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File Created: 14-Jul-1988 by Laura L. Coughlan (LLC)
Last Edit:  10-Aug-2020 by Karl A. Flower (KAF)

Summary Help Help

BCGS Map 104B065
Status Showing NTS Map 104B11E
Latitude 056º 37' 17'' UTM 09 (NAD 83)
Longitude 131º 05' 12'' Northing 6277189
Easting 371966
Commodities Gold, Silver, Lead, Zinc, Copper Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
I02 : Intrusion-related Au pyrrhotite veins
Tectonic Belt Insular Terrane Stikine
Capsule Geology

Three stratigraphic assemblages have been mapped in the area: (1) Upper Palaeozoic sediments and volcanics of the Stikine Assemblage, (2) clastic sediments of the Triassic Stuhini Group, and (3) Lower Jurassic sediments and volcanics of the Hazelton Group.

Four plutonic suites intrude the above; (1) Late Triassic calc-alkaline intrusions coeval with Stuhini Group stratigraphy, (2) Jurassic Copper Mountain, (3) Jurassic Texas Creek and (4) Tertiary Coast Plutonic suite. Metallogenically, Texas Creek potassium feldspar megacrystic porphyries are of primary interest as they are spatially associated with a number of gold deposits and showings in the area.

With the area of the C1 zone average assays of 34.28 grams per tonne gold occur in quartz veins that crosscut altered sediments and volcaniclastics. These showings lie below the Stonehouse Gold Deposit (104B 107) on Johnny Flats. The juncture below the Johnny Mountain main Gold zone and the hummocky Johnny Flats is marked by a strong northeast trending fault that appears to separate a feldspar porphyry/ volcaniclastic sequence from a thick, tightly folded greywacke, lithic wacke, siltstone sequence. Movement along this fault is right lateral and exhibits about 150 metres offset (Grove, 1987).

Rocks on the Johnny Flats comprise a sequence of intercalated phyllitic grit, siltstone and thin rhyolitic members. These rocks occur in an area mapped as being underlain by Upper Paleozoic strata.

Mineralization associated with the quartz veining within the altered sediments consists mainly of pyrite with some sphalerite, galena and chalcopyrite. In 1984, samples taken from this area assayed 25.0 grams per tonne gold, 78.51 grams per tonne silver, 1.8 per cent lead, 0.7 per cent zinc and 11.79 grams per tonne gold, 40.11 grams per tonne silver, 0.3 per cent lead with 1.0 per cent zinc. Another sample from a quartz vein assayed 33.57 grams per tonne gold, 50.06 grams per tonne silver with 2.8 per cent lead and 1.6 per cent zinc (Skyline Explorations Ltd., Reg Project, 1984 Promotional Brochure).

Assessment Report 28103 (from Spirit Bear Minerals) quotes the following from a private company report by Skyline Gold. The C-1 prospect occurs in Stonehouse Creek as quartz veins containing high grade gold and silver with galena, sphalerite and chalcopyrite. Three mineralized veins have been exposed by trenching. Previous detailed sampling of these veins yielded grades as high as 60.9 grams per tonne gold and 520 grams per tonne silver across 0.9 metre as well as 45.8 grams per tonne gold and 101 grams per tonne Ag across 0.8 metre. A single drill hole drilled beneath two of the trenches encountered low gold grade quartz veining. A third vein discovered just downhill from the drill pad yielded a grade of 45.8 grams per tonne Au over 0.8 metre after drilling was completed.

Refer to Johnny Mountain (Stonehouse) (104B 107) for details of a common property work history.

EMPR AR 1968-41
EMPR ASS RPT 630, 769, 5275, 9090, 9964, 10510, 13245, 13674, 15763
21672, 23147, 24361, 25372, 27380, *28103, 28745, 29673
EMPR EXPL 1980-470; 1981-167; 1983-524; 1984-387; 1985-C381-C382
EMPR GEM 1972-518; 1973-501
EMPR GM 1997-03
EMPR OF 1989-10; 1990-16; 1994-1; 1992-1; 1992-3; 1998-10
EMPR PR PF (Grove, E.W., (1986): Geological Report, Exploration and Development Proposal for Skyline Explorations Ltd., Reg Property, Apr. 20, 1986; (1987): Stonehouse Gold Deposit Reg Property of Skyline Explorations Ltd., Sept. 15, 1987 in Canadian Institute of Mining and Metallurgy, Eleventh District 6 Meeting, Vancouver, British Columbia, Oct, 29-31, 1987)
EMPR PF (Refer to Stonehouse - 104B 107; Snip - 104B 250)
GSC MAP 9-1957; 311A; 1418A
GSC P 89-1E, pp. 145-154
Anderson, R.G., (1988): A Paleozoic and Mesozoic Stratigraphic and Plutonic Framework for the Iskut Map area (104B), Northwestern British Columbia, pp. A1-A5, in Geology and Metallogeny of Northwestern British Columbia, Smithers Exploration Group, G.A.C. Cordilleran Section Workshop, October 16-19, 1988
Burgoyne, A.A. (2012-05-07): Technical Report on The Iskut Property with Special Reference to Johnny Flats & Burnie Trend Targets
Placer Dome File
Skyline Explorations Ltd., *Reg Project (1984, Promotional Brochure)