The geology of the region consists of (?)Hadrynian to Paleozoic Snowshoe Group rocks. The Snowshoe Group is an assemblage of dominantly metasedimentary rocks within the Barkerville Terrane. These metasedimentary rocks comprise mainly marble, quartzite and phyllite which, in this area, are mainly undifferentiated. Metamorphism of the region varies from chlorite to sillimanite facies and higher, but most of the mineralization in the region is confined to those areas metamorphosed no higher than greenschist grade.
The Stockwork or Crystal showing consists of a group of quartz veins at an elevation of about 1783 metres, about 914 metres north of the Jim adit (093A 037) and about 853 metres south of the Cornish Ledges (093A 100). In 1938, claims were located on ground covered by the Crystal group by Lieut.-Col. F.H.M. Codville, of Duncan.
The veins are in grey quartzite of the Snowshoe Group and occupy an area about 28 sqaure metres just west of the western contact of a narrow band of black silty quartzite. The vein area is on the western flank of a northeasterly dipping anticlinal septum of the black silty quartzites. The veins are exposed in shallow surface workings and natural outcrops. They are in rocks striking about 330 degrees and dipping gently northeast. Lineation in the black quartzites just east of the vein area plunges 15 degrees to the northwest.
The quartz veins occupy several sets of fractures. The most prominent fracture direction strikes about 050 degrees, and less conspicuous fracture directions strike about 025 degrees and due east. Vein quartz parallel to the schistosity of the rocks joins the northeasterly striking veins and in so doing tends to form a rather complex pattern. Some of the veins attain a width of 3.6 metres and several are 0.9 to 1.8 metres wide. The amount of quartz in this small area is quite impressive. However, in most exposures the quartz is barren or only sparsely mineralized. One vein near the western side of the area is well mineralized with galena, sphalerite, and pyrite and in 1954 three samples of selected material was taken. One containing galena and no pyrite or sphalerite assayed 0.28 gram per tonne gold, 221.1 grams per tonne silver and 20.5 per cent lead. One containing sphalerite and some pyrite but no galena assayed 0.28 gram per tonne gold, 2.8 grams per tonne silver and 1.3 per cent zinc. One containing about 20 per cent pyrite and no galena or sphalerite assayed nil gold (Bulletin 34).
