The Amigo prospect is located approximately 2.25 kilometres southwest of Drybrough Peak, some 280 kilometres north of Smithers. The Amigo prospect lies within the Omineca-Cassiar mountains at the southern end of the Toodoggone gold camp. The prospect is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Takla Group andesite flows and pyroclastic rocks. Takla volcanics have been intruded by the granodiorite to quartz monzonite Black Lake Suite of Early Jurassic age and are in turn unconformably overlain by or faulted against Lower Jurassic calcalkaline volcanics of the Toodoggone Formation, Hazelton Group. The dominant structures in the area are steeply dipping faults which define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high angle northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Amigo prospect is underlain by the Early Jurassic Black Lake stock and a pendant of Asitka Group limestone, chlorite schists and andesitic volcanics. The composition of the Black Lake stock is quartz diorite to quartz monzonite in this area. The Permian limestone unit is at least 150 metres thick and varies from medium bedded (centimetre- scale) to very thickly bedded (metre-scale). One 1- to 2-metre-wide porphyritic quartz monzonite dike was observed nearby. The Amigo prospect consists of a number of mineralized skarn outcrops forming a northerly trending zone approximately 4000 metres long by 600 metres wide.

Traces of galena, tetrahedrite, chalcopyrite, sphalerite and malachite staining occur in the main skarn exposure located at the headwaters of a southwest-flowing creek. Skarn minerals associated with this prospect include variable amounts of garnet, diopside, wollastonite and calcite. The exposure has been mapped being approximately 800 metres long by 600 metres wide.

Rock sample JCC-R-419 from this exposed skarn zone was assayed in 1978 with the following results: 178.0 grams per tonne silver, 3.73 per cent zinc, 3.25 per cent copper and 0.0236 per cent lead (Assessment Report 6762). In 1982, a sample taken from nearby yielded assay values of up to 68.57 grams per tonne and less than 0.343 gram per tonne gold (Assessment Report 11106). Other samples from skarn exposures comprising the Amigo prospect yielded up to 51.43 grams per tonne silver and less than 0.343 gram per tonne gold (Assessment Report 11106).

Work History

The area has been explored in conjunction with the nearby Pul 1 (MINFILE 094E 137) occurrence and a completed exploration history can be found there.