The JACK showing is located between West Lake and Islahtl Lake, approximately 21 kilometres northwest of Westbank.
The showing is a quartz-carbonate vein hosted in greenstone and andesite which may be part of the Triassic-Jurassic Nicola Group. The general area is underlain by arc clastic rocks of the Devonian- Triassic Harper Ranch Group.
The showing was discovered in 1989 by Rea Gold Corporation who funded a prospecting program for precious metals in this area. The quartz-carbonate vein is mineralized with pyrite and minor amounts of tetrahedrite. Assay results from samples of this mineralization include: 123.2 grams of silver per tonne, 0.0253 per cent antimony, and 0.0345 per cent arsenic (Assessment Report 19579). An adjacent sample assayed 0.0454 per cent copper (Assessment Report 19579).
A different Jack showing (082LSW118) occurs to the north on the southwest flank of Eileen Mtn. This showing is also a quartz vein and a sample assayed 2.79 grams per tonne gold (Assessment Report 19579).