Water levels in the Pit have been rising slower than the rate predicted in the 1994 EPA Record of Decision for the site. The most recent evaluation of monitoring data confirms previous predictions that it will be approximately 2023 when the water level approaches the critical level of 5,410 feet above sea level.

The illustration above show water levels in the Berkeley Pit and Pilot Butte mine shaft over time. The Pit has been filling with water slower than predicted in the 1994 EPA Record of Decision for the site. Graphic by Justin Ringsak.

The illustration above show water levels in the Berkeley Pit and Pilot Butte mine shaft over time. The Pit has been filling with water slower than predicted in the 1994 EPA Record of Decision for the site.

The current model and prediction assume the amount of water flowing into the Pit will stay fairly constant – enough water to raise the level in the Pit about 6 to 8 inches per month. The timeline, shown below, is reviewed and updated yearly.

This timeline reflects project changes agreed to in the Consent Decree that governs Berkeley Pit management. The timeline is reviewed and adjusted by the Montana Bureau of Mines & Geology each year. Any future timeline changes will be reported in PitWatch and on the PitWatch website at www.pitwatch.org. Graphic by Justin Ringsak.

This timeline reflects project changes agreed to in the Consent Decree that governs Berkeley Pit management. The timeline is reviewed and adjusted by the Montana Bureau of Mines & Geology each year. Any future timeline changes will be reported in PitWatch and on the PitWatch website at www.pitwatch.org. Click on the image to view a larger version.

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