Commonly called a gallows (note the resemblance), the head frame consists of the wheel, timbers, & braces necessary to support the weight of the cable and miners, or a loaded ore car, being hoisted to the surface of the mine. In deeper mines, the enormous weight of loaded ore cars, plus the heavy cable necessary to reach the bottom of the shaft, ruled out smaller frames such as this one and led to the development of huge metal head frames. Many of the larger mine shafts were over a mile deep.