55 Years Ago
The July 13, 1970 Golden Transcript reported that the Coors smokestack was being demolished. The 180 foot tall smokestack was built in 1925. The article explains that the stack had been used with a coal boiler. The Clean Air Act became law in 1967, and Coors had switched to gas and oil boilers, to clean up their emissions.

From the article:
All of this is part of Coors recognition for the need to control air pollution. Remember how the black smoke used to waft over the Table Mountains, down the valley towards Wheat Ridge or up the valley over Golden?
The presence (or absence) of the smokestack is one item that I use to help establish dates for pictures of Coors.