Caleb Uerling, a fisheries biologist for Montana Fish, Wildlife & Parks, believes the high conductivity of treated Berkeley ...

Caleb Uerling, a fisheries biologist for Montana Fish, Wildlife & Parks, believes the high conductivity of treated Berkeley Pit water discharged into Silver Bow Creek could affect trout.

Berkeley Pit, an open-pit copper mine that has been allowed to fill with water since its closure in 1982, is seen in this October, 2003 file photo. Credit: WALTER HINICK /THE MONTANA STANDARD VIA ...

“Fish, like most other organisms in the stream ... Treating the contaminated Berkeley Pit has been a team effort of Montana Resources and Atlantic Richfield/BP. The campaign focuses on ...