This is the Bucyrus-Erie 950b Shovel, built in Seelyville Indiana in 1936. At that time, it was the world's largest shovel and even made it into a 1936 issue of Popular Mechanics Magazine. The shovel was eventually disassembled and moved to Alberta, Canada. It was retired and scrapped in about 1990 after a long and prosperous career. One of it's buckets still remains on display at an outdoor mining exhibit near Forestburg, Alberta. I am fortunate enough to have photos of my great-grandfather standing on the staircase of this machine in the 1940s. (He lived nearby Seelyville, IN and apparently new one of the operators) RIP Binkley 950b!