The water level in the Berkeley Pit in 2013, compared to the Critical Water Level. Current projections show that the water level in one of the monitoring compliance points around the Pit, such as the Pilot Butte or Anselmo mine shafts, will reach the critical level around 2023, triggering pumping-and-treating of Pit water to maintain its level below the critical point. Photo by Ted Duaime of the Montana Department of Mines & Geology.

The water level in the Berkeley Pit in 2013, compared to the Critical Water Level. Current projections show that the water level in one of the monitoring compliance points around the Pit, such as the Pilot Butte or Anselmo mine shafts, will reach the critical level around 2023, triggering pumping-and-treating of Pit water to maintain its level below the critical point. Photo by Ted Duaime of the Montana Department of Mines & Geology.

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