Data / Mines / Wisconsin / Tunnel City
Tunnel City, Monroe County, Wisconsin: 55 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Tunnel City is an active construction sand and gravel surface mine in Monroe County, Wisconsin, operated by Iron Oak Sand LLC with 12 employees on MSHA's record (mine ID 4703699). Since January 1, 2022 MSHA inspectors issued 55 citations and orders there with $23,216 in proposed penalties, and 19 accident reports were filed there, with 18 injury or illness cases.
The request: Watch Tunnel City (MSHA mine ID 4703699) in Monroe County, Wisconsin: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 4703699
- Status
- Active since February 28, 2014
- Main commodity
- Construction sand and gravel
- Mine type
- Surface
- County
- Monroe County, Wisconsin
- Nearest town
- Tunnel City
- Operator
- Iron Oak Sand LLC
- Parent company
- Iron Oak Energy Solutions LLC
- Employees
- 12
- MSHA field office
- Peru IL Field Office
- Citations and orders since January 1, 2022
- 55
- Significant and substantial
- 5 (9.1%)
- Closure orders
- 0
- High negligence or reckless
- 4
- Proposed penalties
- $23,216
- Amount paid so far
- $15,540
- Inspections
- 20
- Inspector hours on site
- 444
- Citations per inspection
- 2.75 (all mines 2.30)
- Accident reports
- 19
- Injury and illness cases
- 18
- Fatalities
- 0
- Latest MSHA record
- October 3, 2026
- Citations issued to contractors here
- 9 ($2,256 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 | 18 | 1 | $7,474 | 7 |
| 2023 | 19 | 3 | $5,485 | 3 |
| 2024 | 13 | 0 | $1,977 | 3 |
| 2025 | 3 | 0 | $453 | 3 |
| 2026 | 2 | 1 | $7,827 | 2 |
Standards cited most at Tunnel City
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 56.12032 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 3 |
| 30 CFR 47.44 | Hazard communication | 2 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4101 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.12018 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.11016 | Surface metal and nonmetal mines | 1 |
| 30 CFR 57.4104 | Underground metal and nonmetal mines | 1 |
Injury and illness cases at Tunnel City
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 13 |
| No lost time, or an occupational illness | 5 |
What the accident reports at Tunnel City describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 5 |
| Handling of materials | 4 |
| Handtools (nonpowered) | 4 |
| Machinery | 3 |
| Powered haulage | 2 |
| Other | 1 |
Equipment named in accident reports at Tunnel City
| Equipment | Reports |
|---|---|
| Hand tools (not powered) | 4 |
| Ore haulage trucks - off highway trucks | 3 |
| Front-end loader | 2 |
| Welding machine | 1 |
| Pump | 1 |
Other open mines in Monroe County, Wisconsin
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| 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 |
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.