The S and M deposit is located on the northwest side of Whipsaw Creek, approximately 26 kilometres southwest of Princeton. The Five Fissures showing (MINFILE 092HSE098) is 900 metres south of this occurrence.

The region in the headwaters of Whipsaw Creek is underlain to the west by intrusive and metamorphic rocks of the Late Jurassic to Early Cretaceous Eagle Plutonic Complex and to the east by metamorphosed volcanics and sediments of the Upper Triassic Nicola Group. The contact between the two units strikes north-northwest.

A fault zone strikes slightly west of north, up the north bank of Whipsaw Creek. The zone cuts chloritic schist of the Nicola Group and varies in width from 5 metres to greater than 10 metres. The fault contains lenticular zones of brecciation healed by ankerite, dolomite or calcite. This zone continues southward across Whipsaw Creek for at least 1.5 kilometres and hosts several other deposits (Knight and Day, MINFILE 092HSE072; Five Fissures, MINFILE 092HSE098).

Within a zone of faulting and brecciation, pyrite, sphalerite, galena and chalcopyrite occur as disseminations and blebs in quartz-carbonate veinlets a few millimetres to 40 centimetres wide, and in narrow quartz veins generally up to 15 centimetres wide. This mineralization is accompanied by limonite and minor cerussite (lead carbonate).

A selected sample from a quartz vein assayed 2 grams per tonne gold, 310 grams per tonne silver, 8 per cent lead and 8 per cent zinc (Minister of Mines Annual Report 1927, page 253). A 0.9-metre chip sample, taken across stronger mineralization exposed in an adit, assayed 0.34 gram per tonne gold, 48.0 grams per tonne silver, 0.2 per cent copper, 2.1 per cent lead and 1.9 per cent zinc (Minister of Mines Annual Report 1928, page 264).

In 1986, diamond drilling encountered several sections, 3 metres long, averaging 0.48 gram per tonne gold, 34 grams per tonne silver and at least 1 per cent combined zinc, copper and lead (Assessment Report 15042, page 6).

The deposit was explored as early as 1911. Pacific Slope Mines Ltd. and Copper Basin Mines Ltd. trenched and tunnelled the deposit between 1927 and 1931. A carload of ore grading 8.3 grams per tonne gold equivalent for combined gold and silver was shipped by Copper Basin Mines to the Trail smelter in 1931 (Minister of Mines Annual Report 1931, page 130). In 1969, Silver Tip Explorations Ltd. mined 32 tonnes grading 1 gram per tonne gold, 546 grams per tonne silver, 13.6 percent lead and 5.96 per cent zinc.

Whipsaw Mines Ltd. conducted trenching, soil sampling and geological mapping between 1970 and 1973. In 1986, Lone Jack Resources completed eight diamond drill holes, totalling 939.94 metres. During 1982 through 1993, World Wide Minerals completed various programs of prospecting and, geochemical sampling and drilled 16 holes, totalling 1769 metres, on the area. During 1995 through 1998, Martech Industries completed 10 diamond drill holes, totalling 1033.5 metres, on various targets over the Whipsaw property. In 2000, a pulp sampling program was completed to test for platinum group elements from former trenching and drilling programs but results were disappointing. In 2005, Canfleur Mining completed a program of sampling and seven diamond drill holes, totalling 1452.8 metres, on the area. During 2010 through 2015, Martech Industries completed programs of rock and soil sampling.