The statement came hours after the independent newspaper Novaya Gazeta reported that water tainted with heavy metals from the tailings at a nickel-processing plant were being pumped into a river.
Nornickel said the water was improperly pumped because of an overflowing sump; it said the water was “clarified” and there is no threat of waste leakage.
Both facilities are near Norilsk, north of the Arctic Circle, 2,900 kilometers (1,800 miles) northeast of Moscow.
This story has been corrected to show that the name of the company is Nornickel, not Norilsk Nickel.
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