The AB showing is located in outcrop 7 kilometres north of Spences Bridge on a ridge of the locally named Log-back Hill.

The area is underlain by Carboniferous-Jurassic Cache Creek Complex (Group) rocks in fault contact with Middle and Upper Cretaceous Spences Bridge Group volcanics.

Finely disseminated pyrite with occasional specks of chalcopyrite occur in weakly chlorite and epidote altered intermediate volcanics.