The Mac showing is located about 25 kilometres northeast of Dease Lake.

Massive sulphide occurs between the contacts of granodiorite/quartz monzonite to the north, steeply dipping limestone/marble to the east and anorthosite to the west(?) and south. The intrusive rock is probably related to the Late Cretaceous Little Eagle pluton. The limestone/marble, metaquartzite and gneiss mapped at the Mac showing are probably part of the Mississippian to Triassic Kedahda Formation of the Cache Creek Complex (Assessment Report 1105, Figure 1; Geological Survey of Canada Open File 2779).

The Mac showing is about 9 metres in diameter and consists of a small dome composed mainly of pyrrhotite, chalcopyrite, pyrite and minor quartz and barite. The contact zone is characterized by a talcose mineral and malachite staining. The surface of the showing is highly gossanized. Several years later when the Eagle claims covered some of the same ground, scheelite was added to the list of minerals observed (Exploration in British Columbia 1976, page 193).

A sample across 9.8 metres ranged from 0.03 to 1.33 per cent copper (averaging 0.73 per cent), 0.02 to 0.04 per cent nickel (averaging 0.03 per cent) and 13.6 to 50.2 iron (averaging 40.2 per cent) (Assessment Report 1105).

An unknown amount of mapping and sampling on the Mac claims was done in 1967 by K. Willison. This was followed by electromagnetic and soil surveys in 1969 by Jupiter Explorations Ltd. Noranda held some of the same ground in 1976 as the Eagle claim, conducting geological, magnetic and soil surveys.