Berkeley Pit Timeline 2013

Read More...

Set by the U.S. EPA and Montana DEQ, the Critical Water Level, 5,410 feet, marks the point where full-scale pumping and treating of Berkeley Pit water will begin. The level represents the lowest level in the Butte Basin, the stream bottom of Silver Bow Creek. It was set to prevent any contamination from moving into surface and groundwater. The critical […]

Read More...

In past years, many visitors were curious about the waterfall visible from the Pit Viewing Stand. Montana Resources pumped water out of the Berkeley Pit, then removed the copper from that water before returning it to the Pit (click here for more information on mining copper from Pit water). The waterfall was created by this returning water. However, this activity […]

Read More...

The Horseshoe Bend Water Treatment Plant can be seen on the northeast edge of the Pit. The plant was constructed in 2002-2003 to fulfill the EPA Record of Decision, which requires that surface water flowing into the Berkeley Pit be captured and either used in the mining process or treated. The Horseshoe Bend Water Treatment Plant, completed in 2003, captures […]

Read More...

Yes, after a treatment technology review and upgrades to the plant are completed. The 1994 EPA Record of Decision and 2002 Consent Decree require a review of treatment technologies when the Critical Water Level (5,410 feet) is about four years away. The review will consider the plant’s ability to treat both Pit water and water coming from the Horseshoe Bend […]

Read More...