The Cathedral occurrence is located about 3.5 kilometres north of Haha Creek and approximately 58 kilometres northwest of the community of Germansen Landing.

The Cathedral property area is predominantly underlain by intrusive rocks of the Early Jurassic Hogem Plutonic Suite. Intermediate volcanic rocks of the Upper Triassic Takla Group are in contact with the Hogem rocks in the northeastern portion of the property. Numerous dikes, sills and small stocks are noted in both the main geological units. These small intrusions are generally related to the Hogem suite.

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. Some of the best mineralization is related to massive andesites. These rocks have intense chlorite and weak to strong silica alteration and may have quartz plus/minus calcite veining. Disseminated, chunky or fracture-fill chalcopyrite is abundant. Monzodiorites and diorites also exhibit strong chalcopyrite mineralization. They generally have chlorite plus/minus epidote, silica, potassic, and limonitic alteration. Magnetite appears to have an inverse relationship to areas of high copper mineralization as it appears to be on the fringes. Rocks with abundant magnetite have weak copper grades and as magnetite decreases in strength chalcopyrite mineralization increases. Monzonites and syenites have weak to moderate chalcopyrite and pyrite mineralization.

Potassic and magnetite alteration become dominant with decreased chlorite. Within these more felsic units, sulphide precipitation appears to be selective to mafic minerals, commonly noted with chlorite altered interstitial amphibole and biotite. Granodiorites, porphyritic dikes, and andesite tuffs exhibit subtle alteration. Although a few samples have been noted to contain disseminated chalcopyrite, the majority of these rock types have weak mineralization, generally with various amounts of disseminated pyrite and magnetite.

In 2011, a rock sample (#6074) assayed 5.13 per cent copper, 1.51 grams per tonne gold and 19.1 grams per tonne silver (Assessment Report 33099). The sample was taken from andesite that is strongly gossanous on the weathered surface with dark green colouration on the cut surface. Sulphide mineralization is strong with disseminated to chunky chalcopyrite and pyrite and close to semi-massive in abundance.

In 2012, Thane Minerals Inc. conducted work on the large Cathedral property. Copper, gold, and silver mineralization at the Cathedral zone is associated with quartz veins, disseminated sulphides within the host intrusive rocks, and structural controls. Grab samples assayed up to 13.95 grams per tonne gold (www.thaneminerals.com).

Work History

In 2009-10, C.O. Naas examined the provincial Regional Geochemical Survey data and British Columbia MINFILE which led to the staking of the Thane Creek property tenures. A comprehensive compilation of historical exploration work was undertaken and identified four areas that indicated excellent potential for copper-gold mineralization. In 2010, a property visit was carried out and explored three of the target areas identified by the compilation program. Exploration consisted of geochemical sampling with collection of 10 silt samples and 69 rock samples. In 2012, Thane Minerals Inc. carried out exploration at multiple areas on the Cathedral property including the Tenakihi (094C 071), Link (094C 123), Osilinka (094C 050), Cathedral (094C 109, 181), Gail (094C 072, 133), Cirque (093N 093), and Lake (094C 188) zones. Exploration consisted of silt sampling, soil and talus fine sampling (contour and gridded), rock sampling, and geological mapping. A total of 36 silt samples, 785 soil and talus fine samples, and 749 rock samples were collected. Approximately 1525 hectares were geologically mapped at 1:10,000 scale. Analyses of soil and talus fine samples and selected rock and silt samples have been carried out by x-ray fluorescence (XRF).

In 2013, Thane Minerals undertook a prospecting program at the Pinnacle showing (094C 187) and at the Lake area (094C 188). A total of 54 rock samples were collected at the Pinnacle showing, while 23 rock samples were collected at the Lake area. Additionally, a 2.275 line-kilometre survey grid was established at the Lake area from which 96 soil samples were collected. At the Pinnacle showing, a 60-metre-wide fault zone was mapped, which contained a minimum of seven faults striking 150 to 170 degrees and dipping 50 to 60 degrees west. Sampling from the two westernmost and two easternmost faults returned the most significant gold results (up to 3.60 grams per tonne and 7.78 grams per tonne, respectively), though anomalous gold is also present within the central structures of the 60-metre-wide fault zone. Of the 54 rock samples collected from the Pinnacle showing (and its strike extensions), 16 returned greater than 0.1 gram per tonne gold and seven returned greater than 1.0 gram per tonne. Additionally, eight samples returned greater than 0.1 per cent copper with a maximum of 2.91 per cent copper. In 2015, an airborne geophysical survey was undertaken on all mineral tenures of the Cathedral property and four days of prospecting at the Mat (094C 099, 135) and Pinnacle showings and the ET (094C 010) and Lake areas. The work program consisted of: 974 line-kilometres of helicopter-borne magnetic and radiometric surveying; and 22 rock samples and 7 sediment samples for geochemical analysis. In 2016, prospecting was undertaken on select areas of the property. A total of 56 rock samples and 79 soil samples were collected at the newly acquired CJL (094C 176) showing. A total of 6 stream sediment samples, 49 soil samples and 24 rock samples were collected to test a historical sediment sample of anomalous gold values from the northern portion of the property, west of the Mat showing (RS Creek). At the OY showing (094C 071), a total of 22 stream sediment samples were collected. In 2017, a structural and alteration study was undertaken at the Cathedral area. Mineralization was considered to be the result of a structurally controlled alkalic porphyry system. Due to the moderate dip of the mineralization, the system was speculated to be tilted post-emplacement about a north-south to northwest-southeast axis of approximately 45 degrees, similar to Mount Milligan. In 2018, a total of 959 soil samples were collected from 24.0 kilometres of survey lines established in three areas within the south and southeastern portions of the property. Four areas of anomalous soils were returned from the program. In early 2019, the creation of a geological library was started. A total of 27 rock samples, representing different styles of mineralization and geological rock types found at the Cathedral area, were submitted for petrographic study. Twenty-eight samples from different geological rock units from various locations throughout the property were selected for whole rock analysis. In July, a one-week prospecting program was undertaken in the northern region of the Cathedral area. Rock sampling returned up to 1.33 per cent copper and 0.85 gram per tonne gold from narrow quartz veins and along fracture planes. Also in 2019, fieldwork consisted of induced polarization surveying (8.9 kilometres), including the grid establishment, at the Cathedral area. Rock samples (5) were collected during the course of setting out the survey grid. The objective of the induced polarization survey was to test the depth potential of copper mineralization found in both rock and soil samples. The Cathedral area was selected, as the survey would complement the structure and alteration study undertaken in 2017. The induced polarization survey parameters were set at a reconnaissance level, which would allow for greater survey coverage (Assessment Report 39082).

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. Three rock samples (1286, 2027 and unknown) from an area located approximately 300 to 400 metres south-southeast of the Cathedral occurrence assayed 2.0, 2.5 and 5.9 per cent copper with 0.27, 1.36 and 2.49 grams per tonne gold, respectively, whereas a rock and chip sample (unknown and 2282), taken from an area east-northeast of the Cathedral occurrence, yielded 2.32 and 0.69 per cent copper with 0.722 and 0.181 gram per tonne gold over an unknown length and 0.80 metre, respectively (Vanderwart Consulting Inc. [2021-07-12]: Technical Report on the Thane Copper-Gold Project, Omineca Mining Division, British Columbia, Canada).