Montana Trout Unlimited v. Tintina

Summary

The Court held that DEQ complied with the MMRA and MEPA when it approved Tintina’s proposed cemented tailings facility, evaluated nitrogen discharges into Sheep Creek, and considered project alternatives. The Court concluded that DEQ’s decisions were supported by substantial evidence, reflected a rational connection between the record and its conclusions, and were entitled to deference regarding technical and scientific matters. It therefore reversed the District Court and remanded for reinstatement of Tintina’s permit.