The Mollie Kathleen Gold Mine is a historic vertical shaft mine near Cripple Creek, Colorado, United States.[1] The mine shaft descends 1,000 feet (300 m) into the mountain, a depth roughly equal to the height of the Empire State Building in New York City.[2] The mine currently gives tours,[3] and is visited by around 40,000 people annually.[4] The addition of the mines and subsequent tours of this mine and others in the area had considerable effect on the economies of both Victor and Cripple Creek.[5][6][7]