Thornton Quarry
Active
Surface
Stone
Operator: Heidelberg Materials Midwest Agg, Inc.
Controller: Heidelberg Materials AG
Location: Thornton, Cook County, IL
Employees: 49
686
Violations
108
S&S Violations
84
Accidents
$215K
Penalties
Recent Violations
View all 686 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/25/2026 | 56.11001 | Non-S&S | ModNegligence | $0 |
| 02/25/2026 | 56.14100(b) | Non-S&S | ModNegligence | $0 |
| 09/17/2025 | 56.12004 | Non-S&S | LowNegligence | $288 |
| 09/10/2025 | 56.12021 | Non-S&S | LowNegligence | $504 |
| 09/09/2025 | 56.12068 | Non-S&S | LowNegligence | $504 |
| 02/11/2025 | 56.12068 | Non-S&S | LowNegligence | $818 |
| 08/01/2024 | 56.14109(a) | Non-S&S | LowNegligence | $147 |
| 08/01/2024 | 56.4102 | Non-S&S | ModNegligence | $221 |
| 07/31/2024 | 56.4102 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.12004 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.15014 | S&S | ModNegligence | $1,637 |
| 07/31/2024 | 56.12028 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 07/31/2024 | 56.14100(b) | Non-S&S | LowNegligence | $147 |
| 07/31/2024 | 56.12028 | Non-S&S | ModNegligence | $147 |
| 07/31/2024 | 56.16001 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.12028 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.12028 | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.4104(a) | Non-S&S | ModNegligence | $328 |
| 07/31/2024 | 56.14100(c) | S&S | ModNegligence | $1,637 |
Accidents & Injuries
View all 84 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 01/24/2026 | OTHER | INJURIES INVOLVNG NONEMPLOYEES | None |
| 11/22/2025 | SLIP OR FALL OF PERSON | INJURIES INVOLVNG NONEMPLOYEES | None |
| 04/05/2025 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | None |
| 12/09/2024 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 15d restricted |
| 01/08/2024 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 367d lost |
| 01/05/2024 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 368d lost |
| 10/15/2022 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 07/12/2021 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 06/30/2021 | NONPOWERED HAULAGE | DYS AWY FRM WRK & RESTRCTD ACT | 35d lost, 29d restricted |
| 04/24/2021 | FIRE | ACCIDENT ONLY | None |
Inspections
View all 110 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/24/2026 | 03/03/2026 | 30.00 | 1 |
| 01/28/2026 | 02/10/2026 | 10.00 | 1 |
| 11/24/2025 | 12/01/2025 | 24.00 | 1 |
| 09/08/2025 | 09/17/2025 | 110.75 | 2 |
| 02/11/2025 | 02/13/2025 | 39.50 | 1 |
| 08/19/2024 | 08/19/2024 | 4.75 | 1 |
| 07/29/2024 | 08/02/2024 | 147.50 | 3 |
| 03/12/2024 | 03/12/2024 | 2.50 | 1 |
| 03/11/2024 | 03/12/2024 | 10.75 | 1 |
| 12/18/2023 | 12/29/2023 | 69.50 | 1 |
Mine Details
MSHA Mine ID1100066
Mine TypeSurface
StatusActive
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees49
Days/Week6.0
Hours/Shift8.0
Coordinates41.5658330, -87.6136110
Nearest TownThornton
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Frequently Asked Questions
How many MSHA violations does Thornton Quarry have?
Thornton Quarry has 686 MSHA violations on record, of which 108 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $215K.
What type of mine is Thornton Quarry?
Thornton Quarry is a Surface mine producing Stone, located in Thornton, Cook County, IL. It currently has 49 employees.
Has anyone been injured or killed at Thornton Quarry?
According to MSHA records, Thornton Quarry has 84 reported accident/injury records and 0 fatalities on file.
Who operates Thornton Quarry?
Thornton Quarry is operated by Heidelberg Materials Midwest Agg, Inc. and controlled by Heidelberg Materials AG. MSHA Mine ID: 1100066.