Ventilating Tower

A ventilating tower for one of the copper mines in Butte - see this photo (http://www.flickr.com/photos/7230309@N05/3815368293/sizes/o/in/set-72157622023674752/) for the plaque along the trail. On the plaque, the image on the left shows the tower at the very top compared to the rest of the mine.

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