Data / Mines / Wisconsin / Rock County
Mines in Rock County, Wisconsin: 16 open mines
MSHA lists 16 open mines in Rock County, Wisconsin, run by 8 operators and employing 49 people. Since January 1, 2022 its inspectors issued 108 citations and orders there with $19,943 in proposed penalties, and operators reported 2 injury or illness cases. The operators with the most open mines are Southern Wisconsin Aggregate Corporation; Bjoin Limestone Inc; Jaw Sand and Gravel LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 16
- Operators
- 8
- Employees
- 49
- Intermittent
- 11
- Active
- 5
- Citations and orders since January 1, 2022
- 108
- Significant and substantial
- 12 (11.1%)
- Closure orders
- 1
- High negligence or reckless
- 10
- Proposed penalties
- $19,943
- Amount paid so far
- $19,547
- Inspections
- 98
- Inspector hours on site
- 467
- Citations per inspection
- 1.10 (all mines 2.30)
- Accident reports
- 2
- Injury and illness cases
- 2
- Fatalities
- 0
- Latest MSHA record
- August 27, 2026
Operators with the most open mines in Rock County, Wisconsin
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Southern Wisconsin Aggregate Corporation | 5 | 11 | 48 | $8,895 | 0 |
| Bjoin Limestone Inc | 4 | 12 | 21 | $4,367 | 2 |
| Jaw Sand and Gravel LLC | 2 | 10 | 8 | $1,954 | 0 |
| Janesville Sand & Gravel Co. | 1 | 10 | 16 | $2,564 | 0 |
| Prairie Avenue Concrete, Inc. | 1 | 2 | 10 | $1,442 | 0 |
| Footville Rock & Lime Corp | 1 | 1 | 4 | $570 | 0 |
| Corporate Contractors, Inc | 1 | 2 | 1 | $151 | 0 |
| Little Limestone Inc | 1 | 1 | 0 | $0 | 0 |
Operators with the most citations in Rock County, Wisconsin
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Southern Wisconsin Aggregate Corporation | 5 | 11 | 48 | $8,895 | 0 |
| Bjoin Limestone Inc | 4 | 12 | 21 | $4,367 | 2 |
| Janesville Sand & Gravel Co. | 1 | 10 | 16 | $2,564 | 0 |
| Prairie Avenue Concrete, Inc. | 1 | 2 | 10 | $1,442 | 0 |
| Jaw Sand and Gravel LLC | 2 | 10 | 8 | $1,954 | 0 |
| Footville Rock & Lime Corp | 1 | 1 | 4 | $570 | 0 |
| Corporate Contractors, Inc | 1 | 2 | 1 | $151 | 0 |
| Little Limestone Inc | 1 | 1 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Nordberg | Southern Wisconsin Aggregate Corporation | Rock County, WI | Crushed, broken limestone | 4 | 25 |
| Janesville Pit and Mill | Janesville Sand & Gravel Co. | Rock County, WI | Construction sand and gravel | 10 | 16 |
| Portable Unit #2 | Bjoin Limestone Inc | Rock County, WI | Crushed, broken limestone | 4 | 10 |
| Prairie Sand & Gravel | Prairie Avenue Concrete, Inc. | Rock County, WI | Construction sand and gravel | 2 | 10 |
| Portable Unit #1 | Bjoin Limestone Inc | Rock County, WI | Crushed, broken limestone | 3 | 9 |
| Pioneer Jaw | Southern Wisconsin Aggregate Corporation | Rock County, WI | Construction sand and gravel | 2 | 9 |
| Cronin | Southern Wisconsin Aggregate Corporation | Rock County, WI | Construction sand and gravel | 2 | 9 |
| Jaw Sand and Gravel LLC (bradford Pit) | Jaw Sand and Gravel LLC | Rock County, WI | Construction sand and gravel | 8 | 6 |
| Footville Rock & Lime Corp | Footville Rock & Lime Corp | Rock County, WI | Crushed, broken limestone | 1 | 4 |
| Graystone Wash Screen | Southern Wisconsin Aggregate Corporation | Rock County, WI | Sand, industrial | 1 | 3 |
| Portable Plant #5 | Bjoin Limestone Inc | Rock County, WI | Dimension limestone | 2 | 2 |
| Union Pit | Jaw Sand and Gravel LLC | Rock County, WI | Construction sand and gravel | 2 | 2 |
| Lippman-Hewitt Jaw | Southern Wisconsin Aggregate Corporation | Rock County, WI | Crushed, broken limestone | 2 | 2 |
| Corporate Contractors Inc., Quarry Div. | Corporate Contractors, Inc | Rock County, WI | Crushed, broken limestone | 2 | 1 |
| Portable Unit #4 | Bjoin Limestone Inc | Rock County, WI | Crushed, broken limestone | 3 | 0 |
| Little Limestone Inc. | Little Limestone Inc | Rock County, WI | Crushed, broken limestone | 1 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken limestone | 8 | 50% |
| Construction sand and gravel | 6 | 37.5% |
| Dimension limestone | 1 | 6.2% |
| Sand, industrial | 1 | 6.2% |
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 | 23 | 1 | $4,025 | 0 |
| 2023 | 26 | 5 | $4,432 | 1 |
| 2024 | 17 | 3 | $2,709 | 0 |
| 2025 | 23 | 1 | $5,814 | 1 |
| 2026 | 19 | 2 | $2,963 | 0 |
Standards cited most at mines in Rock County, Wisconsin
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 56.12004 | Surface metal and nonmetal mines | 18 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 15 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 9 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.11003 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12013 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 47.44 | Hazard communication | 3 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 3 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
Injury and illness cases at mines in Rock County, Wisconsin
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 2 |
What the accident reports at mines in Rock County, Wisconsin describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 1 |
| Machinery | 1 |
Equipment named in accident reports at mines in Rock County, Wisconsin
| Equipment | Reports |
|---|---|
| Front-end loader | 1 |
| Impactor | 1 |
Updated November 6, 2026. Read from US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets. 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.