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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How is the Pit monitored?

The Montana Bureau of Mines & Geology (MBMG) measures the water levels at the Pit and in connected mine shafts and wells each month. To monitor water quality, water samples are collected from the Pit semi-annually at multiple depths as safe access allows. 23 wells and 14 mine shafts supply information about the deep bedrock aquifer. 36 wells provide similar […]

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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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