Berkeley Pit

Silver Bow Creek/Butte Area
Superfund site
Berkeley Pit (center) and Yankee Doodle Tailings Pond (upper left) with terraced levels/access roadways. The city of Butte is at lower right.
Geography
City	Butte
County	Silver Bow
State	Montana
Coordinates	46°01′N 112°31′W / 46.02°N 112.51°W / 46.02; -112.51
Butte Location in the United States Show map of the United States Butte Location in Montana Show map of Montana
Information
CERCLIS ID	MTD980502777
Contaminants	Arsenic, cadmium, copper, zinc, lead
Progress
Proposed	30 December 1982
Listed	8 September 1983
List of Superfund sites

The Berkeley Pit is a former open pit copper mine in the western United States, located in Butte, Montana. It is one mile (1.6 km) long by one-half mile (800 m) wide, with an approximate maximum depth of 1,780 feet (540 m). It is filled to a depth of about 900 feet (270 m) with water that is acidic (4.1 - 4.5 pH level), about the acidity of beer or tomatoes.^[1] As a result, the pit's water is laden with heavy metals and dissolved metals that leach from the rock in a natural process known as acid rock drainage. The dissolved metals include but are not limited to copper, arsenic, cadmium, zinc, and sulfuric acid.

The mine was opened in 1955 and operated by the Anaconda Copper Mining Company, and later by the Atlantic Richfield Company (ARCO), until its closure on April, 22 in 1982.^[2] When the pit was closed, the water pumps in the nearby Kelley Mine, 3,800 ft (1,200 m) below the surface, were turned off, and groundwater began to slowly fill the Berkeley Pit, rising at about the rate of one foot (30 cm) per month. Since its closure, the water level in the pit has risen to within 150 feet (46 m) of the "protective water level", above which the polluted water might flow into a nearby creek and other local water sources.^[3] As a result, a water treatment plant has been operating at the site since October 2019.^[4]

The Berkeley Pit can be visited by tourists, with a viewing stand and small visitor center.^[5][6]