The region of the Tar showing area is underlain by the Jurassic Hazelton Group, dominated by intermediate flows and volcanic rocks of the Lower Jurassic Telkwa Formation, which is overlain or in fault contact with volcaniclastics of the Smithers Formation. The strata are intruded by a quartz diorite rock of the Late Cretaceous Bulkley Plutonic Suite.

The Tar showing area is more specifically underlain by massive to well-bedded flows, ash and lapilli welded tuff and bedded tuff. Massive units of variable thickness are thought to represent rhyolitic flow domes. In general it was reported that all mineralization found on the Tar claim was associated with quartz veins, quartz stringers and stockworks hosted in argillically altered volcanic rock. Veins varied from 2 centimetres width to 2 metres. Most veins sampled were reported to be sulphide poor, with some minor sulphides consisting of pyrite and chalcopyrite.

Quartz vein samples from the northeast corner of the Tar claim gave gold values of up to 1.44 grams per tonne gold and up to 3.38 per cent arsenic (Assessment Report 21720). Silver values were low. The samples at this location were described as a quartz vein, at least 40 centimetres in width.

Mineralization on the Tar region was discovered in 1981 by Pat Suratt and the reader is pointed to the MINFILE Cummins Veins prospect (093E 100) for details of the area work history. The Tar and Jesse claims were part of the Cummins claim group in the 1980s to early 1990s. In 1991 two prospectors collected 37 rock samples and 5 gold-pan concentrates in the Tar and Jesse areas which led to the recent documentation the two showings.