The Sylvain showing area is on the west side of Cariboo Lake, just north of Pine Creek, about 26 kilometres northeast of Likely. Access is from Likely along the Keithley Creek road, then the Harveys Creek Forest Service Road (9600 road).

The region is underlain by Snowshoe Group rocks of the Barkerville Terrane. Mapped as undifferentiated Snowshoe Group (Geological Survey of Canada Map 1638A), it is probable that the Sylvain showing is underlain by the Lower Paleozoic Downey succession. Lithologies underlying the showing include limestone, phyllite, quartzite and other metasediments. Quartz veins, up to about 4.5 metres wide, contain pyrite (in places oxidized) and gold.