The Comfort zone is located on the ridge separating Quattrin and Yehiniko creeks, at approximately 1750 metres elevation, south-southwest of Yehiniko Lake.
The area is underlain by Upper Triassic rocks of the Stuhini Group. Various large intrusion surround the Stuhini rocks in the Yeti area. Tonalite intrusions of the Middle Jurassic Three Sisters Plutonic Suite occur to the north and south, granodioritic intrusions of the Late Early Cone Mountain Plutonic Suite occur to the southwest, and a large unnamed Middle to Late Triassic quartz dioritic intrusion borders the Stuhini rock on the east. The volcanic sequence consists mainly of massive to faintly feldspar- and/or pyroxene-porphyritic andesitic flows with lesser intercalated beds of siltstone, lapilli tuff and volcanic conglomerate. The beds generally strike northwest and dip moderately to the southeast. The package is not highly deformed although it is possible that north trending, vertical faults crosscut the area. The Comfort Zone lies to the west of the diatreme-like breccia and quartz stockwork zone and serpentinite-talc area, and may include pyroxenite and fine grained strongly magnetic basalt or ultramafic.
The ultramafic “Yeti” body is in contact with the Stuhini rocks on its west and north and with the large unnamed Middle to Late Triassic quartz dioritic intrusion on the east. The “Yeti” ultramafic complex is a relatively small elongate intrusive body related to the Middle to Late Triassic Polaris Ultramafic Suite. This suite is an Alaskan-type intrusion that comprise a series of mafic-ultramafic complexes concentrated in northern British Columbia. The geochemical survey reported by Toscana Resources in 1990 (Assessment Report 21168) straddled the northern part of the “Yeti” body.
Locally, propylitic, silicified and K-feldspar altered intermediate to basaltic volcanic flows, welded crystal tuff, and various hypabyssal phases of a composite tonalite intrusion host quartz-carbonate filled fractures and veins containing chalcopyrite and pyrite with minor bornite, sphalerite and galena mineralization with localized course native gold. On the Yeti property, the veins vary from 0.01 metre to over 1 metre in width.
The Main Zone (104G 194) of the Yeti prospect lies along the immediate east side of the Main Ridge, extending from the Comfort Zone, through the Pass to the Wolf Zone and Goat Ridge to the north (see Figure 6, Assessment Report 21168). Within this area, ankerite-limonite gossans trend obliquely across the east slope; these gossans contain quartz-carbonate veins, and breccia with pyrite, chalcopyrite, and locally sphalerite and galena. Wallrock alteration consists of chlorite-epidote-quartz and K-feldspar, with ankerite-limonite staining. Gypsum or anhydrite was noted occasionally.
In 1990, Coast Mountain Geological and Quest Canada Exploration Ltd. performed a reconnaissance stream sediment survey, revealing several multi-element anomalies from tributary streams of the West Yehiniko and Yehiniko rivers. In 1992, Toscana Resources completed a program of prospecting, geological mapping and sampling on the Yehiniko property. This work outlined an area, 1600 metres long by 1200 metres wide, containing strong copper and gold mineralization. A 3 metre rock chip sample (92R-39) taken across an ankerite-limonite shear zone, trending 040 degrees, containing pyrite, sphalerite and galena assayed 1.06 grams per tonne gold, 0.095 per cent copper, 0.14 per cent lead, 0.41 per cent zinc and 0.9 gram per tonne silver; sample 92R-37 assayed 6.6 grams per tonne gold, 2.5 grams per tonne silver, 0.53 per cent copper, 0.37 per cent lead and 0.24 per cent zinc over 0.3 metres (Assessment Report 22773).
In 2018, owner Carl Von Einsiedel arranged for a high resolution helicopter-borne aeromagnetic and radiometric survey to be flown over the Yeti Block including the Comfort occurrence. It consisted of 78 line kilometres, including 71 line kilometres flown at an orientation of 002/182 degrees and 7 kilometers of tie lines flown at 092/272 degrees. The line spacing was 200 meters and the survey was flown at an average survey height of 50.7 meters above terrain. Also in 2018, in order to verify the reported high nickel values from 1990, the current owners collected 9 rock and soil southern boundary of the 1990 soil survey grid.
See Yeti (104g 194) for details of the Yeti property, including geological and work history details.
