It is said that there are over 10,000 miles of tunnels underneath Butte, Montana. This amazing Image, created by the Montana Bureau of Mines and Geology, shows the vertical shafts, horizontal tunnels, and the Berkeley Pit. The red rectangles above ground represent the big black headframes you see all over town.
All of these tunnels and the Berkeley Pit are now filled with toxic groundwater that is laden with all sorts of metals and has a pH of about 2.
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