Mining Incidents

Twin Peaks Aggregate Metal/Non-Metal

CalPortland Company · Surface
Controlled by Taiheiyo Cement Corp
Mesa, Pima County, AZ  ·  Active
MSHA Mine ID: 0202283

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Fatalities
0
Total incidents
5
Years on record
2006–2021
Latest incident
Oct 2021
Compliance record
MSHA citations since 2000
52
citations
11
significant & substantial
$7,391
proposed penalties
$6,885
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2025 Q4 4,282 0 0 0.0
2025 Q1 4,161 1 0 240.3
2024 Q3 4,766 0 0 0.0
2024 Q1 398 0 0 0.0
2023 Q4 4,662 0 0 0.0
2023 Q2 4,614 0 0 0.0
2023 Q1 482 0 0 0.0
2022 Q4 3,065 0 0 0.0
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

5 on file

2021 · 1 incident

October 8, 2021 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
CalPortland Company · Over-exertion in pulling or pushing objects

While moving a portable staircase, the employee felt a pain in EE's groin while pulling on staircase.

2020 · 1 incident

November 21, 2020 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech STRIKING OR BUMPING
CalPortland Company · Struck against stationary object

The IW was standing up from retrieving a tool when EE turned around and hit EE's face on an I- beam. The IW suffered a broken nose and a chipped tooth.

2018 · 2 incidents

December 13, 2018 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
CalPortland Company · Fall to the walkway or working surface

EE was tasked with removing a jammed rock from the jaw portion of a jaw crusher. EE was using a digging bar to accomplish this task. While prying on the bar, EE slipped and fell back onto the same level catwalk.

June 5, 2018 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
CalPortland Company · Caught in, under or between a moving and a stationary object

EE had stopped truck, set brakes and exited truck to talk to another ee. EE was standing on other ee steps when other ee truck started to roll backward, which pinned ee between the door of ee truck and other ee mirror. ee received bruising. Trucks were not damaged.

2006 · 1 incident

January 4, 2006 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
CalPortland Company · Fall from machine

Employee on top step/deck of loader, opening the cab door, feet slipped and fell off of loader. Transported to hospital and diagnosed with compression fracture lower back. Off work status.