The Caledonia occurrence is located on the north side of the Kashutl River, approximately 3 kilometres north west of the river mouth.

The area is underlain by Lower Jurassic Bonanza Group volcanics which are intruded by granodiorite of the Late Jurassic Island Plutonic Suite.

At the occurrence, west striking, 5 to 15 degrees north dipping andesite is interbedded with two limestone beds, separated by 50 metres of barren, epidote-altered andesite. Diorite of the Island Plutonic Suite outcrops 500 metres to the west as well as 400 metres east. Minor faulting, with offsets to 6 metres, is present. Mineralization occurs in the limestone units. The lower unit which is 1.5 metres thick, contains magnetite with traces of chalcopyrite. The upper limestone unit is 3 metres thick and has been traced for 50 metres along its length. Mineralization consists of chalcopyrite, magnetite and hematite in a gangue of garnet, epidote, quartz and calcite. Traces of bornite, malachite and azurite are reported.

In 1920, copper assays from 3 open cuts returned values between 0.5 and 4.0 per cent (Minister of Mines Annual Report 1920, page N202).

In 1962, Rio Tinto completed a program of soil sampling, geological mapping and ground magnetometer survey on the area. In 1969, Vargas Mines completed a program of soil sampling and geological mapping on the area as the Kas claims.