"BUTTE, Mont. — The long-awaited discharge of treated wastewater from a former open pit copper mine into Silver Bow Creek in Butte has started with little fanfare.
The discharge from Berkeley Pit is being done by Montana Resources and Atlantic Richfield Co. The work by the companies began Monday, four years ahead of the point when acidic, metal-laden water from the mine could reach the water table.
Berkeley Pit was allowed to fill with groundwater beginning in 1982 and listed as a Superfund cleanup site in 1983."
Source: AP, 10/02/2019
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