In the Tun showing area, foliated quartz diorite of Lower or Middle Triassic age are overlain by volcanics of the Upper Triassic Stuhini Group. These are intruded by quartz monzonite and monzonite of the Paleocene to Eocene Sloko-Hyder Plutonic Suite. The monzonites are intruded by a quartz feldspar porphyry and andesite dikes.

A 200-metre-wide mineralized, sheared and altered zone occurs in the quartz monzonite. The shears are 15 to 120 centimetres wide and strike 030 to 050 degrees with vertical dips. Alteration minerals include chlorite, clay, epidote and quartz within gouge and siderite and hematite within calcite-quartz veins. The veins contain disseminated chalcopyrite, bornite, and minor malachite and azurite. The copper mineralization and minor molybdenite is also disseminated within the quartz monzonite and a quartz-potassium feldspar pegmatite mass.

Work History

In 1973, the TUN Claim Group (TUN 1 to TUN 8 claims) was staked on behalf of Hudson Bay Exploration and Development Company Limited. The 1974 exploration program on the TUN Claim Group consisted of a chain and compass grid, covering much of the area of TUN 1 to TUN 4 claims, followed by a magnetometer survey, an EM-16 survey, geological mapping and sampling of the main showings.

In 2020, Brixton Metals Corporation completed a program of geochemical (rock and soil) sampling, a 12.5 line-kilometre ground induced polarization survey, a 715 line-kilometre airborne magnetic and electromagnetic survey and 19 diamond drill holes, totalling 5292 metres, on the area of as part of the Thorn property. Drilling was performed on the Outlaw (MINFILE 104K 176) occurrence area.