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Alaska’s Lower Slate Lake to become toxic waste dump


By Stephen C. Webster

Published: August 16, 2009
Updated 6 months ago




The Army Corps of Engineers has approved a permit for Coeur Alaska Inc. to use Lower Slate Lake as a dumping site for millions of tons of toxic waste produced at the nearby Kensington gold mine.

“The project has been the subject of a national environmental fight over whether navigable lakes and rivers can be used as repositories for toxic mine tailings,” reported The Los Angeles Times. “The corps last week announced it was extending Coeur Alaska’s permit until 2014 and reiterated that the company could construct a tailings storage facility in Lower Slate Lake, below the mine.”

Sen. Mark Begich (D-AK), who has been a proponent of the plan to deposit the toxic mine tailings in the lake, said in a prepared statement that once the project is finished, it will provide an “improved fish habitat.”

Mine tailings are the useless substances left over after a valuable ore has been extracted from the ground. Tailings are usually suspended in waste water, but can also be made into a paste and stacked in layers on dry land.

In January, lawyers for Coeur Alaska argued before the Supreme Court that even while their dumping would kill all the lake’s aquatic life, after 10 years of mining the lake could restocked with live fish.

The Army Corps of Engineers first approved the permit in 2005. However, “[environmentalists] sued to halt the practice, saying dumping the mine tailings in the lake would kill fish,” the Associated Press reported. “A federal appeals court blocked the permit, saying the dumping is barred by stringent Environmental Protection Agency requirements under the Clean Water Act of 1972.”

It was eventually appealed to the Supreme Court, which upheld the project’s legality.

“The Supreme Court case centered around a to-be constructed facility for disposing of mine waste known as tailings, the ground up waste rock left over after metals are removed from ore,” reported Jeremy Hsieh with Juneau Empire. “Coeur plans to dump the tailings into Lower Slate Lake and treat the water flowing out to Berners Bay; the environmental groups sought a wetland disposal option that would preserve the lake.”

The Empire report adds: “‘We still believe the (wetland) plan is best for Berners Bay, but we’re glad the Corps of Engineers made its decision quickly,’ said Lindsey Ketchel, executive director of the Southeast Alaska Conservation Council, one of the environmental groups involved in the lawsuit.”

Coeur Alaska’s permit extends through July, 2014.

“This is good news for an ailing southeast Alaska economy, and after 20 years of study and debate, Alaskans can finally go to work,” said Sen. Begich. “The mine will create hundreds of good-paying jobs for Alaskans and help expand the mining industry in a responsible way.”





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