The Boras Headframe was the last wooden headframe built in the Warren Mining District near Bisbee, Arizona. Erected in 1917, it hoisted over 50,000 tons of copper ore by 1926, when the mine closed during the Depression. Production resumed in 1938 and continued to 1944. In 1952, the headframe was reconditioned and some wood supports were replaced with steel. Until 1975, it served as a ventilation and escape shaft for the interconnecting underground workings of the Dallas and Cole mines. The shaft it served was 1,034 feet deep, and the hoist's General Electric motor was rated at 52 horsepower at 550 rpm, with a maximum speed of 1,200 feet per minute. Its relocation to Phoenix was completed in 1998.