The Shoulder occurrence consists of two parallel quartz veins, hosted in chloritized mafic volcanics, about 2 metres apart. The veins trend northeast and dip 55 to 60 degrees to the southeast. The smaller, 5 centimetre wide vein contains up to 50 per cent sulphides consisting of pyrite, galena, stibnite, and trace sphalerite. The second vein is thirty centimetres wide and consists of massive white quartz with 4 per cent euhedral pyrite and a trace of chalcopyrite. One grab sample yielded 15.26 grams per tonne gold, 128.23 grams per tonne silver, 5.53 per cent zinc and 0.24 per cent lead (Assessment Report 20655). Further veining was reported to have been encountered in follow-up work. The area is regionally mapped as being underlain by a Mississippian unit of undivided volcanic rock of the Stikine Assemblage.
The Shoulder Vein was discovered in 1990 by Homestake Minerals who followed up with detailed geologic mapping around the vein in 1991. In 1994, North American Metals Corp completed grid-work, mapping, geophysics and sampling on the Shoulder grid to the south of the Shoulder Vein. Please refer to Nie (104K 081) for details of a common geology and work history.