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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  02-Jun-2023 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name EAGL, STIBNITE LAKE, EAGLE MOUNTAIN Mining Division Liard
BCGS Map 104P003
Status Showing NTS Map 104P03W
Latitude 059º 03' 19'' UTM 09 (NAD 83)
Longitude 129º 27' 26'' Northing 6546297
Easting 473774
Commodities Zinc, Antimony, Lead, Copper, Gold, Silver Deposit Types I01 : Au-quartz veins
Tectonic Belt Omineca Terrane Slide Mountain, Cassiar
Capsule Geology

The Eagl 2 (Stibnite Lake) occurrence is located at an elevation of approximately 1580 metres on the south side of a small lake, informally named Stibnite Lake, south of the Dease River, and approximately 15 kilometres southwest of McDame Post and 35 kilometres southeast of community of Cassiar.

Regionally, the area is underlain by basaltic intrusive rocks of the Permian Slide Mountain Complex (Blue Dome Fault Zone). Several kilometres to the southwest, alkali feldspar granite intrusive rocks of the Lower Cretaceous Cassiar Batholith are exposed.

The occurrence area underlain by Upper Paleozoic Sylvester Allochthon greenstones, argillite, siltstone, chert and serpentinite. Bedding in tuffaceous metavolcanics varies in strike from 120 to 160 degrees, with a dip of 35 to 50 degrees north. Northeast- and northwest-trending fractures are common.

Locally, a 2-metre wide, drusy quartz-pyrite vein on the south shore of a small pond, informally named Stibnite Lake, in the northwest part of the Eagl 2 claim, contains coarse stibnite, black sphalerite and minor arsenopyrite, galena and chalcopyrite. The vein can be traced southwest for 50 metres. Quartz-carbonate alteration (ankerite-sericite-clay-mariposite) occurs adjacent to the vein. Colloform textured sulphide-iron carbonate breccias have been reported in the vicinity.

Another stibnite-mineralized vein, 0.10-metre wide, is located several hundred metres west of the main (Stibnite Lake) vein. Three other similarly mineralized zones are reported approximately 600 to 1000 metres to the southeast of the main (Stibnite Lake) zone, near the informally named Shark and SE lakes. These include a 3- by 5-metre weakly mineralized zone on the east shore of SE Lake, a zone of frost heaved mineralized float in a small gully on the west side of SE Lake and a 2- by 5-metre zone of mineralization located approximately 200 metres south of Shark Lake.

In 1983, sampling (41091 through 41093C) of the main (Stibnite Lake) zone yielded values from 0.11 to 1.08 grams per tonne gold and 0.33 to 0.72 per cent zinc, whereas samples (41076C, 41079C and 41099C) from the southeastern zone of mineralization yielded from 0.15 to 0.48 gram per tonne gold with trace to 0.87 per cent zinc (Assessment Report 12218).

Also at this time, a sample (41081C) of silicified dark-green volcanics hosting pyrite and pyrrhotite, located approximately 700 metres northeast of the main zone, assayed 0.50 gram per tonne gold, whereas two samples (41423C and 41424C), located approximately 800 metres southwest of the main (Stibnite Lake) zone yielded values up to 0.12 gram per tonne gold, 12.0 grams per tonne silver and greater than 1.00 per cent copper (Assessment Report 12218).

In 1984, a chip sample (7550E) from trench 2 on the main (Stibnite Lake) zone yielded up to 0.34 gram per tonne gold, 160 grams per tonne silver, 0.59 per cent zinc, 0.40 per cent lead and 5.42 per cent antimony over 0.6 metre (sample 74540E), whereas a 0.6-metre chip sample (7573E) from the western stibnite vein assayed 0.14 gram per tonne gold, 38.0 grams per tonne silver and greater than 0.10 per cent antimony (Assessment Report 12495).

Work History

In 1983, the property was staked by Newmont Exploration of Canada Limited, and sampling was carried out to cover carbonate alteration and weakly mineralized quartz veins associated with strong linear structures. In 1984, work comprised a more systematic prospecting of the claims as well as reassessing the known showings. Picket lines were established in three areas of the claims totalling 24 kilometres of line covering 1.7 square kilometres. Geological mapping and an EM-16 survey were completed in the grid areas and eight small hand trenches were blasted on some of the mineralized zones.

In 1986, Casua Exploration Ltd. completed a program of detailed soil sampling, rock sampling, six diamond drill holes, totalling 376.2 metres, and a ground magnetic and electromagnetic survey on the Eagl 1-5 claims. No information is reported for the three holes drilled on the Eagl 1 (Stibnite Lake) occurrence area.

In 2021, Golden Sky Minerals Corp. completed an airborne geophysical survey on the area as the Eagle Mountain property.

Bibliography
EMPR ASS RPT *12218, *12495, 15150, 15839, 40516
EMPR BULL 83
EMPR EXPL 1983-558; 1986-A41,C460
EMPR FIELDWORK 1987, pp. 245-248
EMPR OF 1989-9; 1996-11
GSC MAP 381A; 1110A
GSC MEM 194; 319
GSC OF 2779
GCNL #120, 1986; #243, 1988
V STOCKWATCH Jul., 1987
Harms, T.A. (1986): Structural and Tectonic Analysis of the Sylvester Allochthon, Northern British Columbia, Implications for Paleogeography and Accretion, Ph.D. Thesis, University of Arizona

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