USGS: Historical Mining Impacts Decreasing in Some Stream Reaches in Upper Clark Fork Basin

See on Scoop.itFrackInformant

HELENA, Mont. – Streams in the Upper Clark Fork Basin have shown a decrease or no change in the occurrence of metals and arsenic associated with historical mining, according to a new U.S. Geological Survey report released today. The largest decreases were in areas targeted by remediation efforts.

See on www.usgs.gov

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