The ARC occurrence is located on a north-northeast facing slope in the southwestern headwaters of Thane Creek, 3 kilometres north of the Osilinka River and 14 kilometres west of Uslika Lake, approximately 58 kilometres northwest of the community of Germansen Landing. As part of the Thane property (2025), lying between the Osilinka and Mesilinka river valleys, the area is approximately 180 kilometres northwest of Mackenzie and 185 kilometres north-northeast of Smithers.

The area is predominantly underlain by intrusive rock phases of the Triassic-Jurassic Hogem Plutonic Suite. Numerous dikes, sills and small stocks are noted in both the main geological units. These small intrusions are generally related to the Hogem suite. The system observed in the Cathedral and Arc areas is proximal to and outboard of the north-south trending Middle Jurassic Duckling Creek (quartz) monzonite to syenite complex that intrudes the Upper Triassic Thane Creek diorite to (quartz) monzodiorite intrusive phases.

The type of mineralization at the ARC showing (also referred to as Cathedral South) is similar to the nearby Cathedral (MINFILE 094C 181) occurrence. Sulphide mineralization is commonly observed through all rocks. The most abundant sulphides include pyrite and chalcopyrite with sphalerite, arsenopyrite, and molybdenite in trace amounts. The main style of mineralization is fine-grained disseminations with local fracture-fill. Strong chlorite alteration and quartz veining are associated with the best mineralization which appears to be associated with intermediate rock types; monzodiorites, diorites, and locally massive andesites.

A chip sample (2255) from the Arc zone assayed 3.60 per cent copper, 0.018 per cent molybdenum, 7.1 grams per tonne silver and 0.555 gram per tonne gold, whereas a rock sample (35935) assayed 2.02 per cent copper and 1.09 grams per tonne gold (Vanderwart Consulting Inc. [2021-07-12]: Technical Report on the Thane Copper-Gold Project, Omineca Mining Division, British Columbia, Canada).

2021 drill hole TH21-4 intersected two localized low-grade zones of mineralization proximal to areas of silica, carbonate ± magnetite healed chloritic shears. One of these low-grade copper mineralized zones returned 0.05 per cent copper, 0.03 gram per tonne gold, 0.2 gram per tonne silver and 0.0007 per cent molybdenum over 17.30 metres from108.20 to 125.50m downhole (Assessment Report 40622).

Work History

In 2020, Interra Copper Corp. completed a program of geological mapping, geochemical (rock, soil and stream sediment) sampling and a 14.0 line-kilometre induced polarization survey on the area as the Thane property. Interra continued exploration on their Thane property in 2021, with geological mapping, rock and soil sampling at the Pinnacle and Gail areas, soil sampling at the Mat showing and an airborne helicopter magnetic survey at Cathedral. In addition, 2783 metres of NQ diamond drilling was accomplished in 12 holes, to test the depth potential of the prospective Cathedral, Pinnacle, and Gully target areas (Assessment Report 40622). One hole (TH21-4) was drilled in the ARC showing area, referred to as Cathedral South.

Interra Copper Corp. changed their name to Copper Quest Exploration Inc. in early 2025 (Press Release, Copper Quest Exploration Inc., March 3, 2025).