The property is located on Burnaby Island, Queen Charlotte Islands. The showings on the Mac No. 1 claim outcrop between elevations of 61 and 122 metres on the north side of an easterly flowing stream 5.2 kilometres southwest of Scudder Point.

The showings were discovered by A. Hino in about 1906 but little exploration work was done other than a dip-needle survey.

Merrican International Mines Ltd. acquired the Mac group of 12 claims in 1962 and subsequently expanded the property to 57 claims. Work by the company during 1963-1964 included a ground magnetometer survey, trenching, 11 X-ray drill holes totalling 364 metres and 16 EX diamond drill holes totalling 1678 metres.

The company has stated possible reserves of 1,360,778 tonnes, grading between 40 and 50 per cent iron (George Cross Newsletter No. 102, 1964). Considering the drilling pattern which was largely enforced by topography, and the resulting acute intersections of strata and ore, the results would require caution in interpretation (Brown, 1968).

The area is underlain by limestone of the Upper Triassic Sadler Formation (Kunga Group) and greenstone of the Vancouver Group, Upper Triassic Karmutsen Formation. Both are intruded by monzonitic stocks of the Middle to Late Jurassic Burnaby Island Plutonic Suite. The stratified rocks strike 045 to 060 degrees and dip 35 to 55 degrees northwest. Fine-grained basic dikes and sills cut the limestone.

A concordant body of magnetite occurs as a replacement at the limestone and greenstone contact. The body is about 75 metres long and varies in thickness from 1.5 metres at the west to 7.6 metres at the east, where it abuts against a greenstone dike. A steeply dipping northwest fault cuts the magnetite zone, offsetting the east half 25 metres to the northwest. The main showing is almost pure magnetite with rare garnet crystals. Other skarn minerals or sulphides are seemingly absent in the ore.

Diamond drilling encountered magnetite with a downward extension of 45 metres. An average assay for mineralized sections gave 49 per cent iron. Inferred reserves are 1,360,800 tonnes grading between 40 to 50 per cent iron (George Cross Newsletter No.102, 1964).