The area is underlain by diorite of the Paleozoic and/or Mesozoic Westcoast Complex. The diorite is in contact along irregular boundaries with crystalline limestone of the Upper Triassic Quatsino Formation, Vancouver Group. In places the limestone is cut by tongues of diorite, which have locally been altered to nearly solid garnet.

The Tally showings occur on the steep north slope of a mountain at about 600 to 800 metres elevation, just above Harris Creek. Considerable magnetite float occurs along the hillside, and in some cases, blocks of solid magnetite up to 60 or 90 centimetres in the longest dimension were found. Magnetite mixed with garnet, epidote and some pyrite is exposed on a face 3 metres high and 3 metres long, underlying limestone. The magnetite found as float was of much better grade than that found in place.

Samples assayed up 1.5 per cent copper, 0.5 per cent cobalt and 17.14 grams per tonne silver; pit samples graded up to 3.5 per cent copper (Property File - Mineral Deposit Inventory Card).