The Sarah occurrence is located at the west end of Sarah cirque, approximately 110 kilometres northwest of the community of Germansen Landing.

The property is underlain by andesite and basalt flows of the Upper Triassic Takla Group (Plughat Mountain Formation) which are intruded by the Croydon Creek stock, a Jurassic or older intrusion possibly related to the Late Triassic to Early Cretaceous Hogem Intrusive Complex. The stock varies from hornblende to quartz diorite and from fine-grained to pegmatitic, and is in turn cut by late aplite and quartz feldspar porphyry dikes.

Pyrite, chalcopyrite, and malachite with very minor bornite coat fractures in the mafic intrusion and are disseminated in clots of hornblende and pyroxene. Most assays over more than a metre are less than 0.1 per cent copper, however, one 30-centimetre-wide vein assayed 5.28 per cent copper, 7.5 grams per tonne gold and 55.5 grams per tonne silver (Assessment Report 4565). Epidote and chlorite are the main alteration minerals associated with the mineralization.