Denver (AP) Workers have begun drilling a relief well into a collapsed mine-drainage tunnel above Leadville.
The environmental protection agency said Wednesday that the work is expected to take two or three weeks. When the drilling is done, a pump will be installed to remove contaminated water that has built up in the tunnel.
A cave-in detected in 1995 has caused an estimated 1 billion gallons of water to back up inside mine shafts that the tunnel was designed to drain.
The EPA hopes to start pumping out water by mid-June before treating it and releasing it into the Arkansas river.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or email@example.com.