-S&S LowNegligence $133
11/02/2022 56.14107 Non-S&S ModNegligence $133
11/02/2022 56.20003(a) Non-S&S ModNegligence $133
11/02/2022 56.14107(a) Non-S&S ModNegligence $133
03/29/2022 56.14112(b) S&S LowNegligence $273
07/21/2021 56.18002(a) Non-S&S ModNegligence $125
07/21/2021 56.14112(b) Non-S&S ModNegligence $125
07/20/2021 56.11012 Non-S&S ModNegligence $125
10/07/2020 56.15001 Non-S&S HighNegligence $123
10/07/2020 56.14101(a)(3) Non-S&S ModNegligence $123
10/07/2020 56.4201(a)(1) Non-S&S ModNegligence $123
10/07/2020 56.14130(h) Non-S&S ModNegligence $123
10/17/2019 56.12004 Non-S&S ModNegligence $121
10/17/2019 56.12004 Non-S&S ModNegligence $121
10/17/2019 56.12025 Non-S&S ModNegligence $121
10/16/2019 56.14107(a) Non-S&S ModNegligence $121
10/30/2018 56.14100(c) Non-S&S ModNegligence $118
10/30/2018 56.12004 Non-S&S ModNegligence $336

Accidents & Injuries

View all 3 →
Date Classification Injury Days Lost
04/07/2017 HANDLING OF MATERIALS DAYS AWAY FROM WORK ONLY 32d lost
11/18/2016 HANDLING OF MATERIALS NO DYS AWY FRM WRK,NO RSTR ACT None
07/23/2015 SLIP OR FALL OF PERSON NO DYS AWY FRM WRK,NO RSTR ACT None

Inspections

View all 29 →
Begin End Hours Inspectors
09/17/2025 09/17/2025 20.25 1
03/11/2025 03/13/2025 10.00 1
09/24/2024 09/25/2024 13.00 1
06/24/2024 06/24/2024 7.25 1
10/16/2023 10/19/2023 8.75 1
04/06/2023 04/11/2023 18.00 1
11/22/2022 11/22/2022 4.50 1
11/01/2022 11/02/2022 11.75 1
09/27/2022 09/27/2022 13.50 1
06/28/2022 06/29/2022 8.25 1

Mine Details

MSHA Mine ID0203350
Mine TypeSurface
StatusActive
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees8
Days/Week5.0
Hours/Shift11.0
Coordinates33.0222220, -111.5427780
Nearest TownCoolidge

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Frequently Asked Questions

How many MSHA violations does Diablo Plant # 136 have?

Diablo Plant # 136 has 50 MSHA violations on record, of which 10 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $11K.

What type of mine is Diablo Plant # 136?

Diablo Plant # 136 is a Surface mine producing SandAndGravel, located in Coolidge, Pinal County, AZ. It currently has 8 employees.

Has anyone been injured or killed at Diablo Plant # 136?

According to MSHA records, Diablo Plant # 136 has 3 reported accident/injury records and 0 fatalities on file.

Who operates Diablo Plant # 136?

Diablo Plant # 136 is operated by CalPortland Company and controlled by Taiheiyo Cement Corp. MSHA Mine ID: 0203350.