In 1988, extensive upgrading and straightening of Highway 97 approximately 126 kilometres east of the community Atlin resulted in a number of new roadcut exposures and some extensive outcrop in burrow pits.
In one new exposure, about 3.5 kilometres west of Swan Lake, a 3-metre wide gossanous zone occurs within a greenstone unit of the Paleozoic Big Salmon Complex. Several north-northwest trending quartz-chlorite-magnetite-pyrite-chalcopyrite veins cut the zone. The veins attain a maximum thickness of 30 centimetres. There is no sign of this zone having been previously sampled. Mineralized chips collected across a 1.5 metre true thickness that is 80 per cent vein material assayed 0.2 per cent copper, 165 parts per million cobalt, 210 parts per million arsenic and 45 parts per million tungsten (Fieldwork 1997, page 6-18).