The Jack showing is located 6.5 kilometres southeast of Pyramid Mountain in the headwaters of 4 Barrell Creek, 2 kilometres northeast of the Talc Lake deposit (092ISW063) (Assessment Report 23081).
Significant talc occurrences were first reported in this area in the early 1950s by Geological Survey of Canada geologists. In 1973, talc was first reported in the Talc Lake prospect area by J.A. Chamberlain Consultants while conducting surveys for nickel, chromite and talc. Low grade nickel (0.2 per cent) was identified over a wide area and a zone of talc-magnesite mineralization was outlined. The zone is now referred to as the Talc Lake deposit (092ISW063). Between 1986 and 1988, 3000 hectares of ground was staked to cover potential talc (magnesite) lenses. In 1989 and 1990, Highland Talc Minerals Ltd. began systematic geological mapping of the Talc Lake deposit. Late in 1990, a second talc zone referred to as the South Talc deposit (092ISW064) was defined. Four exploratory drillholes were completed in 1990. Between 1991 and 1992, detailed geological surveys, surface stripping, and four follow-up drillholes were completed. In 1992, the North Talc deposit (092ISW102) and 5 smaller satellite lenses were discovered. In 1993, a 100-kilogram bulk sample was taken from the South Talc deposit and a 120-tonne bulk sample was taken from the North Talc deposit shipped to Finland for Pilot Scale tests. In 1994, an additional 10 drillholes were completed on the South Talc deposit. In 1992, the area to the northwest was staked as the Jack claims by Pacific Talc Ltd. Prospecting was carried out in 1993 to determine the extent of talc mineralization.
The area is underlain by phyllite, schist and foliated greenstone of the Permian(?) to Lower Cretaceous Bridge River Complex (Group) and by phyllite, schist and local conglomerate of the Upper Jurassic to Lower Cretaceous Relay Mountain Group. Pods of serpentinized ultramafics of the Bridge River Complex occur in fault and normal contact with both units. All units are intruded by stocks of Late Cretaceous quartz monzonite and granodiorite.
The Bridge River Complex and Relay Mountain Group are separated along the ridge by an intervening fault-bounded mass of serpentinite striking northwest for 5.9 kilometres, generally following the crest of the ridge, and varying up to 900 metres in width. The ultramafic rock is dark green to black and weathers buff to reddish brown. The serpentinite consists of fine grained, massive serpentine with minor carbonate and 5 per cent magnetite.
At the showing, the main rock type is medium to dark green-grey phyllite, striking north to northwest and dip vertically. The phyllite hosts the talc mineralization, which is platy and light to dark green, weathering buff to brown. Variable amounts of chlorite are also present.
Nine grab samples were collected along a talc outcrop along 10- metre intervals, along a logging road in 1993. Analysis of these samples are not available.
