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White Earth’s LaDuke is among those protesting pipeline in Superior, Wis.

Indian horseback riders launched a protest in the shadow of Enbridge Energy’s Superior, Wis., refinery Sunday against the company’s proposed Alberta Clipper Pipeline.

If approved and constructed, the pipeline would become North America’s largest conduit for bitumen from Alberta’s tar sand formations.

The project would boost the capacity of an existing line from 450,000 to 570,000 barrels per day.

Yet Anishinaabe protestors expressed concerns about potential damage the new line could cause, citing a 2012 50,000-gallon spill from an Enbridge line in Grand Marsh, Wis., and an 843,000-gallon spill into Michigan’s Kalamazoo River in 2010.

“Enbridge should clean up its old mess before it tries to make a new one,” Winona LaDuke, executive director of Honor the Earth, the group engaged in the protest, said in a statement.

A nationally known American Indian activist, LaDuke was one of the riders.

The Minnesota Public Utilities Commission is deliberating Enbridge’s petition for a certificate of need for the project.