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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  28-Dec-1988 by Dorthe E. Jakobsen (DEJ)

Summary Help Help

NMI
Name BUTTE, HYDER BUTTE, BRIGADIER Mining Division Alaska, USA
BCGS Map 104B010
Status Showing NTS Map 104B01E
Latitude 056º 01' 01'' UTM 09 (NAD 83)
Longitude 130º 04' 01'' Northing 6208479
Easting 433488
Commodities Gold, Silver, Lead, Tungsten Deposit Types I02 : Intrusion-related Au pyrrhotite veins
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Butte property is located southeast of the Salmon River road 5.6 kilometres west of the International Boundary in southeastern 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 plutonic suite of dacitic porphyry dykes and sills, Eocene granitic Hyder intrusives and lamprophyre dykes.

There are several occurences on this property. One, at 107 metres elevation, occurs in a 7.6 metre shaft sunk on a quartz vein that is up to 1.0 metre wide. The vein strikes 148 degrees, dips 65 degrees east and has been traced southeast for 122 metres. Pyrite and galena occur as shoots in the quartz. One assay contained 14.1 per cent lead, 20.57 grams per tonne gold and 706.17 grams per tonne silver (United States Geological Survey Bulletin 807). Another assay was considerably lower.

Two adits were sunk on a quartz vein about 1.0 kilometre south- west of the shaft. This vein has been traced for about 600 metres. The vein trends southeast and is reported to contain rare grains of scheelite with variable quantities of unspecified sulphides (United States Geological Survey Bulletin 1024-F).

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; *1024-140; 1425
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)

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