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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  29-May-2015 by Karl A. Flower (KAF)

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NMI 092H11 Au3
BCGS Map 092H054
Status Showing NTS Map 092H11W
Latitude 049º 34' 43'' UTM 10 (NAD 83)
Longitude 121º 21' 03'' Northing 5493087
Easting 619218
Commodities Gold Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Methow, Plutonic Rocks
Capsule Geology

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.

EMPR AR 1890-378; 1891-575; 1892-542; 1893-1072; 1896-563; 1899-744; 1900-905; 1901-1086; *1902-1086
EMPR ASS RPT 8708, 25451, 25890
EMPR BULL 20, Pt. IV, pp. 20-23; 79
GSC MAP 737A; 12-1969; 41-1989
GSC P 69-47
GSC SUM RPT 1911, p. 129
EMPR PFD 650168, 650171