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File Created: 26-Mar-92 by Dave Nelles(DMN)
Last Edit:  26-Mar-92 by Dave Nelles(DMN)

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NMI 092H11 Au5
Name DOLLY VARDEN, RECIPROCITY, JUBILEE Mining Division New Westminster
BCGS Map 092H054
Status Showing NTS Map 092H11W
Latitude 49º 35' 01" N UTM 10 (NAD 83)
Longitude 121º 19' 23" W Northing 5493687
Easting 621214
Commodities Gold, Copper, Lead Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Methow, Plutonic Rocks
Capsule Geology

The area of the Dolly Varden occurrence, in the vicinity 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 dykes.

Gold is spatially associated with feldspar porphyry dykes and sills in the area of the three forks of Siwash Creek. 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 (092HNW004) for details of regional geology and typical mineralization style in the Siwash Creek area.

Development work within the Dolly Varden/Jubilee claims consisted of a number of opencuts spread along one such dyke, striking northwest and dipping to the northeast. At one point, a quartz vein varying from 30 to 60 centimetres wide occurs along one wall of the dyke with Ladner Group slate along the other. Rocks on either side of the quartz vein are cut by a network of quartz stringers. Pyrite, chalcopyrite and galena occur in the quartz and the porphyry. Gold was reported to have been panned from surface samples.

An adit, started at an elevation of 1152 metres, was apparently driven to intersect the dyke, which is described as a highly altered (silicified) pyritic aplite. Samples across the dyke contained only trace amounts of gold and silver.

Bibliography
EMPR AR 1915-262
EMPR ASS RPT 8708
EMPR BULL 20, Pt. IV, pp. 20-23; *79, p. 67
EMPR PF (*O'Grady, B.T. (1937): Siwash Creek Area Lode-Gold  Deposits (refer to Emigrant - 092HNW017))
GSC MAP 737A; 12-1969; 41-1989
GSC P 69-47
GSC SUM RPT *1911, p. 129

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