In 2010 EPA interviewed local citizens and reviewed the status of Butte area Superfund sites as part of a required five-year review (the full review report is available here). Five-year reviews determine whether remedies or other response actions are protective of human health and the environment in compliance with a site’s decision documents. Methods, findings, and conclusions are documented in […]

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1982-2013: 31 years since pumps stopped

Over 31 years ago economic factors led the Atlantic-Richfield Corporation, or ARCO, now a subsidiary of British Petroleum, to cease mining operations at the Berkeley Pit in Butte, Montana. Underground mining had come to an end seven years earlier, but the underground pumps had continued to operate, pumping groundwater out from the mines and the Berkeley Pit. The 1982 suspension […]

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The water level at the Berkeley Pit has been recorded every month for more than 23 years. In addition to that monitoring, scientists at the Montana Bureau of Mines and Geology have been sampling and analyzing water from the Berkeley Pit twice a year for its chemical composition and physical properties. In the Berkeley Pit, samples are taken from anywhere […]

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2010 Berkeley Pit Posters

This educational poster series covers Berkeley Pit history and ongoing environmental management at the site. Hard copies of the posters can be requested by emailing info@pitwatch.org. Posters are available free-of-charge for Clark Fork Basin educators and public organizations. The poster set includes: Download high-resolution versions of the posters using the links below.

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Irrigating with mine water

Post-mining redevelopment efforts in Butte rely on the availability of water to irrigate vegetation on reclaimed and capped areas. Water recovered from the Belmont mine and other parts of the flooded underground mine workings is a possible source of irrigation water that would reduce the stress on the city water supply, leaving more water in the Big Hole River. Butte-Silver […]

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