BIG BAY -- An environmental group is walking across the Upper Peninsula to warn residents about the dangers that sulfide mining can pose to fresh water.

The group started in Eagle Rock and is planning to cover 15 miles a day, while stopping along the way to hold rallies.

"It's throughout the Great Lakes, and as people wake up and realize, hey, we're running out of clean, potent water sources, they will turn to the Great Lakes," said Margaret Comfort, the organizer of the walk.

Environmentalists and other groups have spent the last few years voicing opposition to a proposed sulfide mine in Marquette County, to be built by Kennecott Minerals.  Kennecott, which claims the mine will pose no danger to the environment, is still seeking final approval by the state to build the mine.

The walkers expect to arrive in Marquette on Wednesday and they'll hold a rally there on Thursday.

Their final destination will be the Mackinac Bridge.