Maps of Berkeley Pit Monitoring Sites

Maps from the Montana Bureau of Mines & Geology (MBMG) showing Berkeley Pit-related alluvial and bedrock monitoring sites have been added to PitWatch.Org. View snapshots of the maps below, click on an image to view a larger version, or use the links at the bottom of the page to download printable .pdf versions of the maps.      

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West Camp also part of mine flooding site

The anatomy of the thousands of miles of tunnels beneath the Butte Hill is daunting to consider and little understood by many. Important details, such as the distinction between the “West Camp” and “East Camp”, can cause consternation for many a curious observer. The Berkeley Pit and surrounding underground mine workings and bedrock wells are referred to as the “East […]

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What is an ‘Operable Unit’?

An operable unit is a subsection of a larger EPA Federal Superfund site. There are four Operable Units (OUs) in the Butte mining district.  The Butte Mine Flooding Operable Unit, which includes the Berkeley Pit, the hydraulically-connected underground mine workings associated with the historic East Camp and West Camp tunnel systems, associated bedrock, and alluvial aquifers. The area covers approximately […]

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Learning About The Westcamp


PitWatch Issue Volume 3, Number 2 Previous issues of PITWATCH have been devoted almost exclusively to the Berkeley Pit and surrounding “East Camp” underground wells and mine workings. Another area of the underground water system called West Camp also deserves our attention. The West Camp lies southwest of the Berkeley Pit/East Camp drainage and includes the Travona, Emma, and Ophir […]

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High Water History


 PitWatch Issue Volume 3, Number 2 When the Anaconda Company stopped pumping groundwater out of the West Camp in 1965, the water level in the Travona quickly climbed to over 5,500 feet. Water started seeping into basements in the area bounded by Iron Street in the north, Front Street in the south, Montana Street in the west, and Maryland […]

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