| 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 |
  Butte Location in the United States  Butte Location in 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]
- ^ Gammons & Icopini 2020 "Improvements to the Water Quality of the Berkeley Pit due to Copper Recovery and Sludge Disposal". Mine Water and the Environment, 2020.
- ^ "Anaconda to abandon Butte mine". Lewiston Morning Tribune. (Idaho). Associated Press. 24 April 1982. p. 4A.
- ^ "Protective Water Level". PitWatch. Berkeley Pit Public Education Committee. Retrieved 7 May 2024.
- ^ "Water Treatment". PitWatch. Berkeley Pit Public Education Committee. Retrieved 24 June 2024.
- ^ "Visit Us". PitWatch. Berkeley Pit Public Education Committee. Retrieved 24 June 2024.
- ^ "The Trolley". Butte-Silver Bow Chamber of Commerce. Retrieved 24 June 2024.