The Lone Star showing is located on the west bank of Pangea Creek, a tributary of Mudflat Creek on the northeast side of the Rocher Deboule Mountain Range, 10 kilometres south-southeast of South Hazelton.

A pyrrhotite vein, up to 10 centimetres wide and less than 8 metres long, cuts greywacke, slate and argillite of the Middle Jurassic to Lower Cretaceous Bowser Lake Group. The vein has previously been explored by an adit which is now caved.

Dikes of porphyritic diorite intrude the sedimentary rocks in the area. Late Cretaceous porphyritic granodiorite of the Rocher Deboule stock intrude the Bowser Lake Group, 1.5 kilometres to the west. A north-trending block fault, the Pangea Fault, separates the sedimentary rocks from andesitic flows, breccias, tuffs and volcani- clastic sediments of the Upper Cretaceous Brian Boru Formation, Kasalka Group.