Redstone, Colorado. Per the interpretive sign: Active 1890s-1908. Coal was brought 12 miles down a steep narrow-gage line, and the finished coke shipped to Pueblo, CO by standard gage. The sign also states that "present" mining operations were begun in 1956 by Mid-Continent Coal & Coke Company, but I don't know if mining is still going on. At any rate coke is no longer being made! Insert shows one of the ovens with the front wall still in place.