Data / Mines / Wisconsin / Unit No. 21
Unit No. 21, Dane County, Wisconsin: 2 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Unit No. 21 is an intermittent crushed, broken limestone surface mine in Dane County, Wisconsin, operated by Yahara Materials Inc with 28 employees on MSHA's record (mine ID 4703904). Since January 1, 2022 MSHA inspectors issued 2 citations and orders there with $294 in proposed penalties, and 0 accident reports were filed there, with no injury or illness cases.
The request: Watch Unit No. 21 (MSHA mine ID 4703904) in Dane County, Wisconsin: each new citation and each accident report. $10 of work on sign-up, no card.
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- MSHA mine ID
- 4703904
- Status
- Intermittent since August 20, 2021
- Main commodity
- Crushed, broken limestone
- Mine type
- Surface
- County
- Dane County, Wisconsin
- Nearest town
- Waunakee
- Operator
- Yahara Materials Inc
- Employees
- 28
- MSHA field office
- Peru IL Field Office
- Citations and orders since January 1, 2022
- 2
- Significant and substantial
- 1 (50.0%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $294
- Amount paid so far
- $294
- Inspections
- 7
- Inspector hours on site
- 10
- Citations per inspection
- 0.29 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- September 1, 2026
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 |
|---|---|---|---|---|
| 2024 | 2 | 1 | $294 | 0 |
Standards cited most at Unit No. 21
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 | 1 |
| 30 CFR 56.14205 | Surface metal and nonmetal mines | 1 |
Other open mines in Dane County, Wisconsin
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Norway Grove Gravel Plant | Madison Sand & Gravel Company Inc | Dane County, WI | Construction sand and gravel | 12 | 28 |
| Capitol Sand | Payne & Dolan Inc | Dane County, WI | Construction sand and gravel | 11 | 24 |
| Center Road Quarry | K&D Stone LLC | Dane County, WI | Lime | 2 | 15 |
| Unit No 1 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 10 |
| Plant #12 Permanent Washplant | Wingra Stone Company | Dane County, WI | Sand, common | 2 | 9 |
| Universal Impact Crusher | Tri-County Paving, Inc. | Dane County, WI | Crushed, broken limestone | 2 | 9 |
| Unit No. 14 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 8 |
| Wash Plant-Maier | Tri-County Paving, Inc. | Dane County, WI | Construction sand and gravel | 2 | 7 |
| Unit No. 16 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 6 |
| 79-88 Lippmann Crusher | R G Huston Company, Inc. | Dane County, WI | Crushed, broken limestone | 2 | 6 |
| Plant #4 Portable Crusher | Wingra Stone Company | Dane County, WI | Crushed, broken limestone | 3 | 5 |
| Unit No. 3 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 5 |
| Unit No. 5 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 5 |
| Unit No. 7 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 5 |
| Unit No. 12 | Yahara Materials Inc | Dane County, WI | Crushed, broken limestone | 2 | 5 |
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.