At the Berkeley Pit, researchers hope to extract valuable metals to increase U.S. production of rare earths used in electric cars, medical advances and national defense. Ongoing extraction inside the ...

The Berkeley Pit in Butte, Montana, has been a source of environmental concern for decades, as its waters—highly acidic and teeming with toxins—have seeped into the surrounding area. But today, this ...

Butte, Mont. • There’s a tale told about a miner who found copper cans in his garbage dump in the early days of mining. Wastewater from copper mining had flowed through his land, he said, and turned ...