 The two 1919 headframes, mirror images of each other, are unusual as a collaboration between mining engineers and a professional architect.In 1919, Cliffs Shaft engineers determined that the two wooden headframes atop their A and B shafts were deteriorating and would soon be unsafe.When Cliffs Shaft engineers presented company president William G. Mather with proposals to update the headframes, Mather suggested that, because of the prominence of their location, the headframes combine practicality with architectural beauty.