The Montrose occurrence is located southwest of Siwash Creek, approximately 3.4 kilometres east of its creek mouth on the Fraser River.
The area near the confluence of the north, middle and south forks of Siwash Creek is characterized by poorly to moderately bedded, dark- coloured, pyritic, slaty argillite locally intercalated with thin beds of greywacke and siltstone, all assigned to the Ladner Group. These rocks have been intruded by locally altered, light-coloured, felsic sills and dikes.
Gold is spatially associated with feldspar porphyry dikes and sills in the area of the Montrose occurrence. Fine gold, occurring both in pyritic quartz veins and their intrusive host, is generally coated with a film of iron oxide (Bulletin 79, page 62). Refer to the Roddick occurrence (MINFILE 092HNW004) for details of regional and typical deposit geology in the Siwash Creek area.
The Montrose occurrence was discovered in the early 1890's, around the same time as the Roddick occurrence, and may represent the north westward strike extension of the mineralization explored there. By 1901, underground development totalling 107 metres had been completed, exposing a 2.44-metre wide "ledge" at the face of a drift. Assays ranging from $15 to $25 per ton (24.88 to 41.47 grams per tonne gold equivalent) were reported.
In 1980, Aquarius Resources prospected and took soil samples in the area. In 1998, Hillsbar Gold completed a program of geological mapping and geochemical sampling on the area as the Mike claim.