Project developer Aquila Resources on Monday announced that the state of Michigan had issued a final decision and order upholding the mining permit for its Back Forty zinc and gold project. The Menominee Indian Tribe of Wisconsin and an individual owing property near the project site in 2017 challenged the mining permit, but following hearings and testimony, a judge on May 3 ruled that the proposed mining operation would operate in compliance with the state’s non-ferrous metallic mining statute.