The Tis showing is located between two small lakes on the westerly slopes of Mount Brown, about 19 kilometres south of Stewart. The showing was first identified in 1990 and lies adjacent to a glacial tongue about 2.3 kilometres west of the summit of Mount Brown.
The showing area contains polished outcrop recently exposed by retreat of the glacier, with a strongly gossanous zone measuring several hundreds of metres in extent. Underlying rocks include mixed lithic andesitic breccias, quartzite, argillite, and minor limestone intruded by narrow lamprophyre dikes proximal to a granodiorite. These strata are part of the Lower to Middle Jurassic Hazelton Group. Much of the showing area contains a strong to mylonitic, northwest-striking foliation. The showing consists of silicified and brecciated corridors up to 15 metres wide enveloped by an extensive hornfels, wollastonite, actinolite skarn assemblage. Within these corridors, 1-5 per cent pyrite, pyrrhotite, and arsenopyrite occur as disseminations and as aggregates in quartz veins. Actinolite is pervasive being best developed along fractured faces in association with massive epidote, chlorite and strong silicification. The most intensely developed hornfelsed rock results in an intensely foliated fabric of actinolite/biotite laminations. At the north end of the showing, andesitic lapilli tuffs are in contact with granodiorite; the contact is in part silicified.
In 1990, work included 18 separate rock saw-cut channel samples across the exposed outcrop and sampled in 1.0 metre intervals. The weighted average of the 103 metres of channels represented by this sampling is 0.528 gram per tonne gold, with the highest 1.0 metre interval producing 8.39 grams per tonne gold, and an isolated grab sample returning 22.2 grams per tonne gold with 11.59 per cent arsenic. In 1993, the showing was re-examined and sampling yielded 2.03 grams per tonne gold (Assessment Report 28961).
During a 2006 exploration program conducted on the Praxis Project on behalf of Mineral Hill Industries Ltd., chip and grab samples were collected from the Tis showing and immediately surrounding areas. The sampling program made no attempt to duplicate previous chip or channel sampling, but was directed toward assessing the potential of the area to host significant high-grade mineralization. Results were generally low, with minor anomalous arsenic and gold. However, prospecting in the surrounding area resulted in the discovery of a new showing 600 metres north of the Tis, the Persuader showing.
Granby Gold Inc. conducted geological mapping, airborne magnetometer and gamma ray spectrometry surveys (and geological interpretation of the same) over their East Georgie River project area, including the TIS showing, from 2013 to 2020. Circular magnetic high patterns to the east and southeast of the Persuader showing, suggest that an intrusive may be concealed below the glacier. A magnetic low lineament trends southeast from the Persuader showing and appears to mark a division of a single magnetic high or a contact between separate highs. A broad arc of elevated magnetic intensity is noticeable north, west, and south of the Persuader showing, tending to form a ring exterior to the circular magnetic highs. Four areas of interest were identified by the fractal analysis ‘heatmaps’ in 2018, suggesting anomalous structural complexity / disturbance. Particular attention is focused about Rhyolite Ridge, extending southeast from the Persuader mineralization and flanking the Ashwood on the eastern block of the overall property.
