Data / Mines / Illinois / Thornton Quarry
Thornton Quarry, Cook County, Illinois: 92 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Thornton Quarry is an active crushed, broken limestone surface mine in Cook County, Illinois, operated by Heidelberg Materials Midwest Agg, Inc. with 75 employees on MSHA's record (mine ID 1100066). Since January 1, 2022 MSHA inspectors issued 92 citations and orders there with $46,608 in proposed penalties, and 8 accident reports were filed there, with 6 injury or illness cases.
The request: Watch Thornton Quarry (MSHA mine ID 1100066) in Cook County, Illinois: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 1100066
- Status
- Active since June 25, 2013
- Main commodity
- Crushed, broken limestone
- Mine type
- Surface
- County
- Cook County, Illinois
- Nearest town
- Thornton
- Operator
- Heidelberg Materials Midwest Agg, Inc.
- Parent company
- Heidelberg Materials AG
- Employees
- 75
- MSHA field office
- Peru IL Field Office
- Citations and orders since January 1, 2022
- 92
- Significant and substantial
- 18 (19.6%)
- Closure orders
- 0
- High negligence or reckless
- 1
- Proposed penalties
- $46,608
- Amount paid so far
- $46,608
- Inspections
- 20
- Inspector hours on site
- 546
- Citations per inspection
- 4.60 (all mines 2.30)
- Accident reports
- 8
- Injury and illness cases
- 6
- Fatalities
- 0
- Latest MSHA record
- September 9, 2026
- Citations issued to contractors here
- 16 ($2,320 proposed)
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 4 | 1 | $1,187 | 1 |
| 2023 | 42 | 8 | $12,885 | 0 |
| 2024 | 38 | 9 | $29,818 | 3 |
| 2025 | 4 | 0 | $2,114 | 1 |
| 2026 | 4 | 0 | $604 | 1 |
Standards cited most at Thornton Quarry
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.4102 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.4104 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.16006 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12068 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 2 |
Injury and illness cases at Thornton Quarry
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 5 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Thornton Quarry describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 5 |
| Slip or fall of person | 2 |
| Other | 1 |
Equipment named in accident reports at Thornton Quarry
| Equipment | Reports |
|---|---|
| Forklift | 1 |
| Front-end loader | 1 |
Other open mines in Cook County, Illinois
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Federal Underground | Heidelberg Materials Midwest Agg, Inc. | Cook County, IL | Crushed, broken limestone | 3 | 106 |
| Bartlett Underground Quarry | Vulcan Construction Materials, LLC | Cook County, IL | Crushed, broken limestone | 5 | 64 |
| McCook Quarry | Vulcan Construction Materials, LLC | Cook County, IL | Crushed, broken limestone | 94 | 42 |
| Bartlett Yard | Earth Inc. | Cook County, IL | Construction sand and gravel | 2 | 8 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.