Penitenitiary Mountain is located in Northeastern Shelby County. It is just EAST of and PARALLEL with County Road #43 between it's intersection with U.S. Highway #280 and the Community of Vandiver at the intersection of #43 and Highway #25. Sterrett is not far from Vandiver.
I hope that this is some help. There are goverment topo maps available. I believe that it is in the "Vandiver Quadrangle". These will show cemetery locations. You may also try www.topozone.com and be able to find a map that may be printed free