The Mast showing is located 4.5 kilometres southeast of Nakinilerak Lake, northeast of Babine Lake.
The area is underlain by andesitic volcanic rocks of the Lower Jurassic Telkwa Formation (Hazelton Group), cut by small diorite bodies of the Eocene Babine Intrusions.
Disseminated pyrite with minor chalcopyrite is reported to occur in silicified andesitic volcanic rocks and small diorite intrusions (Geology, Exploration and Mining 1971, page 185).
Work History
The area has been explored in conjunction with the nearby Dorothy (MINFILE 093M 009) occurrence and a complete exploration history for the area can be found there.