Legislation aims to lift a long-standing ban on sulfide mining.
Environmentalists warn of risks to the Boundary Waters ecosystem.
Opponents are pushing for time to run out on the bill's passage.
Strategic angle: Concerns rise over potential environmental impacts as legislation moves forward.
Legislation aims to lift a long-standing ban on sulfide mining.
Environmentalists warn of risks to the Boundary Waters ecosystem.
Opponents are pushing for time to run out on the bill's passage.