Alberta government knew bighorn sheep contaminated with coal mine selenium: scientist

An Alberta Environment spokesman said the government is aware of the issue.

“Alberta Environment and Parks has engaged with researchers and mining companies and their consultants in the (area) regarding selenium levels in bighorn sheep,” said John Muir in an email.

Kneteman’s work dates from 2015. It was his thesis for a master’s degree and not provincially funded.

He was investigating selenium, a naturally occurring element associated with coal mines that is healthy in small doses but toxic in excess. Kneteman’s study looked at what levels of selenium were normal for animals, including bighorns, deer, elk and caribou, by considering 85 different herds from across North America.

Two herds in northwest Alberta stood out — those on the sites of the Smoky River, Gregg River and Luscar coal mines.

“(Levels in) bighorn that occupied coal mines were miles away from everybody,” he said.

Both herds averaged well outside the safe range for selenium. One of them almost doubled that level.

“They’re getting it from the coal mines,” Kneteman said. “We found no evidence of elevated selenium in Alberta in any of the other populations that we sampled.”

The Rockies are naturally low in selenium. As well, when bighorns from one of the coal-affected herds were transferred to Nevada, their selenium levels dropped to normal within a year.

Muir said a consultant found selenium levels to be high but below those that would produce toxic effects.

Selenium is known to damage reproduction. That effect was present, said Kneteman.

“The sheep on the mines have the lowest reproductive potential and reproductive output that we’ve ever measured in Canada.”

The province’s 2015 draft management plan for bighorns found that the ratio of lambs to ewes was lower at coal mines than native range every year from 2008 to 2013.

Referring to unpublished government data, that plan says: “High selenium levels in blood samples from bighorns feeding in reclamation areas associated with a coal-mine site … are of concern to sheep managers.

“No examination of possible population effects attributed exclusively to selenium toxicity has been undertaken to date.”

Research suggests selenium is widespread in the ecosystem in question.

Kneteman previously found elevated levels in dippers, small birds that feed on aquatic insects. Other studies have found excessive selenium in at least three area waterways.

“(Selenium) is throughout the system,” Kneteman said.

Although his data is years old, there’s little reason to believe things have improved, he said.

“(Selenium) hasn’t declined at all since the first measurements in the late ’90s,” he said.

“The assumption could be made it’s the same today as it was in 2015. Why would we expect it to have changed?”

The province’s 2019 five-year monitoring plan mothballed all the area’s water-monitoring stations.

Since last spring, Alberta has sold tens of thousands of hectares of exploration leases for new coal mines along the summits and eastern slopes of the Rockies.

In response to public concern, Energy Minister Sonya Savage has paused all work on the most sensitive landscapes, stopped further lease sales and struck a panel to hear concerns from Albertans.

She has asked Albertans to have faith in the province’s regulatory agency and monitoring programs and has referred to Alberta Environment’s “stringent environmental protections.”

Muir said the province is monitoring selenium levels in wildlife, fisheries, soil and vegetation.

Kneteman said he tried repeatedly to get his former department to study a toxin from resource development contaminating the animal that is supposed to symbolize the province.

“No one’s made any measurements, which is maybe dereliction,” he said.

“The only reason we’ve got any measurements is that I went and got them. There wasn’t any effort to find out what was going on.”

This report by The Canadian Press was first published May 11, 2021.

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Bob Weber, The Canadian Press

by The Canadian Press

Alberta government knew bighorn sheep contaminated with coal mine selenium: scientist

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