Key Takeaway

Twin Peaks Aggregate is a active surface mine producing SandAndGravel, located in Mesa, Pima County, AZ. It has 52 violations on record (11 S&S) and $7K in proposed penalties. Operated by CalPortland Company.

Twin Peaks Aggregate

Active Surface SandAndGravel

Operator: CalPortland Company

Controller: Taiheiyo Cement Corp

Location: Mesa, Pima County, AZ

Employees: 6

52
Violations
11
S&S Violations
5
Accidents
$7K
Penalties

Recent Violations

View all 52 →
Date Section S&S Negligence Penalty
03/19/2025 56.11003 Non-S&S ModNegligence $151
10/16/2024 57.14100(c) Non-S&S HighNegligence $147
10/16/2024 57.14100(c) Non-S&S HighNegligence $147
10/16/2024 56.20003(a) Non-S&S ModNegligence $147
10/16/2024 47.41(a)(1) Non-S&S ModNegligence $147
10/16/2024 56.14107(a) Non-S&S HighNegligence $147
10/16/2024 56.14110 Non-S&S ModNegligence $147
12/28/2020 56.14101(a)(3) Non-S&S ModNegligence $125
05/27/2020 56.12004 Non-S&S ModNegligence $123
12/27/2018 56.14101(a)(3) Non-S&S ModNegligence $121
12/27/2018 56.14100(c) S&S ModNegligence $168
12/27/2018 46.7(a) S&S ModNegligence $187
06/20/2018 56.12002 Non-S&S ModNegligence $118
04/26/2017 56.14107(a) Non-S&S ModNegligence $116
04/26/2017 56.4201(a)(1) Non-S&S ModNegligence $116
04/26/2017 56.14100(b) Non-S&S ModNegligence $116
04/26/2017 56.11001 Non-S&S ModNegligence $116
04/26/2017 56.14101(a)(2) S&S ModNegligence $492
12/06/2016 56.11001 Non-S&S ModNegligence $114
12/06/2016 56.14112(b) Non-S&S ModNegligence $114

Accidents & Injuries

View all 5 →
Date Classification Injury Days Lost
10/08/2021 HANDLING OF MATERIALS DAYS AWAY FROM WORK ONLY 56d lost
11/21/2020 STRIKING OR BUMPING NO DYS AWY FRM WRK,NO RSTR ACT None
12/13/2018 HANDTOOLS (NONPOWERED) DAYS RESTRICTED ACTIVITY ONLY 14d restricted
06/05/2018 POWERED HAULAGE DAYS AWAY FROM WORK ONLY 3d lost
01/04/2006 SLIP OR FALL OF PERSON DYS AWY FRM WRK & RESTRCTD ACT 80d lost, 27d restricted

Inspections

View all 63 →
Begin End Hours Inspectors
02/10/2026 02/10/2026 6.00 1
03/19/2025 03/19/2025 10.00 1
10/16/2024 10/17/2024 15.25 1
09/17/2024 09/17/2024 14.00 1
07/01/2024 07/03/2024 7.00 1
12/20/2023 12/26/2023 8.00 1
06/26/2023 06/30/2023 10.50 1
01/17/2023 01/18/2023 5.25 1
05/05/2022 05/05/2022 9.50 1
01/27/2022 01/27/2022 16.00 1

Mine Details

MSHA Mine ID0202283
Mine TypeSurface
StatusActive
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees6
Days/Week5.0
Hours/Shift12.0
Coordinates32.3533330, -111.1830560
Nearest TownMesa

Frequently Asked Questions

How many MSHA violations does Twin Peaks Aggregate have?

Twin Peaks Aggregate has 52 MSHA violations on record, of which 11 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $7K.

What type of mine is Twin Peaks Aggregate?

Twin Peaks Aggregate is a Surface mine producing SandAndGravel, located in Mesa, Pima County, AZ. It currently has 6 employees.

Has anyone been injured or killed at Twin Peaks Aggregate?

According to MSHA records, Twin Peaks Aggregate has 5 reported accident/injury records and 0 fatalities on file.

Who operates Twin Peaks Aggregate?

Twin Peaks Aggregate is operated by CalPortland Company and controlled by Taiheiyo Cement Corp. MSHA Mine ID: 0202283.