Strata Corp: 17 open mines, 66 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Strata Corp (MSHA operator ID L09644) operates 17 open mines with 71 employees in Minnesota, North Dakota, Montana, mostly construction sand and gravel. Since January 1, 2022 MSHA inspectors issued it 66 citations and orders with $21,269 in proposed penalties, and it reported 3 injury or illness cases. Data from MSHA, November 6, 2026.
The request: Watch Strata Corp (MSHA operator ID L09644): each new citation, each accident report and each new mine. $10 of work on sign-up, no card.
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- MSHA operator ID
- L09644
- Open mines
- 17
- Employees at open mines
- 71
- States
- Minnesota, North Dakota, Montana
- Parent company
- Knife River Corporation
- Citations and orders since January 1, 2022
- 66
- Significant and substantial
- 16 (24.2%)
- Closure orders
- 3
- High negligence or reckless
- 4
- Proposed penalties
- $21,269
- Amount paid so far
- $18,536
- Inspections
- 101
- Inspector hours on site
- 456
- Citations per inspection
- 0.65 (all mines 2.30)
- Accident reports
- 3
- Injury and illness cases
- 3
- Fatalities
- 0
- Latest MSHA record
- October 21, 2026
Open mines of Strata Corp
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Portable Plant #6 | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 6 | 11 |
| Detroit Lakes Plant | Strata Corp | Becker County, MN | Construction sand and gravel | 12 | 10 |
| Portable Plant #2 | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 6 | 5 |
| 218 Plant | Strata Corp | Polk County, MN | Construction sand and gravel | 4 | 5 |
| Portable Plant #3 | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 4 | 4 |
| Rollag Plant | Strata Corp | Clay County, MN | Construction sand and gravel | 3 | 4 |
| Star Plant | Strata Corp | Barnes County, ND | Construction sand and gravel | 3 | 4 |
| Portable Plant # 9 | Strata Corp | Richland County, MT | Construction sand and gravel | 2 | 4 |
| Verdendrye Plant | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 4 | 3 |
| Portable Plant #10 | Strata Corp | Clay County, MN | Construction sand and gravel | 2 | 3 |
| Warroad Plant | Strata Corp | Lake Of The Woods County, MN | Crushed, broken stone | 5 | 2 |
| Portable Crushing Plant #1 | Strata Corp | Polk County, MN | Construction sand and gravel | 3 | 2 |
| Forester Pit | Strata Corp | Kittson County, MN | Construction sand and gravel | 2 | 2 |
| Portable Plant #5 | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 1 | 2 |
| Northern Sand & Gravel | Strata Corp | Polk County, MN | Construction sand and gravel | 8 | 1 |
| Portable Plant #7 | Strata Corp | Grand Forks County, ND | Construction sand and gravel | 4 | 0 |
| Portable Plant #8 | Strata Corp | Eddy County, ND | Construction sand and gravel | 2 | 0 |
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 | 12 | 4 | $11,194 | 2 |
| 2023 | 21 | 3 | $3,602 | 0 |
| 2024 | 12 | 4 | $2,290 | 1 |
| 2025 | 10 | 2 | $1,662 | 0 |
| 2026 | 11 | 3 | $2,521 | 0 |
Standards cited most at Strata Corp
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 | 19 |
| 30 CFR 56.14101 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 5 |
| 30 CFR 56.11002 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 3 |
| 30 CFR 56.12030 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.13015 | Surface metal and nonmetal mines | 2 |
| 30 CFR 47.44 | Hazard communication | 2 |
| 30 CFR 56.9300 | Surface metal and nonmetal mines | 2 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 2 |
| 30 CFR 46.5 | Training at sand, gravel and surface stone mines | 2 |
| 30 CFR 56.14207 | Surface metal and nonmetal mines | 1 |
| 30 CFR 56.14132 | Surface metal and nonmetal mines | 1 |
| 30 CFR 41.12 | Notice of legal identity | 1 |
| 30 CFR 56.18002 | Surface metal and nonmetal mines | 1 |
Injury and illness cases at Strata Corp
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Permanent disability | 1 |
| Days away from work or restricted activity | 1 |
| No lost time, or an occupational illness | 1 |
What the accident reports at Strata Corp describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Powered haulage | 2 |
| Slip or fall of person | 1 |
Equipment named in accident reports at Strata Corp
| Equipment | Reports |
|---|---|
| Conveyor | 2 |
Commodities
| Main commodity | Open mines |
|---|---|
| Construction sand and gravel | 16 |
| Crushed, broken stone | 1 |
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.