Environmental Effects
In 1995, a flock of migrating snow geese landed in the Berkeley Pit water and died, with 342 carcasses recovered. ARCO, the custodian of the pit, denied that the toxic water caused the death of the geese, attributing the deaths to an acute aspergillosis infection that may have been caused by a grain fungus, as substantiated by Colorado State University necropsy findings. These findings were disputed by the State of Montana on the basis of its own lab tests. Necropsies showed their insides were lined with burns and festering sores from exposure to high concentrations of copper, cadmium, and arsenic.
The most recent development in the clean-up was the construction of a treatment plant on Horseshoe Bend. This facility treats and diverts water coming from the Horseshoe Bend flow. In addition, it will be able to treat the existing Berkeley Pit water in 2018, or whenever the water level hits the critical point of 5,410 feet (1,650 m) above sea level. This number was set by federal order and is intended to protect the ground water from being contaminated by the water in the pit.
The Berkeley Pit is on the federal Superfund site list.
Read more about this topic: Berkeley Pit
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