The Tan showing is located 24 kilometres southeast of Port Alberni, slightly east of the B&K (092F 081) and Golden Eagle (092F 080) occurrences.

The area, located in the Cowichan uplift, is underlain by volcanics and minor sediments of the Upper Devonian McLaughlin Ridge Formation (formerly the Myra Formation) and the Devonian Nitinat Formation, both of the Sicker Group. Diorite of the Early to Middle Jurassic Island Plutonic Suite occurs to the south.

The showing occurs in basaltic pyroclastics of the McLaughlin Ridge Formation which comprised of tuff, agglomerate, flows with minor interbedded chert and argillite. A quartz-sulphide mineralized shear zone strikes 150 degrees and dips 45 degrees east. The zone has been traced along strike for 70 metres and is 1.8 metres wide. The sulphides, with the exception of pyrite, have not been specified. A grab sample from a trench (#1) on the shear zone assayed 0.06 grams per tonne gold, 2.1 grams per tonne silver, 0.05 per cent molybdenum, 0.01 per cent copper, 0.16 per cent arsenic and 33.39 per cent iron (Assessment Report 16072).