 Utah Copper and Boston Consolidated merged after their separate surface operations approached each other in 1906.The Kennecott Copper Corporation, established to operate mines in Kennecott, Alaska, purchased a 25 percent financial interest in Utah Copper in 1915, which they increased to 75 percent in 1923.Bingham's Canyon mine expanded rapidly, and by the 1920s the region was a beehive of activity.