The Bragg Lake occurrence is underlain by well-layered volcanic rocks of the Lower Jurassic Telkwa Formation (Hazelton Group). Reddish brown coloured basalts are the most abundant rock type and comprise massive flows, breccia, tuffs and fragmentals. Three areas have been identified within the central part of the property which contain copper mineralization.

Chalcopyrite-pyrite-malachite mineralization has been observed as fracture fillings and as veinlets in porphyritic and fragmental andesitic outcrops in the vicinity of Bragg Lake. This mineralization appears to be localized and restricted in size but prospectors have reported some signs of copper mineralization occurring in similar rocks lying proximal to the southwest.

Refer to Herd Dome (093L 177) for related property details and work history.