Study details slope stability

The rate of rise of water levels in the Berkeley Pit and connected monitoring points is affected by many factors, including rain and snowfall and occasional ‘sloughs’ or ‘slumps’ of material from the Pit’s sidewall slopes. The most recent slough occurred on February 8, 2013. An estimated 820,000 tons of material from the southeast wall collapsed into the Pit. Montana […]

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The Montana Bureau of Mines & Geology (MBMG) developed this computer model showing Butte topography and the corresponding underground tunnels from the years of historic underground mining. The red dots at the surface and red lines below represent vertical shafts, and the colored lines under the surface represent the horizontal levels of the mines. The graphic does not illustrate stopes […]

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Since 1997, the Berkeley Pit Public Education Committee has given awards at annual Montana Tech Science & Engineering Fairs to students with projects that explore topics related to the Berkeley Pit. At the 2013 fair, five students received awards for Pit-related projects. Brian McGeehan from Butte Central received an award for his project, How Can We Clean Up the Berkeley […]

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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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A performance test of the Horseshoe Bend plant was completed in November 2007, as mandated by the Record of Decision. Based on the performance review, water discharged from the plant meets all discharge standards for contaminants of concern set by the EPA. Additional adjustments still need to be made to address pH. In general, plant operations are going as expected. […]

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