A considerable area of south-central British Columbia is underlain by Miocene plateau basalt, largely confined to the area between the Pinchi-Fraser fault system to the east and the Yalakom fault system to the west. However, remnants of the plateau basalt occur in Quesnellia. One of these remnants outcrops in the Moffat Creek area and is known as the Moffat or Falls showing.
The showing is situated about 5 kilometres south-southwest of the village of Horsefly. Best access is from Horsefly via the 108 Road southwesterly to Gammarus Lake or via the Starlike Lake Road. The roads are good, all-weather gravel roads used primarily by local ranchers and the forest industry. Numerous tote and skid roads provide excellent secondary access.
The majority of the showing area is covered with a heavy mantle of glacial till and glaciofluvial silt deposits. Bedrock exposed in Moffat Creek canyon consists of Lower Jurassic porphyritic (augite?) basalt of the Nicola Group. Younger Miocene flood basalts overlie the Jurassic volcanics.
Minor amounts of copper sulphide (chalcopyrite) and native copper occur within the plateau basalt. This showing is one of three copper occurrences recorded in the area, the others are the Red occurrence (093A 064) about 1.45 kilometres to the northwest, and the polymetallic Stope Baby showing in Moffat Creek canyon, 500 metres to the northwest.