Clean Water Act discharge permit · NPDES MT0028584
YELLOWSTONE MINE, Cameron, MT: NPDES MT0028584 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
YELLOWSTONE MINE, held by MAGRIS TALC USA INC, holds NPDES permit MT0028584, which discharges to Johnny Gulch Creek - West & East. EPA’s file records it issued June 4, 2014 and expiring July 31, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | YELLOWSTONE MINE |
|---|---|
| Permittee as filed | MAGRIS TALC USA INC |
| NPDES ID | MT0028584 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 4, 2014 |
| Expiration date | July 31, 2019 |
| Address | Cameron, MT 59720 |
| Receiving water | JOHNNY GULCH CREEK - WEST & EAST |
| Subwatershed | Madison River-McAtee Bridge (HUC 100200070804) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 15Pollutants on file
- 8Under a numeric limit
- 14With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| pH | 4 | 12 | 0 | ||
| Solids, total suspended | 6 | 9 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 9 | 0 | ||
| Nitrogen, total [as N] | 8 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 6 | 0 | ||
| Oil & Grease | 0 | 6 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 6 | 0 | ||
| Iron, total recoverable | 0 | 6 | 0 | ||
| Zinc, total recoverable | 0 | 6 | 0 | ||
| Flow rate | 0 | 5 | 0 | ||
| Oil and grease, hexane extr method | 5 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 3 | 0 | ||
| Flow rate | 6 | 2 | 0 | ||
| Precipitation, total defined period/in | 0 | 2 | 0 | ||
| Phosphorus, total [as P] | 4 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MT0028584.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 23, 2026 | Permit Violations - Application Incomplete | ST6 |
| June 23, 2026 | Monitoring Violations - Analysis not Conducted | ST6 |
| June 23, 2026 | Management Practice Violations - Best Management Practice Deficiencies | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MT0028584 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.