The WESTERN occurrence is located on the north side of Marshall Creek, approximately 1.5 kilometres northwest of its junction with Brett Creek, approximately 22 kilometres east-northeast of Gold Bridge, B.C.

The area is underlain by a sequence of imbricated chert, intermediate volcanics, gabbro, limestone, blueschist and clastic rocks ranging in age from Permian to Jurassic of the Bridge River Complex, which are intruded by felsic dikes and numerous dikes of serpentinite and their altered equivalents.

Locally, there is a steeply dipping, southeast trending, mineralized shear zone, ranging from 1 to 4 metres wide and at least 45 metres in strike length.

The area was originally staked in 1987 and preliminary exploration programs by Caldera Resources Ltd. consisting of geological mapping, soil and rock sampling, ground geophysical surveys and trenching were completed in 1991. In 1990, extensive trenching identified anomalous gold and silver, particularly from 5 zones in Trench 90-1. Gold values ranged from 0.24 to 0.68 gram per tonne and silver values from 2.5 to 3.9 grams per tonne over apparent widths of 2.5 to 18 metres (Assessment Report 20786).

Similar exploration work by Gray Rock Resources Ltd. commencing in 1995, identified two anomalous zones, known as the Western and Southeastern zones. In 1995, sampling of the shear zone assayed: 8.9 grams per tonne gold over 2.8 metres, 5.8 grams per tonne gold over 1.2 metres, 9.6 grams per tonne gold over 1.0 metre, and 28.4 and 48.0 grams per tonne from grab samples along strike (Assessment Report 24348).

From 2005 to 2007, Gray Rock Resources completed programs of prospecting and ten diamond drill holes, totaling 1759.06 metres, on the Silver Stream property. Seven of the holes, totaling 246.57 metres, were completed on the Western occurrence. In 2005, DDH SS-05-01 assayed 7.3 grams per tonne gold over 2 metres and 5.41 grams per tonne gold over 9.14 metres within two separate intervals of chert breccia (Assessment Reports 28502, 29474). Gray Rock's 2012 program consisted of a geological evaluation with rock geochemical sampling. A 0.5 metre chip sample from a shear in the Western zone returned 24.9 grams per tonne gold, and 41.3 grams per tonne silver along with anomalous arsenic, lead and zinc values (Assessment Report 33490).