The Pakk (Upper Jack, Lower Jack and Jack Vent) occurrence is in the north western head waters of Jack Creek, an east-flowing tributary of Hellroaring Creek, at an elevation of approximately 2225 metres.
The area is underlain by quartzite, wacke, argillite and siltstone of the mid-Proterozoic (middle) Aldridge Formation (Purcell Supergroup), intruded by meta-gabbro or meta-diorite of the Proterozoic Moyie Intrusions.
At the surface, three zones of mineralization, referred to as the Upper Jack, Lower Jack and Jack Vent zones, have been identified and consists of a fragmental structure with abundant galena, sphalerite, pyrrhotite and arsenopyrite in massive lenses, veins and disseminations. The structure is 30 metres wide and is traced in outcrop for 800 metres. Mid-Proterozoic (Helikian) Aldridge Formation (Purcell Supergroup) marker beds outcrop nearby.
Diamond drilling has identified a near-vertical–dipping structure consisting of discordant fragmental rocks approximately 10 metres thick. The crosscutting fragmental rock is bracketed by a 20-metre thick zone of intensely altered sediments. Sulphides form all or part of the fragmental matrix. Sphalerite and galena are dominant, with lesser pyrrhotite, arsenopyrite and chalcopyrite. The fragmental host rock is intensely tourmalinized along with garnet, albite and actinolite with abundant muscovite and biotite. Scheelite is widely scattered throughout the fragmental rocks and in the adjacent sediments. The scheelite occurs as large disseminated crystals and as thin veinlets.
In 2015, rock sampling of a laminated silt stone hosting disseminated pyrrhotite and chalcopyrite to the south east of past drill holes yielded up to 0.375 per cent copper and 2.7 grams per tonne silver (Sample CK15-333; Assessment Report 35828).
In 2016, re-sampling of the core from drill hole P99-1 yielded up to 0.240 per cent lead and 0.463 per cent zinc over 20 centimetres (Sample 2109108; Assessment Report 36105).
In 1993 and 1994, Cominco completed 36.6 line-kilometres of electromagnetic surveying on the area as the Roar claims.
The Lower Jack zone was discovered in 1999 during prospecting along a newly constructed logging road in a steep, overburden-covered area. Several large, lead-zinc bearing, hydrothermally altered, angular tourmalinite and Aldridge Formation fragmental float boulders occur in a 300 by 300 metre area. The float boulders are well mineralized with galena, sphalerite, arsenopyrite and pyrrhotite. This discovery was staked in the summer of 1999 and is now part of what is called the Pakk property. The Upper Jack zone was also discovered by prospecting in the area and is located 2500 metres northwest of the Lower Jack zone. A third discovery, the Sinclair zone (MINFILE 082FNE117), is 2000 metres north-northeast of the Upper Jack zone. The Pakk property includes the Horn, Burn, Pit and Pakk claim groups.
In 1999, Chapleau Resources Ltd. conducted a diamond drilling program on the Upper Jack Vent zone, where three short diamond drill holes (P99-1, 2, 3), totalling 631.1 metres, were completed to acquire preliminary geological data. In 2004 and 2005, Klondike Gold completed a 3.6-kilometre access road and two diamond drill holes, totalling 1767.9 metres, on the area. In 2015, the area was prospected and sampled by T. Kennedy. In 2016, Kootenay Silver re-sampled the core from a drill hole completed in 1999.
