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File Created: 25-Aug-2014 by Garry J. Payie (GJP)
Last Edit:  01-Apr-2022 by Karl A. Flower (KAF)

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BCGS Map 093M012
Status Prospect NTS Map 093M04E
Latitude 055º 09' 54'' UTM 09 (NAD 83)
Longitude 127º 38' 03'' Northing 6114000
Easting 587000
Commodities Copper, Gold, Silver Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
I06 : Cu+/-Ag quartz veins
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Silvertip Basin stockwork zone occurs in the small cirque at the head of Silvertip Creek, in an area locally known as Silvertip basin. It is above 1600 metres elevation, surrounded by rugged mountains on three sides and to a large extent floored in coarse, blocky talus. It is midway between the Rocher Deboule (093M 071) and Highland Boy (093M 070) mines, on the immediate easterly projection of the Rocher Deboule #4 vein, which would pass through the stockwork zone. The stockwork has limited exposure as small, isolated areas of altered and mineralized outcrop along the creek, amongst the talus and on the immediate walls of the cirque.

The area of the Silvertip Basin occurrence is underlain by hornfelsic greywackes and siltstones of the Jurassic to Lower Cretaceous Bowser Lake Group which are intruded by the Rocher Deboule porphyritic granodiorite stock of the Late Cretaceous Bulkley Plutonic Suite.

The granodiorite underlying the stockwork zone is broken and altered and lighter in colour than found on the overlying mountain slopes. It is more or less bleached to a whitish colour through the removal of mafic minerals and it has developed a light tan colour.

Locally, the granodiorite is associated with pegmatite. Altered and bleached granodiorite is often intimately associated with coarse hornblende-feldspar-quartz pegmatite that contains magnetite, chalcopyrite. A similar pegmatite area at the “Shower Show” has alteration but it is otherwise unmineralized.

In the stockwork zone, the altered granodiorite commonly contains limonitic hairline fractures and it locally contains veins and pods of quartz that are either weakly or strongly correlated with pegmatite, malachite and more rarely, chalcopyrite. Numerous showings were located in-amongst the talus; however, they tend to cluster in an area described as five discrete locations (Areas A to E) (Figures 14-18, Assessment Report 33297).

In 2011, American Manganese collected a total of 224 rock samples from 180 sites in an area of approximately 1000 by 2000 metres. Of these, 119 were found to be anomalous in at least one metal. However, most contained a combination of greater than 0.5 gram per tonne gold, greater than 1.5 grams per tonne silver and greater than 0.1 per cent copper; an average of 4 one-metre samples (over a consecutive surface interval) assayed 0.25 gram per tonne gold, 3.2 grams per tonne silver and 0.33 per cent (Assessment Report 33297). Another 1 metre chip sample of a "black calcite" pod assayed 82.1 grams per tonne gold, 10.7 grams per tonne silver and 0.03 per cent copper (Assessment Report 33297). The full extent of the stockwork zone was yet to be delineated.

In 2012, American Manganese Inc. completed a minor program of rock and soil sampling on the area.

During 2016 through 2019, American Manganese Inc. completed further programs of geochemical (rock and soil) sampling and 10.2 line-kilometres of ground magnetic surveys on the area as the Rocher Deboule property.

EMPR FIELDWORK 1978, pp. 102,103; 2006, pp. 1-17
EMPR MAP 22; 53; 58; 65, 1989
EMPR OF 1990-32; 1992-1; 1990-32; 1992-1; 1992-3; 1998-10; 2008-6
GSC OF 551; 720; 2322; 5705
GSC P 44-24; 51-10, p. 43
Parent, R., Marais, C. (2020-10-25): NI 43-101 Technical Summary Report on the Rocher Deboule Property