MINFILE Mineral Inventory

MINFILE Record Summary

MINFILE No 104B 073

XML Extract / Production Report / Inventory Report

File Created:	24-Jul-1985	by	BC Geological Survey (BCGS)
Last Edit:	04-Jul-1988	by	Larry Jones (LDJ)

SUMMARY

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		NMI
Name	RIVERSIDE, LINDEBORG, 7 MILE, ICKIS, RIVERVIEW, CROSS	Mining Division	Alaska, USA
		BCGS Map	104B010
Status	Past Producer	NTS Map	104B01E
Latitude	056º 00' 13''	UTM	09 (NAD 83)
Longitude	130º 04' 17''	Northing	6206999
		Easting	433188
Commodities	Silver, Lead, Gold, Copper, Tungsten, Zinc	Deposit Types	I05 : Polymetallic veins Ag-Pb-Zn+/-Au I12 : W veins
Tectonic Belt	Intermontane	Terrane	Stikine

Capsule Geology

Volcanics and sediments of the Lower Jurassic Hazelton Group are intruded by the Early Jurassic Texas Creek Plutonic Suite consisting of coarse-grained granodiorite. These are cut by north trending granodiorite porphyry dykes, which are related to the Hyder quartz monzonite, lamprophyre dykes, and a mylonite zone known as the Lindeborg Shear Zone. The zone, which strikes 135 to 145 degrees and dips steeply northward, has a 600 metre length, 200 metre vertical depth and 25 metre width.

The Lindeborg Shear Zone contains the Lindeborg Vein, consisting of quartz veins and stringers, mineralized with pyrite and galena and lesser pyrrhotite, scheelite, chalcopyrite, sphalerite, tetrahedrite, arsenopyrite and native gold. Gangue minerals include quartz, epidote, calcite, ankerite and barite. The vein trends 120 degrees, dips 60-80 degrees northeast, varies from 1 to 3 metres in width and is discontinuously developed along the length of the shear zone. A one metre channel sample from the underground workings assayed 89 grams per tonne silver, 1.15 per cent lead, 1.37 grams per tonne gold, 0.21 per cent copper and 0.01 per cent tungsten oxide (United States Geological Survey Bulletin 1024-F, Plate 17).

The Riverside Mine also contains two mineralized quartz veins, known as the Ickis (Riverview) and Cross veins, within the granodiorite. The Ickis Vein strikes northwest, dips steeply to the northeast, is 80 metres long and is up to 1.4 metres wide. It lies 120 metres southwest of and is parallel to the Lindeborg Vein. The Cross Vein, which is between the Lindeborg and Ickis veins, strikes north, is 230 metres long and varies from 0.2 to 1.4 metres wide. Mineralization in both veins is similar to the Lindeborg Vein.

From 1925 to 1950, total production, mainly from the Lindeborg vein, was 84,086 grams of gold, 2,976,342 grams of silver, 34,338 kilograms of copper, 1,024,320 kilograms of lead, 31,752 kilograms of tungsten and 8120 kilograms of zinc. This came from 26,434 tonnes of milled ore. (United States Geological Survey Bulletin 1024-F, page 129).

Bibliography

EMPR AR 1922-G72

EMPR BULL 58; 63

EMPR FIELDWORK 1983, pp. 149-165; 1984, pp. 316-341; 1985, pp. 217-219

EMPR OF 1987-22; 1991-17

EMPR P 1988-4 (in press)

EMPR PF (Report by Noel, G.A., (approx.1965): The Productive Mineral Deposits of Southeastern Alaska)

EMPR REGIONAL PF (Mineral Terranes of Alaska, 1982, University of Alaska, Plate F)

GSC MAP 1418A

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 *807, pp. 77-81; *1024-F, pp. 127-136; 1425

Allen, D.G., (1964): Geology and Mineralogy of the Riverside Mine, Alaska, B.A.S. Thesis, University of British Columbia

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)

EMPR PFD 18181, 888076, 501793, 501796, 507858, 507859, 507860, 507861, 507862