The T-4 occurrence is located approximately 30 kilometres southeast of the community of Dease Lake.
The area of the occurrence is underlain by an assemblage of Upper Triassic to Lower Jurassic volcanic and volcaniclastic rocks consisting of grey and maroon plagioclase porphyry, andesite, volcanic conglomerate, tuffaceous mudstone, breccia, rhyolite, minor siltstone and shale. The Middle to Late Jurassic Snowdrift Creek pluton occurs several kilometres to the northeast.
The Camp zone consists of a quartz-carbonate infilled breccia cut by coarse, crystalline quartz veining. The zone is about 4 metres wide and occurs in silicified mafic volcanic rock. Coarse-grained dioritic rock is also reported. Grab samples of well mineralized quartz-carbonate breccia were taken across the zone (Assessment Report 22458). Sulphide mineralization consists of 2 to 5 per cent sphalerite with variable amounts of galena, chalcopyrite, and pyrite. One grab sample assayed 7.86 per cent zinc (Assessment Report 22458). Copper and gold values from grab samples were in the 0.5 to 1 per cent and the 0.1 to 0.4 gram per tonne range, respectively.
A number of mining companies have conducted regional programs in the area in the late 1960s and early 1970s but there is no mention of these showings recorded until 1991 when the property was held by Akiko-Lori Gold. The ground was held as the Lotus claims in 1971 by Nittetsu Mining Co. Ltd. and some soil sampling was reported. Utah Mines held the ground as the Ken and Tom claims in 1975 and the Tanzilla claims of Canadian Superior Ltd. covered the showing area in 1978. In 1989, Equity Silver Mines conducted substantial geophysical and geological work on their Thorn claims, part of which covered the showing area. In 1991, Akiko-Lori Gold prospected the Tanzilla claims and reported the Camp zone. In 2003, the Tanzilla property owned by A. Travis was under option to Hyder Gold Inc. who completed an exploration program consisting of the collection of 28 silt and 19 rock samples along with prospecting and geological examinations.
The Tanzilla property was acquired in April 2011 by West Cirque Resources Ltd. and covers the Tanzilla 1 (104I 022), Tanzilla 3 (104I 023), Thorn 75 (104I 102), Station M20 (104I 142) and T-4 (104I 050) showings. In 2013, induced polarization, Terraspec, and structural surveys were conducted over the property. The Terraspec survey was undertaken to map the distribution of alteration minerals, particularly clay minerals, which can assist in defining zones of porphyry alteration and mineralization. The structural geology mapping program was conducted in order to identify structures that host porphyry-style alteration to assist in locating porphyry mineralization at depth. Two lines of induced polarization survey totalling 6.6 kilometres were conducted to further delineate the chargeability anomaly under Silica Ridge and to identify subsurface structure and resistivity signatures that might relate to zones of copper-gold porphyry mineralization.
In 2013, West Cirque Resources Ltd. signed an Earn-In Agreement with Freeport-McMoRan Corporation of Canada Limited to explore West Cirque’s Tanzilla and Pliny Properties. In June of 2014, West Cirque Resources Ltd. was acquired by Kaizen Discovery, and the option agreement with Freeport continued with Kaizen Discovery as the optionor. In 2014-15, Kaizen Discovery carried out a diamond drilling program totalling 3332 metres in eight holes. Seven holes were drilled on the Silica Ridge zone (104I 142) and one hole on the Gopher zone (104I 050).
Drillhole TZ15-02 was collared in a lithocap style alteration and mineralization zone (Gopher). The Gopher zone consists of a ridgeline with interspersed outcrops of a bladed feldspar porphyry and strongly sheared and altered schists that contain clay minerals. On the top of the ridge the strongly altered rocks are juxtaposed across a steeply dipping fault from unaltered plagioclase+pyroxene/hornblende porphyritic intrusive rocks.
