The Fly Geyser was accidentally created in 1916 during the drilling of a well. Dissolved minerals started rising and piling up, creating the mount on which the geyser sits, which is still growing to date. Today, water is constantly squirting out reaching 5 feet (1.5 m) in the air and coloring the cone with minerals.
http://en.wikipedia.org/wiki/Fly_Geyser