The Mount Priestly showing is located to the northeast of the Snafu (103P 232) and Kay (103P 225) showings, somewhere near the peak on Mount Priestly about 13 kilometres east of New Aiyansh (Bulletin 64).
The area is underlain by Middle Jurassic to Upper Cretaceous sedimentary rocks of the Bowser Lake Group. These sediments are intruded by a granitic stock of the Eocene Coast Plutonic Complex. Light grey, medium grained, equigranular quartz diorites near the peak of the mountain contain some disseminated molybdenite in fractures.