Host rocks of the Tag showing are weakly metamorphosed sedi- mentary sequences assigned an Upper Triassic age based on recent fossil evidence (Gunning, M.H., 1986). These rocks are now believed to be correlative with the Stuhini Group (Personal Communication, D.J. Alldrick, Jan. 1989).

Two small showings in McTagg Creek valley were originally recorded by Newmont Exploration Ltd. One consists of copper staining (malachite?) associated with quartz-sericitic and siliceous alteration, including jasper and pyrite, of argillaceous phyllite. The other consists of pyritiferous quartz stringers along fractures in similar rock (Newmont Map).

Later work by True North Minerals outlined a north trending alteration zone (Zone 4), within argillitic rock, composed of up to 30 per cent sulphides, mainly pyrite. The altered argillites are cut by quartz veins. Chalcopyrite was reported at one location. The highest assay came from a rusty quartz vein hosting fine-grained pyrite and contained 0.071 grams per tonne gold and 8.4 grams per tonne silver across a width of 10 centimetres. An average value of 14 samples taken is 0.017 grams per tonne gold and 2.1 grams per tonne silver (Assessment Report 17087).

In 1986 and 1987, Hi-Tec Resource Management Limited outlined a gold soil anomaly near the toe of the east McTagg glacier (Unuk 3 and 4 claims) but had no success in pin pointing the source. The McTagg River Valley is a freshly glaciated, steep-sided one with difficult access. It cuts across a moderately well-folded and faulted sequence of argillites, carbonates and occasional intercalations of felsic tuffs.

During the 1989 field season of Granges Inc, a moderate amount of success was achieved in tracing the gold soil anomaly up the east wall of the valley. They found that the anomalous soil values may be related to copper bearing shears in the sedimentary rocks on the east wall.

See AP (MINFILE 104B 083) for details of a common property work history.