| The Aberdeen mine is located immediately west of Broom Creek approximately 2 kilometres northwest of its confluence with Guichon Creek. The area is underlain by rocks of the Lower Jurassic Guichon Creek batholith which are covered for the most part by extensive glacial overburden. Near the mine, Broom Creek parallels the contact between two varieties of the older Highland Valley phase of the Guichon Creek batholith. To the west is the Chataway granodiorite (190 Ma +/- 8 Ma). To the east, rocks previously designated by Northcote (1969) as fine-grained granodiorite belonging to the Witches Brook phase (199 Ma +/- 8 Ma) have been remapped by McMillan (1978) as quartz monzodiorite of the older Guichon variety. The Aberdeen deposit lies along a mass of greenstone between two coarse joint planes striking 300 degrees in the plutonic rocks. A series of high-grade, en echelon lenses, striking 310 degrees and dipping steeply to the northeast, occur in a fracture zone to a depth of 30 metres. Mineralization consists of chalcocite, specularite, minor native copper, chalcopyrite, pyrite and bornite in a gangue of tourmaline, quartz and hematite. Malachite staining is also present. The mine was developed by a vertical shaft from which levels have been run at depths of 15.2, 30.5, 45.7 and 61 metres. Several of these drifts are stated to be 125 metres long."
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