The Spur West occurrence is located at an elevation of approximately 1850 metres on a north-facing slope, approximately 3.7 kilometres south of Mount Gordonia.

The area is situated within a Mesozoic volcanic arc assemblage that lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Neogene 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. These Takla rocks have been intruded by plutons and other bodies of the mainly granodiorite to quartz monzonite Early Jurassic Black Lake Suite and are in turn unconformably overlain by or faulted against Lower Jurassic calc-alkaline volcanics of the Toodoggone Formation (Hazelton Group).

The dominant structures in the area are steeply dipping faults that 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 occurrence area is underlain by felsic to intermediate Toodoggone volcanics. An Early Jurassic granodiorite to quartz diorite stock lies immediately to the south and southwest. The volcanics are gently south-dipping and consist of dacitic porphyritic flows and lapilli and crystal lapilli tuffs (Assessment Report 19097). These have been mapped by Diakow as undivided Toodoggone volcanics consisting of welded lapilli tuff and pyroclastic breccia, rare accretionary lapilli tuff, porphyritic andesite and subordinate basalt lava flows, interspersed volcanic conglomerate, and laminated siltstone and mudstone (Bulletin 86).

Locally, volcanic flows host chalcopyrite and minor bornite with malachite-azurite staining.

In 1995, two grab samples (ST-15 and -16) assayed 1.78 and 0.55 grams per tonne gold, 32.3 and 524.2 grams per tonne silver with 1.34 and 4.88 per cent copper (Assessment Report 24284).

In 2018, a grab sample (100267) from a grey, lichen-covered andesite spine with moderate malachite and weak epidote-calcite veining, located approximately 1.3 kilometres to the west, assayed 0.515 per cent copper (Assessment 38203). Also at this time, a grab sample (100608) of chlorite-epidote–altered monzonite cut by millimetre-sized, partly oxidized chalcopyrite veinlets, located approximately 1 kilometre to the south, yielded 0.249 per cent copper and 6.1 grams per tonne silver, whereas a nearby float sample (100604) from of highly oxidized monzonite hosting pyrite and chalcopyrite assayed 1.15 per cent copper, 0.039 per cent molybdenum and 28.3 grams per tonne silver (Assessment Report 38203).

Work History

The area has been explored in conjunction with the nearby Falcon A1 and A2 (MINFILE 094E 185 and 184) occurrences and a completed exploration history can be found there.