The Sylvain/Langis showing is located approximately 32 kilometres northeast of Likely. Access to the area is from Likely, where one takes the Cariboo River road and Keithley Creek road north east for approximately 26 kilometres. At this point, the Harveys Creek forest service road (also known as the 9600 road) is taken north east for 10 kilometres.
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. The metasedimentary rocks consist mainly of marble, quartzite and phyllite, which in the area of the showing form part of the Downey succession. Metamorphism of the region varies from chlorite to sillimanite and higher grade. Mineral deposits of the region are generally confined to greenschist facies rocks.
The Sylvain/Langis showing, where outcrop is present, is underlain by limestone in which pyrite replacement has occurred over a width of 3 metres. A more highly mineralized central zone of approximately 10 per cent pyrite over a width of 30 centimetres contains low gold values.
In 1983, Harvey Creek Gold Placers completed a seismic survey along Harveys Creek, below the occurrence. In 1987, a geochemical program consisting of heavy sediment sampling using a one and a half inch suction dredge was carried out on the Harveys Creek and Simlock Creek drainages. 1988 and 1989, the Simlock Creek property was optioned to Logan Mines Ltd., who carried out a program of geochemical soil sampling, ground magnetic surveying and prospecting. A total of 1175 soil samples were taken at 100- metre line and 20 metre station spacings on a grid straddling the Simlock Creek drainage. A ground magnetic survey, totalling 18.6 line-kilometres, was conducted over the same grid. During 1990 through 1997, Harvey Creek Gold Placers completed programs of geological mapping and rock and soil sampling on the area as the HH claims. In 2004, Sydney Resource Corporation took a total of 286 soil samples and 50 rock samples and completed 1.7 kilometres of ground magnetic surveying. During 2009 through 2012, Barker Minerals completed programs of prospecting and soil and rock sampling on the area as the SL claims.
