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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  07-Oct-2019 by Garry J. Payie (GJP)

Summary Help Help

NMI
Name CREST, BLUEBIRD Mining Division Skeena
BCGS Map 104B010
Status Prospect NTS Map 104B01E
Latitude 056º 01' 01'' UTM 09 (NAD 83)
Longitude 130º 03' 44'' Northing 6208474
Easting 433782
Commodities Gold, Lead, Copper, Tungsten, Molybdenum Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Insular Terrane Stikine
Capsule Geology

The Crest property is located east of the Salmon River in south- eastern Alaska.

Located in the Intermontane Belt, the area, bounded on the west by the Coast Crystalline Complex and on the east by the Bowser Basin, is part of the Stikinia Terrane.

The showing is hosted by the Upper Triassic to Lower Jurassic Hazelton Group Unuk River Formation metavolcanics. The Hazelton Group is a northwest trending, steeply east dipping belt of folded andesitic lapilli tuffs, flows and breccia containing a thick sequence of argillite and siltstone infolded along a synclinal axis. The sequence is intruded by the Early Jurassic Texas Creek granodiorite, Eocene granitic Hyder intrusives and lamprophyre dykes.

The Discovery vein has been traced for 107 metres, strikes 130 degrees, dips 55 to 70 degrees east and is narrow but continuous. The vein, locally only stringers, occurs in a fissure zone developed in Texas Creek granodiorite that is mineralized with disseminated pyrite and fracture coating galena. The zone is 61.0 centimetres wide with exposures indicating an average width of 23.0 centimetres. Minerali- zation consists of local shoots heavily mineralized with galena, pyrite and a little chalcopyrite. Free gold is reported from an open cut where the vein consists of small stringers. The mineralized shoots run from 11.6 to 19.9 grams per tonne gold ($7.00 to $12.00 per tonne; United States Geological Survey Bulletin 807).

The Bluebird vein is 400 metres to the east-southeast of the Discovery vein at 678 metres elevation. The vein, which is also hosted in Texas Creek granodiorite, is exposed for 61.0 centimetres and is 10.0 centimetres wide. Mineralization consists of sparsely disseminated pyrite, chalcopyrite, galena, scheelite and molybdenum along the vein walls. Three hand specimens were estimated to contain 0.5 per cent tungsten oxide (Wo3) - (United States Geological Survey Bulletin 1024-F).

In early May of 2019, Decade Resources Ltd. reported that they had acquired claims over the historic Crest property in December of 2018 and followed in the same month with preliminary sampling in stream beds along the Granduc Road which crosses the property. A total of 5 silt were collected and 12 rusty-appearing float rocks in the stream beds were sampled. Results of silt samples ranged up to 0.224 grams per tonne gold(?). Three float rock samples from creeks yielded as follows (News Release, Decade Resources Ltd, May2, 2019):

Location Sample Number Gold (grams per tonne) Silver (grams per tonne)

Creek 4 CR-18-13 2034 412

Creek 5 CR-18-14 3.91 2.0

Creek 5 CR-18-17 3.67 599

Bibliography
EMPR BULL 58; 63
EMPR FIELDWORK 1983, pp. 149-165; 1984, pp. 316-342; 1985, pp. 217-219
EMPR OF 1987-22; 1991-17
EMPR REGIONAL PF (Mineral Terranes of Alaska, 1982 Plate F;
Sutherland-Brown, A., (1951): Cordilleran Structure in Canada and
Alaska)
GSC MEM 175
GSC P 89-1E, pp. 145-154
CIM Spec. Vol. 8, pp. 149-170,215-229
CJES VOL 10, Part 1, 1973, pp. 408-420
USGS BULL 722; 800; *807-81,82; *1024-139; 1425
PR RE; Decade Resources Ltd Jan.29, May*2,9, 2019
Brown, D.A., (1987): Geological Setting of the Volcanic-Hosted Silbak
Premier Mine, Northwestern British Columbia, M.Sc. Thesis,
University of British Columbia (in Property File: 104B 054)
EMPR PFD 752897

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