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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  15-Oct-2021 by George Owsiacki (GO)

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NMI 104N12 Au10
Name RELIEF, OTTAWA, SIS, COMO LAKE Mining Division Atlin
BCGS Map 104N052
Status Showing NTS Map 104N12E
Latitude 059º 35' 35'' UTM 08 (NAD 83)
Longitude 133º 40' 18'' Northing 6606842
Easting 574996
Commodities Gold, Silver Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Cache Creek, Plutonic Rocks
Capsule Geology

The Relief occurrence is located just south of Como Lake on the south side of the road, about 3 kilometres north of the community of Atlin.

The showing is hosted within dark green, massive andesites to basalts of the upper Mississippian to Permian Nakina Formation (Cache Creek Complex). These rocks are often referred to as greenstone. The occurrence lies just south of the Jurassic Fourth of July Creek batholith which covers an area of 780 square kilometres north and northwest of Atlin. It is composed primarily of hornblende-bearing diorites to quartz diorites.

Mineralization occurs in quartz stringers up to 30 centimetres wide sparsely mineralized with pyrite. The volcanic country rock is reportedly "carbonate altered" and some references to magnesite are made; the geology and mineralization of this occurrence are poorly documented. The veins are said to strike 040 degrees, dipping 60 degrees to the southeast.

Samples taken in 1904 reportedly averaged around 9 grams per tonne gold. In 1931, a dump sample analyzed trace gold and 10 grams per tonne silver. The property was worked primarily in 1904 with a short shaft and drift but has not been worked significantly since.

In 1988, prospecting and sampling of the old workings was performed by B.T. White.

In 2005, Blind Creek Resources Ltd. collected 15 soil and 23 rock samples for analyses. In 2006, Blind Creek Resources Ltd. conducted exploration on their Como Lake property claims which covers the Relief showing. An area of about 1500 hectares was prospected and a total of 30 rock samples, of which one was float, and 32 soil samples were collected. In 2008, Blind Creek Resources Ltd. conducted geological observations and collected 45 soils, 3 silts and 11 rocks, primarily around the outside borders of the claims.

Bibliography
EMPR AR *1904-79; *1931-64
EMPR ASS RPT 15788, 28126, 28933, 30600, 31232, 31377
EMPR FIELDWORK 1990
EMPR GEOS MAP 2004-4
EMPR OF 1990-22; 1996-11
EMPR PFD 820224, 674333
GSC MEM 307
GSC OF 864
GSC P 74-47
DIAND OF *1990-4
Cordey, F. et al. (1987): Significance of Jurassic Radiolarians from the Cache Creek Terrane, British Columbia, in Geology Vol.15, pp. 1151-1154

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