Data / Mines / Wisconsin / Monroe County
Mines in Monroe County, Wisconsin: 17 open mines
MSHA lists 17 open mines in Monroe County, Wisconsin, run by 8 operators and employing 130 people. Since January 1, 2022 its inspectors issued 150 citations and orders there with $38,860 in proposed penalties, and operators reported 42 injury or illness cases. The operators with the most open mines are Gerke Excavating Inc; River City Stone Division Of Mathy Construction Co; Iron Oak Sand LLC. Data from MSHA, November 6, 2026.
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- Open mines
- 17
- Operators
- 8
- Employees
- 130
- Intermittent
- 11
- Active
- 6
- Citations and orders since January 1, 2022
- 150
- Significant and substantial
- 15 (10.0%)
- Closure orders
- 1
- High negligence or reckless
- 8
- Proposed penalties
- $38,860
- Amount paid so far
- $28,318
- Inspections
- 140
- Inspector hours on site
- 1,794
- Citations per inspection
- 1.07 (all mines 2.30)
- Accident reports
- 44
- Injury and illness cases
- 42
- Fatalities
- 0
- Latest MSHA record
- November 4, 2026
Operators with the most open mines in Monroe 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 |
|---|---|---|---|---|---|
| Gerke Excavating Inc | 8 | 20 | 21 | $3,147 | 1 |
| River City Stone Division Of Mathy Construction Co | 3 | 11 | 4 | $604 | 1 |
| Iron Oak Sand LLC | 1 | 12 | 55 | $23,216 | 18 |
| Smart Sand, Inc | 1 | 50 | 31 | $6,289 | 14 |
| HC Wyeville Operating LLC | 1 | 30 | 23 | $3,675 | 7 |
| U.S. Silica Energy Company | 1 | 2 | 7 | $609 | 1 |
| Brooks Excavating LLC | 1 | 2 | 6 | $886 | 0 |
| Carri Scharf Materials | 1 | 3 | 3 | $435 | 0 |
Operators with the most citations in Monroe 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 |
|---|---|---|---|---|---|
| Iron Oak Sand LLC | 1 | 12 | 55 | $23,216 | 18 |
| Smart Sand, Inc | 1 | 50 | 31 | $6,289 | 14 |
| HC Wyeville Operating LLC | 1 | 30 | 23 | $3,675 | 7 |
| Gerke Excavating Inc | 8 | 20 | 21 | $3,147 | 1 |
| U.S. Silica Energy Company | 1 | 2 | 7 | $609 | 1 |
| Brooks Excavating LLC | 1 | 2 | 6 | $886 | 0 |
| River City Stone Division Of Mathy Construction Co | 3 | 11 | 4 | $604 | 1 |
| Carri Scharf Materials | 1 | 3 | 3 | $435 | 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 |
|---|---|---|---|---|---|
| Tunnel City | Iron Oak Sand LLC | Monroe County, WI | Construction sand and gravel | 12 | 55 |
| Smart Sand, Inc. | Smart Sand, Inc | Monroe County, WI | Sand, industrial | 50 | 31 |
| HC Wyeville Mine | HC Wyeville Operating LLC | Monroe County, WI | Sand, industrial | 30 | 23 |
| Sparta, WI Plant | U.S. Silica Energy Company | Monroe County, WI | Sand, industrial | 2 | 7 |
| Gerke Plant #1 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 1 | 7 |
| Mack Quarry | Brooks Excavating LLC | Monroe County, WI | Sand, common | 2 | 6 |
| Gerke Plant #6 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 3 | 5 |
| Plant #32 | River City Stone Division Of Mathy Construction Co | Monroe County, WI | Crushed, broken limestone | 8 | 4 |
| Gerke Plant #3 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 4 | 4 |
| Sparta Plant | Carri Scharf Materials | Monroe County, WI | Sand, industrial | 3 | 3 |
| Gerke Plant #4 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 3 | 2 |
| Gerke Plant #7 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 3 | 2 |
| Plant # 21 | Gerke Excavating Inc | Monroe County, WI | Construction sand and gravel | 2 | 1 |
| Gerke Plant #22 | Gerke Excavating Inc | Monroe County, WI | Crushed, broken limestone | 2 | 0 |
| Gerke Plant #24 | Gerke Excavating Inc | Monroe County, WI | Sand, common | 2 | 0 |
| Plant 93 | River City Stone Division Of Mathy Construction Co | Monroe County, WI | Sand, industrial | 2 | 0 |
| Plant #79 | River City Stone Division Of Mathy Construction Co | Monroe County, WI | Construction sand and gravel | 1 | 0 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Crushed, broken limestone | 7 | 41.2% |
| Sand, industrial | 5 | 29.4% |
| Construction sand and gravel | 3 | 17.6% |
| Sand, common | 2 | 11.8% |
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 | 43 | 4 | $11,880 | 12 |
| 2023 | 34 | 4 | $7,993 | 9 |
| 2024 | 32 | 3 | $5,254 | 5 |
| 2025 | 26 | 1 | $3,740 | 5 |
| 2026 | 15 | 3 | $9,994 | 11 |
Standards cited most at mines in Monroe 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 | 14 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 14 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 12 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 11 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 9 |
| 30 CFR 50.30 | Reporting of accidents, injuries and illnesses | 8 |
| 30 CFR 56.12008 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 4 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 4 |
| 30 CFR 47.44 | Hazard communication | 3 |
Injury and illness cases at mines in Monroe County, Wisconsin
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 22 |
| No lost time, or an occupational illness | 20 |
What the accident reports at mines in Monroe County, Wisconsin describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 16 |
| Handtools (nonpowered) | 8 |
| Powered haulage | 7 |
| Slip or fall of person | 6 |
| Machinery | 4 |
| Nonpowered haulage | 1 |
| Fire | 1 |
| Other | 1 |
Equipment named in accident reports at mines in Monroe County, Wisconsin
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 8 |
| Front-end loader | 4 |
| Ore haulage trucks - off highway trucks | 3 |
| Forklift | 2 |
| Hand tools (powered) | 1 |
| Mancar | 1 |
| Machine | 1 |
| Shovel | 1 |
| Welding machine | 1 |
| Pump | 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.