There’s another variable Uerling has considered — changes in stream “conductivity” linked to the discharge of treated mine ...

MISSOULA — It would dwarf the Berkeley Pit: A hole blasted and dug into the Alaskan landscape about a half-mile deep and 2.5 miles across. What could go wrong in the pursuit of what’s touted ...

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 ...

There’s another variable Uerling has considered — changes in stream “conductivity” linked to the discharge of treated mine water from the Berkeley Pit. That water has been discharged since ...