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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 HOBO Mining Division Alaska, USA
BCGS Map 104B010
Status Showing NTS Map 104B01E
Latitude 056º 01' 14'' UTM 09 (NAD 83)
Longitude 130º 02' 41'' Northing 6208860
Easting 434879
Commodities Zinc, Gold, Silver, Lead, Copper Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
J01 : Polymetallic manto Ag-Pb-Zn
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Hobo showing 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 plutonic suite of dacitic porphyry dykes and sills, Eocene granitic Hyder intrusives and lamprophyre dykes.

On the Hobo property three open cuts have exposed mineralized veins or vein-like replacement deposits. These veins strike almost east-west.

At 732 metres elevation, a 3.0 metre open cut exposes 1.5 metres of mineralization consisting of pyrite veins and disseminations, quartz lenses and stringers of solid sulphide (mainly sphalerite), fracture filling sphalerite and a vein of solid pyrrhotite 5.0 centi- metres thick with minor chalcopyrite. Other sulphides present are galena and arsenopyrite. Quartz and calcite are the main gangue minerals.

The gold content is extremely variable and low in pyritic and pyrrhotitic ore. Silver content is generally low. Some samples are reported to carry 308 grams of gold per tonne (United States Geologi- cal Survey Bulletin 807).

A pyritic quartz vein occurs on the Red Rose claim (location undetermined).

A stockwork zone 61.0 centimetres wide occurs in a fissure zone in metavolcanic rock south of the claim at 884 metres elevation. The zone strikes 155 degrees and dips 60 degrees south. Mineralization consists of 5.0 centimetres of quartz heavily mineralized with pyrite, galena and sphalerite.

Bibliography
EMPR BULL 58; 63
EMPR FIELDWORK 1983, pp. 149-165; 1984, pp. 316-342; 1985, pp. 217-219
EMPR OF 1987-22
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; *807-84; 1024; 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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