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“(Moose Lake) is now under imminent threat from industrial activity that has been or will be approved by Alberta.”

The provincial government did not immediately respond to a request for comment.

The alleged threat comes from an approval granted last June by the province’s energy regulator for an oilsands project that would come within two kilometres of Moose Lake. Prosper Petroleum’s $440-million, 10,000-barrel-a-day plans were vigorously opposed by Fort McKay at the time.

The green light came despite a provincial draft plan — the result of 15 years of talks under several different governments — to give the area some protection.

That plan contemplated a 10-kilometre zone around Moose and Namur lakes with safeguards for protecting Fort McKay’s land use. It would have established access control, environmental monitoring and thresholds for the surrounding region.

The Alberta Energy Regulator said at the time that it had taken into account social and economic issues, as well as impacts on treaty rights.

However, the regulator said it couldn’t weigh the approval’s effect on the province’s plan for the lake area because that plan was still being discussed and hadn’t been implemented.

The lawsuit asks the court to overturn permits for industrial activity within the 10-kilometre zone. It also asks the court to forbid Alberta from authorizing any more activity in the area unless Fort McKay agrees to it.

“Alberta has failed to … protect the Moose Lake area from the impacts of industrial development,” the statement of claim says. “Alberta will continue, unless restrained from doing so, to undertake or approve industrial development within the Moose Lake area.”

Prosper Petroleum has said it is committed to addressing its neighbours’ concerns.

The company would use steam injected into shallow horizontal wells to melt heavy, sticky bitumen crude and allow it to drip into a parallel well before being pumped to the surface, where it would be transported by truck to a buyer or pipeline.

— Follow Bob Weber on Twitter at @row1960