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This company started mining in 1986 and mined until 1999.

Gilt Edge is one of six sites suggested by PolyMet opponents. (It wasn't their top choice; that was the Mount Polley Mine in Canada, where a tailings basin recently failed, spilling over a billion gallons of waste. Dayton said that site was too remote.)

The 360-acre Gilt Edge Mine site is about 6 miles east of Lead, S.D. Amy Varland | SDPB

In many ways, Gilt Edge is a poster child for mine opponents' worst fears.

The Brohm Mining Company began mining in 1986. Thirteen years later the company went bankrupt.

"We went to court to prevent them from leaving," said Bill Markley, administrator of the groundwater quality program at the South Dakota Department of Environment and Natural Resources. "But finally they ran out of money and disappeared and the state took over."

From: Dayton looks for answers in mine tours

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