The Murray A (Pit or Quarry zone) occurrence is located in the extreme northern headwaters of Longsworth Creek, approximately 4.3 kilometres northwest of the creek’s mouth on Upper Arrow Lake.

The area is underlain by north-northwest striking and northeast dipping quartz-biotite and chlorite schists and basaltic volcanic rocks of the Carboniferous to Permian Kaslo Group. To the west, paragneiss metamorphic rocks of the Early Proterozoic Monashee Complex are exposed. These have been intruded by quartz monzonite of the Middle Jurassic Kuskanax Batholith.

Three main areas of mineralization, referred to as the A (Pit), B (New) and C (Creek) zones, have been located and comprise disseminated to semi-massive to massive sulphides. The B and A zones are located approximately 0.6 and 1.6 kilometres to the northwest of the C zone, respectively. Thin section work indicates some remobilization and re-crystallization of the sulphide mineralization along both bedding planes and crosscutting veins and fractures. The sulphides consist of pyrite, chalcopyrite, pyrrhotite, with lesser galena and sphalerite in semi-conformable shears with true widths up to one metre in places. Small, narrow, un-mineralized aplitic dikes are associated with some of the mineralized shear zones. Some malachite and azurite occur in oxidized zones. Sulphide mineralization is also evident peripheral to quartz veins.

In 1984, a grab sample from a pit on the A zone assayed 0.9 per cent copper (Assessment Report 12702). In 2010, a rock sample (189585) assayed 1.6 grams per tonne silver and 0.30 per cent copper (Assessment Report 31470).

The prospects, Murray A, B and C zones, were originally discovered in 1983 by local prospectors Cameron and Jenkins, who staked six 20- unit claims to cover the showings. The owners conducted detailed prospecting over parts of the property. In addition, representatives from companies including Billiton, Canamax and Noranda conducted several examinations of the Murray property. Exploration conducted on the Murray property during the company property reviews include collection of 161 soil samples at 75 -metre intervals on lines spaced 300 metres apart located over the creek showing and on road traverses transecting the area. A total of 23 rock samples were also collected by Canamax. Leishman provided eight rock samples from throughout the property for petrographic study. In 1987, GWR Resources completed a work program of grid establishment, additional soil sampling and a magnetometer/VLF-EM survey were conducted over 14 line kilometres of the grid. Thirty-two rock samples and 342 soil samples were collected for analyses. Three areas were tested by backhoe trenching. Claims covering the key showings at the Murray property subsequently lapsed. In 2001, Orphan Boy Resources completed a program of geological mapping and rock sampling on the area. In 2010 and 2012, Selkirk Mineral Syndicate completed programs of silt, soil and rock sampling.