Since the Berkeley Pit was designated as a Superfund site in the 1980s, things have gone largely as expected. In one instance the site remedy has proceeded at a faster pace than mandated in the 1994 Record of Decision (or ROD, available in its entirety here). The ROD called for the water treatment plant for the Pit to be designed […]

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The 2013 print edition of PitWatch included the following photo from the Montana Bureau of Mines & Geology (MBMG), intended to show the current water level relative to the Critical Water Level. Some PitWatch readers asked for a version of this image that used a current photo of the Berkeley water level, and MBMG created this new image to better […]

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Berkeley Pit Timeline 2013

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Set by the U.S. EPA and Montana DEQ, the Critical Water Level, 5,410 feet, marks the point where full-scale pumping and treating of Berkeley Pit water will begin. The level represents the lowest level in the Butte Basin, the stream bottom of Silver Bow Creek. It was set to prevent any contamination from moving into surface and groundwater. The critical […]

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Summary of 2012 (published in March 2013) monitoring data related to the Butte Mine Flooding Consent Decree, which includes the Berkeley Pit and associated workings, from the Montana Bureau of Mines & Geology.    

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