This is a great shot of the "Jack Post" that drillers used underground.
Notice the "shims" on the ceiling?  The two large bolts at the bottom were tightened to raise the whole
thing and make it stationary for drilling.  Notice the wrench on the right.

Continental Mine, J. P. Munday, Shoveler, R. Dowling, and I. L. Troutman, Machinemen, and
J. Golibart, Ground Boss