Michigan environmental regulators say they've approved plans for a copper and silver mine in the far western Upper Peninsula.
The Department of Environmental Quality said Monday it had determined that Orvana Resources U.S. Corp.'s application for a mining permit meets state mining standards.
The department in March gave tentative approval. The DEQ says it's still reviewing other related permits for the project including air emissions and water discharges.
Orvana is targeting 798 million pounds of copper and 3.5 million ounces of silver in an underground deposit near Ironwood.
Environmentalists have raised concerns about the company's plans to withdraw large volumes of Lake Superior water and discharge treated wastewater into a creek that feeds the lake. Company officials say a buffer zone will provide adequate protection..
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