The Cultus Creek occurrence is located on the southern arm of Cultus Creek, approximately 5 kilometres southwest of its junction with the north arm.
The occurrence lies along a band of occurrences extending from the Humdinger & Hunkadora (MINFILE 082FSE082) and Peanut (MINFILE 082FSE081) occurrences to the south and the Iva Fern (MINFILE 082FSE037) occurrence, approximately 2 kilometres to the northwest.
The area is underlain by rocks, formerly assigned to the Dutch Creek Formation of the middle Proterozoic Purcell Supergroup that have been remapped to lie within the Irene Volcanic Formation of the Horsethief Creek Group (upper Proterozoic Windermere Supergroup). In detail (Assessment Report 10484), they consist of schistose greenstone (possible andesitic tuffs) overlain or intercalated with orange-weathering dolostone, siltstone and phyllitic shales. The granitic Nelson Batholith lies to the west of the claims; metamorphic grade is staurolite amphibolite just to the south of the property but may be greenschist in the area of mineralization.
The mineralization is variously described as a vein in a mineralized band of altered and silicified limestone contained in a formation of highly metamorphosed sedimentary rocks, or (more recently) as disseminated sulphides in a silicified dolostone unit or units contained in andesitic tuffs. Lamprophyre dikes are found near but not necessarily associated with the mineralization, which consists mainly of oxidized material containing disseminated pyrite, chalcopyrite and tetrahedrite. At the north end of the mineralized zone, which may be stratigraphically close to that of the Iva Fern (MINFILE 082FSE037) occurrence, quartz veins are hosted in siltstone between two carbonate units.
In 1926, samples assayed up to 0.84 per cent copper, 16 grams per tonne silver and 0.1 gram per tonne gold (Minister of Mines Annual Report 1926).
In 1981, four samples (801008-01 to -04) from the north end of the Don claim assayed from 0.02 to 0.84 per cent copper and 3.4 to 15.7 grams per tonne silver (Property File - MineQuest Exploration Associates Ltd. [1981-03-01]: Letter and Report on the Don Claims).
The area has been historically explored in conjunction with the nearby Iva- Fern occurrence since the early 1900’s. In 1981, MineQuest Exploration Associates examined the area as the Don claims. Work included programs of soil sampling, prospecting, geophysical surveys and geological mapping. In 1985 and 1986, Agincourt Explorations completed programs of prospecting, geological mapping, sampling and geophysical surveys. In 1987 and 1988, New Spirit Resources examined the area. In 1993 and 1994, Yukon Revenue Mines examined the property with programs of road work, trenching and diamond drilling.