The Porter adit is located about 350 metres north of Del Norte Creek, near the eastern edge of the Cambria Icefield, about 40 kilometres east of Stewart.
The area is underlain by a northerly trending contact between massive andesitic lapilli tuff on the west and more bedded argillites, calcarenites and tuffs on the east, both belonging to the Middle-Upper Jurassic Hazelton Group. The contact is fault controlled, with associated deformation and alteration surrounding the structures. More than one orientation of shearing is evident, indicating a complex deformation history. In the Porter adit area, both brittle conchoidal fractures and ductile shearing are evident within the tuff horizon. East of the contact an argillite-calcarenite unit is intensely deformed along a shear zone at 30 degrees to the foliation orientation within the volcanics. It is undetermined whether the differences in the angle of the shear foliation are indicative of separate structures or, irregular splays from the same event.
Alteration consists of sericite-jarosite and, more locally, quartz veining and silicification. The alteration and associated deformation tend to diminish away from schistose shear zones that host the adit. Jarosite (yellowish stain) occurs mainly within these sericite schists, while sericite development, although concentrated within the shear zones, was also observed on fracture planes throughout the sheared lapilli tuff horizon. Silicification/quartz veining within shear zones is a local feature, with associated increase in pyrite content. Veins within the shears tend to parallel the direction of foliation whereas veins outside shear areas are en echelon type with irregular orientations.
A high percentage of sulphide occurs in areas of strong shearing and silicification with pyrite forming blebs and pods within the structures. Galena, specularite, hematite and chalcopyrite-malachite were observed as fracture-foliation fillings within the sheared tuff. The polymetallic fracture-fillings were not found within areas of sericite schist but tend to he localized in moderately altered, fractured and sheared tuff.
The Porter adit occurs within a sericite-quartz schistose shear zone which was traced for approximately 60 metres along strike. Pyrite, 3-10 per cent by volume, was the only sulphide mineral observed within the shear and the 1 by 2 by 1 metre adit. Significant gold assays were obtained from two areas within sheared and fractured lapilli tuff on the west side of the sericite schist that hosts the adit. Chip sample #39913 assayed 4.88 grams per tonne gold and 12.2 grams per tonne silver over 1.8 metres and, 4.2 metres to the east, chip sample #39916 assayed 0.93 gram per tonne gold and 4.4 grams per tonne silver over 1.5 metres (Assessment Report 19642).
In 1989, work on the Del Norte project by Goodgold Resources Ltd. comprised grid-controlled mapping and rock sampling, and a limited VLF-EM survey. In 2005, a helicopter-borne AeroTEM II electromagnetic and magnetic survey was carried out on behalf of Teuton Resources Corp. over the Del Norte-Midas property and a total of 1299.5 line-kilometres was flown.
During 2017 through 2019, Teuton Resources completed programs of geochemical (rock and soil) sampling, an airborne geophysical (ZTEM and magnetic) survey and four diamond drillholes on the Del Norte property.
