The Jumbo (L.187) occurrence is located on the south west side of Slesse Creek, approximately 500 metres north of the Canada-U.S. border and at an elevation of 815 metres.

The area is underlain by the Devonian to Permian Chilliwack Group consisting of mafic volcanic rocks and metamorphosed argillaceous rocks. Proterozoic and Paleozoic amphibolitic rocks of the Yellow Aster Complex occur as fault slices in contact with the Chilliwack Group on the west, and Oligocene intrusive rocks of the Chilliwack Batholith on the east.

The host rock of the Jumbo occurrence is an iron-rich argillite striking 320 degrees. The first adit, on the Jumbo Crown grant, followed a seam of quartz, approximately 30 centimetres wide, for approximately 30 metres, where it pinched out. Later government assays of the quartz yielded no values.

The second adit, approximately 150 metres lower in elevation on the Lincoln Crown grant, was driven for approximately 18 metres into iron-stained argillite. A sample from an open-cut in the adit area yielded trace gold and 27 grams per tonne silver (Minister of Mines Annual Report 1915, page 307).

In 1988, a mineralized area designated the Torb zone was discovered in a possible shear zone on the eastern edge of the Jumbo Crown grant. This zone consists of a sulphide lens stained with malachite and containing chalcopyrite, pyrite, minor pyrrhotite and possibly bornite. A rock grab sample (103752H) assayed 22.90 grams per tonne gold and greater than 1 per cent copper. The same year, two other samples (64757 and 64758) from the zone yielded up to 7.4 grams per tonne gold, 9.08 per cent copper and 38.4 grams per tonne silver (Assessment Report 18237). Another sample (103751H), taken 180 metres to the north, assayed 14.10 grams per tonne gold and 0.31 per cent copper (Assessment Report 18237). In 2008, two samples (08KRP007 and 08KRP008) from the Torb zone yielded up to 1.68 grams per tonne gold, 12.25 grams per tonne silver and 1.03 per cent copper (Assessment Report 30147). In 2010, a 0.4 metre chip sample (08KRP611) assayed 2.14 grams per tonne gold, 25.4 grams per tonne silver and 6.11 per cent copper (Assessment Report 31937).

Another area of mineralization, referred to as the West Torb zone, outcrops a couple hundred metres to the west of the Torb zone and consists of graphitic schist hosting pyrite and pyrrhotite.

The property was first explored in approximately 1904 and 1905, with the development of several open-cuts and two adits. In 1978, Aquarius Resources completed a soil sampling program on the area as the Sles 1 claim. In 1987 and 1988, the area was prospected and sampled as the Roy claims. In 2005, the area was prospected as the Slesse Creek property. In early 2008, the area was prospected as the Silesia 1-2 claims. During 2008 through 2012, Wedge Resources completed programs of rock, soil and silt sampling and a 0.6 line-kilometre ground magnetic survey on the area.