The Caribou Ace showings are reported (Minister of Mines Annual Report 1930, page 262) to be located 3.2 kilometres west of the Millie Mack property (082KSW051), approximately 10 kilometres northeast of Burton.
This area is underlain by east trending metasedimentary rocks (mainly argillites) and mafic volcanic rocks of the Triassic Slocan Group. Quartz monzonite of the Cretaceous Goat Canyon-Halifax Creek stock outcrops south of the area.
Surface prospecting has been undertaken "on quartz veins carrying gold" (Minister of Mines Annual Report 1930, page 262).