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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  21-Jul-2021 by George Owsiacki (GO)

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Name THUTADE 4, THUTADE, THUTADE 1-44, RON, RON 1-2, LAKE, LAKE 1-4, SHOWING 8 Mining Division Omineca
BCGS Map 094E006
Status Showing NTS Map 094E02W
Latitude 057º 02' 49'' UTM 09 (NAD 83)
Longitude 126º 52' 16'' Northing 6324622
Easting 629151
Commodities Copper, Silver Deposit Types K01 : Cu skarn
Tectonic Belt Intermontane Terrane Stikine, Plutonic Rocks
Capsule Geology

The Thutade 4 prospect is located approximately 8.5 kilometres west-northwest of the Kemess South deposit (094E 094), about 260 kilometres north of the community of Smithers. The occurrence lies within the Omineca-Cassiar mountains at the southern end of the Toodoggone Gold Camp.

The prospect is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Stuhini Group andesite flows and pyroclastic rocks. Stuhini volcanics have been intruded by the granodiorite to quartz monzonite Black Lake Suite of Early Jurassic age and are in turn unconformably overlain by or faulted against Lower Jurassic calcalkaline volcanics of the Toodoggone Formation (Hazelton Group).

The dominant structures in the area are steeply dipping faults which define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high angle northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Thutade Lake area is largely underlain by andesite volcanics and related sediments of the Stuhini Group and small pockets of Asitka Group sediments. The major structures in the area are north-northwest striking faults, such as the Moose Valley fault and the Ingenika fault. Extensive exploration, including diamond drilling, was conducted on the ground around the Thutade 4 prospect between 1970 to 1984; some nine mineral showings were found. The area hosts fault and/or skarn controlled copper, lead, zinc and silver occurrences throughout.

The Thutade 4 prospect is underlain by fine grained to coarse plagioclase and augite porphyritic, grey to greenish grey to maroon andesite, argillite, chert, quartzite, breccia and conglomerate of the Stuhini Group, and the Early Jurassic Kemess pluton, a large intrusive body of porphyritic monzonite, quartz monzonite and granodiorite. Several bodies of marble have been mapped along the northeast corner of Thutade Lake belonging to the Asitka Group.

Mineralization consists of chalcopyrite, pyrite and malachite occurring as thin smears on fractures and in narrow veinlets in moderately altered purple to green porphyritic andesite. This mineralization has been traced over an area of 91 by 45 metres.

Samples from drillhole 84-8, located at one of several trenches, analyzed 0.41 per cent copper and 6.1 grams per tonne silver over 6 metres near surface (Assessment Reports 13022, 18241). Porphyritic grey and maroon andesite and lesser amounts of similar fine-grained andesite were the lithologies predominantly intersected.

In 1988, a program of trenching, geological, geochemical, and geophysical surveys was completed on the Thutade Lake claim group on behalf of Hermes Ventures Ltd. Work consisted of geochemical (595 soil, 1 stream sediment, 30 rock), Very Low Frequency electromagnetic (VLF-EM) (51.2 kilometres), magnetometer (50.8 kilometres) and induced polarization (IP) (11.6 kilometres) surveys, and trenching (2 trenches and 8 pits totalling 2000 cubic metres excavated). Six targets were investigated by the 1988 program, of which three show promise of further mineralization. However, it is felt that any further mineralization is of limited extent and most likely sub-economic. No further work on the property is recommended (Assessment Report 18241). Work consisting of geochemical, VLF-EM, magnetometer, IP surveys and trenching was performed.

EMPR ASS RPT 2902, 2903, 10161, 12401, *13022, 16882, *18241
EMPR OF 2001-01
EMPR EXPL 1975-E163-E167; 1976-E175-E177; 1977-E216-E217; 1978-E244-E246; 1979-265-267; 1980-421-436; 1982-330-345; 1983-475-488; 1984-348-357; 1985-C349-C362; 1986-C388-C414; 1987-C328-C346; 1988-C185-C194
EMPR FIELDWORK 1980, pp. 124-129; 1981, pp. 122-129, 135-141; 1982, pp. 125-127; 1983, pp. 137-138, 142-148; 1984, pp. 139-145, 291-293; 1985, pp. 167-169, 299; 1987, pp. 111, 114-115
EMPR GEM 1971-63-71; 1973-456-463
EMPR GEOLOGY 1977-1981, pp. 156-161
EMPR PF (Photogeologic Interpretation Map of the Northern Omineca area, (Oct. 1964), Canadian Superior Exploration Limited-in 94E General File; Prospectus, (March 16, 1988), Hermes Ventures Ltd.; Statement of Material Facts, (August 17, 1989), ECOS Resources Ltd.)
EMPR PFD 903196, 676812, 676813
GSC OF 306; 483
GSC P 80-1A, pp. 27-32
ECON GEOL Vol.86, pp. 529-554, 1991
GCNL #23(Feb.1), 1985; #165(Aug.27), 1986
IPDM Nov/Dec 1983
MIN REV September/October, 1982; July/August, 1986
N MINER MAG March 1988, p. 1
W MINER April, 1982; October 13, 1986
WIN Vol.1, #7, June 1987