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Just ran across this video of the Anaconda Smoke Stake that was an icon in Great Falls, where we lived in the mid-late 70's. AS the accompanying article states, you could see this stack from many miles away. It really was an iconic landmark and it's a shame they demolished it. When I was taking flying lessons, I used to fly over the stack just for fun.

The day the Anaconda Co. stack fell 34 years ago
Anaconda Co. smokestack in Black Eagle demolished 34 years ago
www.greatfallstribune.com