Posted at: 04/05/2013 11:59 AM
MARQUETTE, Mich. (AP) - Tests have turned up uranium in water samples from a rock storage area at a nickel and copper mine under construction in Michigan's Upper Peninsula.
The Mining Journal of Marquette reports Friday the tests were conducted by the mining company Rio Tinto and a nonprofit group called the Superior Watershed Partnership.
Jon Becker of the watershed partnership says the presence of uranium is unexpected but doesn't appear to violate state or federal permits the company obtained. He says they're trying to identify the source.
Rio Tinto's Eagle Mine is in a rural area northwest of Marquette. It has a water treatment plant.
The uranium was found in an area where waste rock from tunnel excavation will be stored until it's put back to fill areas where ore was removed.
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