The GG (Coho) zone is located at an elevation of approximately 1030 metres on a generally south-facing slope incised by a small east-west–trending ravine, approximately 6 kilometres east-southeast of Lhole Tse Mountain.

Regionally, the area is underlain by undivided volcanic rocks of the Lower Jurassic Chuchi Lake succession that have been intruded by quartz monzonitic to monzogranitic rocks of the Lower Jurassic Hogem Plutonic Suite.

Locally, float samples of medium-grained potassium feldspar-biotite-hornblende intrusive and metavolcanics with malachite, chalcopyrite and pyrite were originally identified. Later work (2020) identified an in-situ zone of quartz-carbonate-sulphide–veined and altered (propylitic) monzodiorite associated with an east-west–trending fault zone.

Mineralization comprises 0.10- to 0.30-metre-thick banded sulphide-quartz veins with fine sphalerite, chalcopyrite, galena and minor sphalerite. Fine quartz-chalcopyrite, pyrite-malachite veinlets and fractures are location on the south side of the east-west–striking fault and these veinlets dip steeply southwest and northwest directions. The altered and mineralized zone has been traced for a width of 30 metres and along strike for at least 350 metres. At the west end of the zone a 2-metre-wide, strongly altered, dark siliceous dike crosscutting(?) the main structure hosts disseminated (10 to 15 per cent) chalcopyrite. To the south of the west end of the mapped mineralized zone, a subparallel fault zone, oriented at 260 degrees and dipping north at 75 degrees, with associated copper mineralization has been identified. The mineralization was reported over a width of 11 metres and occurs approximately 55 metres south of the main mineralized fault.

A chalcopyrite-quartz–mineralized and altered fault breccia zone is reported to be located approximately 160 metres north of the main fault zone. The fault dips steeply north, is 5 to 6 metres wide and has been traced for 50 metres along strike.

The original GG zone, located approximately 900 metres southeast of the Coho zone, comprised a 5-metre-wide float zone of gossanous quartz vein material containing sphalerite, galena, chalcopyrite, and pyrite. Vein segments are 5 to 10 centimetres wide and are hosted within contact-metamorphosed grey and maroon-grey plagioclase-porphyritic latitic agglomerate of the Lower Jurassic Chuchi Lake Formation (Takla Group). The agglomerate contains fragments and large irregular amygdules in a broken crystal matrix. Lower Jurassic monzonitic and syenitic intrusions of the Upper Triassic to Lower Cretaceous Hogem Intrusive Complex form much of the bedrock in the area.

The occurrence may be related to the Skook alteration halo (MINFILE 093N 140) and other sulphide vein occurrences near the contact of the Hogem Complex. Refer also to the SRM occurrence (MINFILE 093N 104) which comprises mineralized ground on the Klaw 3, 8 and 9 claims.

Work History

In 1967, Tro-Buttle Exploration Ltd. completed a program of soil sampling and geological mapping on the area as the Jay claims.

In 1971, the SRM 1-20, 25-66, and CIR 1-20 claims were held by S.E.R.E.M. Ltd. Work during the year included geological mapping, a geochemical soil survey and a 37.7 line-kilometre magnetometer survey. Further work during 1973 included a geochemical survey comprising 345 soil and 17 silt samples.

The Klaw One and Klaw Two claim groups were staked by Noranda Exploration Company Limited in 1987 and 1988 to cover an area of gold-anomalous heavy metal concentrate samples. The GG is contained within the Klaw Two group claims. In 1989, Noranda drilled 29 holes in the Klaw area but only six were reported on (Assessment Report 220314). This drilling occurred on the SRM occurrence (093N 104) to the northeast of the GG.

Also in 1989, C.E.C. Engineering Ltd., on the behalf of S.C.M. Services Ltd., completed a program of geochemical (rock, silt, and soil) sampling and a 45.0 line-kilometre airborne geophysical survey on the area as the Goldbrick 1-5 claims. In 1990, BP Resources Canada Ltd. completed a 210.0 line-kilometre airborne geophysical survey on the Goldbrick 1-5 claims.

In 1991, the Klaw groups were under option to BP Resources Canada Limited. BP carried out 24.5 line-kilometres of line cutting, 20.6 line-kilometres of induced polarization-resistivity surveying, geological mapping and rock sampling, and one 121.9-metre-long diamond drill hole (Assessment Report 21807); however, most of this work (including the drillhole) appears to have occurred on a gridded portion of the Klaw claim several kilometres to the southwest. No mineralization was reported.

Nation River Resources held the area of the GG showing within its Skook claims in the 1990s but there is report of work being done in the GG area. Refer to the Wit occurrence (093N 141) for details of a common work history pertaining to the entire Skook property (Assessment Report 24172).

In 2005, High Ridge Resources Inc. staked the area as part of the Chuchi property.

During 2009 through 2019, Ronald J. Bilquist conducted programs of prospecting, rock and soil sampling, and geological mapping on the area as the Chuchi 1-10 claims. In 2017, float samples (CH17200 and CH17206) of the intrusive and metavolcanic from the Coho zone yielded 0.927 and 0.465 per cent copper, 11.1 and 24.2 grams per tonne silver with 0.080 and 0.668 per cent lead, respectively (Assessment Report 36951).

In 2020, Cirrus Gold Corp. completed a program of prospecting, geological mapping, rock sampling and an airborne magnetic survey on the area as the Chuchi South project. Twenty-one rock samples from the Coho zone yielded an average of 1.95 per cent copper, 2.88 grams per tonne gold and 15 grams per tonne silver with ranges of 0.0309 to 10.25 per cent copper, 0.006 to 16.15 grams per tonne gold and 0.3 to 66.7 grams per tonne silver (Bravewolf Consulting [2021-07-07]: NI 43-101 Technical Report on the Chuchi South Project, Central British Columbia). Three of the ‘higher’ grade gold samples, yielding 7.57 to 16.15 grams per tonne gold, were from pyrite-chalcopyrite– and galena-chalcopyrite–bearing quartz veins (Bravewolf Consulting [2021-07-07]: NI 43-101 Technical Report on the Chuchi South Project, Central British Columbia).