EPA Air · stack tests by state, industry and year
Mining and quarrying (NAICS 2122): stack tests in Minnesota, 2025
- 16Stack tests
A stack test measures what a source actually emits, at the stack, against the limit in its permit. Each row is one stack test recorded during 2025 at a Minnesota source whose primary industry code is NAICS 2122. A facility filing more than one industry code is counted under the first one on its record.
Mining and quarrying (NAICS 2122) in Minnesota, other years
Other industries in Minnesota, 2025
- Utilities (NAICS 2211) 52
- Petroleum and coal products manufacturing (NAICS 3241) 26
- Chemical manufacturing (NAICS 3251) 19
- Mining and quarrying (NAICS 2123) 15
- Food manufacturing (NAICS 3112) 13
- Paper manufacturing (NAICS 3221) 11
- Pipeline transportation (NAICS 4862) 10
- Food manufacturing (NAICS 3113) 10
- Utilities (NAICS 2213) 9
- Plastics and rubber products manufacturing (NAICS 3261) 5
- Primary metal manufacturing (NAICS 3315) 5
- Primary metal manufacturing (NAICS 3313) 5
- Wood product manufacturing (NAICS 3219) 4
- Hospitals (NAICS 6221) 4
- Paper manufacturing (NAICS 3222) 3
Air-emissions stack tests recorded in Minnesota, 2025
| Date | Facility | Where | Kind | Agency |
|---|---|---|---|---|
| 2025-10-28 | NORTHSHORE MINING CO - SILVER BAY | SILVER BAY, Lake, MN | Pass | State |
| 2025-10-16 | UNITED STATES STEEL CORP - KEETAC | KEEWATIN, St. Louis, MN | Pass | State |
| 2025-10-13 | UNITED TACONITE LLC - FAIRLANE PLANT | FORBES, St. Louis, MN | Pass | State |
| 2025-09-15 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | Pass | State |
| 2025-09-08 | UNITED TACONITE LLC - THUNDERBIRD MINE | EVELETH, St. Louis, MN | Pass | State |
| 2025-07-22 | NORTHSHORE MINING CO - SILVER BAY | SILVER BAY, Lake, MN | Pass | State |
| 2025-07-07 | ULLAND BROTHERS INC | CLOQUET, Carlton, MN | Pass | State |
| 2025-07-07 | UNITED STATES STEEL CORP - KEETAC | KEEWATIN, St. Louis, MN | Pass | State |
| 2025-06-10 | HIBBING TACONITE CO | HIBBING, St. Louis, MN | Pass | State |
| 2025-05-12 | HIBBING TACONITE CO | HIBBING, St. Louis, MN | N/A | State |
| 2025-05-07 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | N/A | State |
| 2025-05-01 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | Pass | State |
| 2025-04-21 | US STEEL CORP - MINNTAC | MOUNTAIN IRON, St. Louis, MN | Pass | State |
| 2025-03-21 | UNITED TACONITE LLC - FAIRLANE PLANT | FORBES, St. Louis, MN | Pass | State |
| 2025-03-20 | NORTHSHORE MINING CO - SILVER BAY | SILVER BAY, Lake, MN | Pass | State |
| 2025-01-27 | UNITED TACONITE LLC - FAIRLANE PLANT | FORBES, St. Louis, MN | Pass | State |
Primary NAICS code as filed on the facility record; dates as filed by the agency that recorded the stack test. Figures from EPA’s ICIS-AIR download.