The Border showing is located adjacent to the International Boundary on the Salmon River road in southeastern Alaska, United States.

Located in the Intermontane Belt, the area, bounded on the west by the Coast Crystalline Complex and on the east by the Bowser Basin, is part of the Stikinia Terrane.

The showing is hosted by the Upper Triassic to Lower Jurassic Hazelton Group Unuk River Formation metavolcanics. The Hazelton Group is a northwest trending, steeply east dipping belt of folded andesitic lapilli tuffs, flows and breccia containing a thick sequence of argillite and siltstone infolded along a synclinal axis. The sequence is intruded by the Early Jurassic Texas Creek plutonic suite of dacitic porphyry dykes and sills, Eocene granitic Hyder intrusives and lamprophyre dykes.

A 21.0 metre adit has been driven between two porphyry dykes in a mineralized fissure zone. Mineralization consists of galena, sphal- erite, pyrite and a little chalcopyrite with associated calcite in shoots up to 15.0 centimetres wide. Sulphides occur in scattered veinlets and narrow stringers of quartz in a wide zone of gash vein- lets.