The Marisa 1 occurrence is located on an east-flowing tributary of the Quatse River, approximately 2.5 kilometres northeast of the northeastern end of Quatse Lake.

Regionally, the area is underlain by northwest-trending belts of basaltic volcanics and carbonate sedimentary rocks of the Upper Triassic Karmutsen and Quatsino formations (Vancouver Group) and mafic volcanics and sediments of the Upper Triassic to Lower Jurassic Bonanza Group (Holberg volcanic unit, Nahwitti River wacke and Parson Bay Formation). These volcanic and sedimentary rocks have been intruded by granodioritic rocks of the Early to Middle Jurassic Island Plutonic Suite.

Locally, fracture filling and disseminated chalcopyrite with traces of molybdenite is hosted by a fine-grained quartz diorite. Magnetite mineralization is associated with mafic clots. The quart diorite has undergone weak argillic and/or sericitic alteration. The mineralization can be traced in outcrops along a stream bed for approximately 450 metres.

In 1991, a sample (60768) assayed 0.028 per cent molybdenum, 0.445 per cent copper and 3.5 grams per tonne silver (Assessment Report 21581).

In 1992, a drillhole (M92-1) intercepted 16.17 metres averaging 0.17 per cent copper (Assessment Report 22243).

A second zone of mineralization, located approximately 1 kilometre to the northwest, contains minor chalcopyrite, bornite and pyrite in shears cutting the intrusive rocks. In 1991, a sample (60714) assayed 0.222 per cent copper and 1.0 gram per tonne silver (Assessment Report 21581).

Another zone of mineralization, located to the southeast of the main zone, comprises disseminated chalcopyrite in a diorite. In 1991, a sample (60747) assayed 0.597 per cent copper, 0.153 per cent zinc and 4.3 grams per tonne silver (Assessment Report 21581).

In 1968, Brett Explorations soil sampled the area as the Gub and Tab claims. In 1968 and 1969, Tro-Buttle Exploration Ltd. completed a program of soil sampling, geological mapping and ground magnetic surveys on the GB claims. In 1991, Daiwan Engineering Ltd. prospected and sampled the area as the Marisa 1-4 claims. The following year, a program of geochemical sampling, ground induced polarization and magnetic surveys and five diamond drill holes, totalling 376.4 metres, were completed on the area.