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
Operator: CalPortland Company
Controller: Taiheiyo Cement Corp
Location: Mesa, Pima County, AZ
Employees: 6
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
Related Mines
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.