A legislator plans to introduce a bill this session that would lift Wisconsin's mining moratorium.

Gov. Tommy Thompson signed the moratorium into law in 1998. It requires companies to prove a sulfide mine can run for a decade without polluting state waters and a sulfide mine has been closed in the state for a decade without polluting the water.

Wisconsin Public Radio reported Tuesday that Republican Sen. Tom Tiffany of Hazelhurst plans to introduce a bill this session repealing the moratorium. He says the Flambeau copper mine near Ladysmith proves a sulfide mine can operate safely, making the moratorium moot.

That mine operated for four years. A federal judge found the mine discharged copper into state waters but it was minimal. An appellate court reversed the judgment in 2013.

This story has been corrected to reflect that Wisconsin Public Radio published its report on Tuesday. KBJR