Montana Resources, in partnership with the Atlantic-Richfield Co., has pumped 9 billion gallons of treated Berkeley Pit water ...

To see the best of Butte, Montana, all Joyce OBill ... on the east side of town known as the Berkeley Pit, or just the pit, a former open-pit copper mine almost 1,800 feet deep.

An curved arrow pointing right. If migrating birds land on Montana's Berkeley Pit for just a few hours, they die. Now, miners use a rifle, drones, and lasers to scare them away. More from Science ...