SPOKANE, Wash. — Toxic mine pollution is no longer flowing into Washington state’s picturesque Lake Chelan for the first time in nearly 60 years because of a $500 million cleanup to contain contamination from the a mine, officials said this week.
The payoff of the mine cleanup means that clean water now flows into a creek that feeds the lake, a prime recreation destination, said Kari Grover Wier, district ranger for the Wenatchee National Forest, where the lake is located.
The Holden Mine operated from 1938 to 1957, extracting copper, zinc, gold and silver.
It was abandoned in 1957, but continued to contaminate the environment with toxic metals including aluminum, cadmium, copper, iron and zinc.
The metals also created a hazardous, hard orange coating on the creek’s streambed.
Unstable waste rock and tailings piles from about 10 million tons of mined ore further compounded the problem, the U.S. Forest Service said.
No taxpayer funds were used, the Forest Service said.
As part of the project, a 30-to-90 foot (9-to-27 meters) concrete barrier wall was erected between toxic mine tailings piles and Railroad Creek to prevent runoff.
Thousands of gallons of contaminated ground water are also treated daily at a plant on the site.
The cleanup spending sent about $240 million into the local economies because much of the work was performed by people and businesses in the area, the Forest Service said.