The Berkeley Pit in Butte, Montana, 1984. Photo from Fritz Daily.

The Berkeley Pit in Butte, Montana, 1984.

PitWatch Volume 5, Number 2

In July 2000, Montana Resources suspended mining operations. The suspension has had a direct impact on the Berkeley Pit water levels and efforts are underway to deal with the problem.

The immediate concern is treating the Horseshoe Bend water, which had been diverted away from the Berkeley Pit since 1996. Based on data from July 1 to September 30, 2000, about four to five million gallons per day is entering the Pit from the Horseshoe Bend flow. Montana Resources had been treating this water as part of its mine operations.

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