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File Created: 05-Dec-1988 by Laura L. Duffett (LLD)
Last Edit:  11-Aug-2020 by Karl A. Flower (KAF)

Summary Help Help

BCGS Map 104B086
Status Showing NTS Map 104B15W
Latitude 056º 48' 47'' UTM 09 (NAD 83)
Longitude 130º 53' 35'' Northing 6298174
Easting 384433
Commodities Gold, Silver Deposit Types I02 : Intrusion-related Au pyrrhotite veins
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The oldest rocks on the McLymont property are located in the Northwest Grid area (104B 281) where a several hundred metre thick succession of flat lying, finely-banded, indurated siltstone, chert, sandstone, marble and minor conglomerate have been intruded by a wide- spread underlying granite. The sequence is about 200 metres thick, generally upright, has undergone pervasive hornfelsing and hosts fine- grained garnet porphyroblasts. The thin-bedded sedimentary sequence hosts crinoidal marble (Mississippian age).

Much of the McLymont claim group is underlain by a Jurassic(?) coarse-grained, quartz-rich, pink granite or quartz syenite intru- sion. It underlies and has intruded the stratified rocks and occurs as narrow dykes along pervasive northeast trending faults.

In the central part of the property are numerous quartz-pyrite veins in the quartz-rich granite. The walls of the veins are enriched by k-feldspar. These auriferous quartz-pyrite veins are cut by a series of en echelon ankerite vein swarms that are generally oriented northwest and northeast. They are essentially ubiquitous throughout the northern parts of the claim group and are considered as late replacement veins formed along fractures in both the country rock and intrusive granite.

Mapping in the Northeast Grid area on the McLymont 4 claim indicated the area was underlain by a probable extension of the flat lying banded siltstone, chert, sandstone and volcanic succession which is thought to be Mississippian and older. Locally the strata is represented by dark siltstone with graphitic partings and is generally less indurated than strata with the Northwest Grid area. These rocks have been cut by narrow dykes of quartz-rich granite and are also very rusty with limonite staining. To the east and northeast, granite dominates and encloses scattered pendants of pyritic siltstone.

Within the Northeast Zone, several outcrops along the creeks were found to contain massive pyrite with some sphalerite. This minerali- zation appeared to be localized within intensely altered, pyritized, graphitic siltstone. Rock samples in 1987 indicated the presence of significant gold. In 1988, a drill hole reportedly returned a 3.66 metre intersection containing visible gold (George Cross Newsletter #138, July 19, 1988).

A grab sample taken from a 7.6 centimetre wide quartz-calcite stringer with pyrite and sphalerite assayed 3.29 grams per tonne gold and 2.74 grams per tonne silver. Another 35.6 centimetre vein with pyrite assayed 0.1 grams per tonne gold with 2.74 grams per tonne silver (Assessment Report 16932).

EMPR AR 1961-8; 1962-9; 1963-134
EMPR ASS RPT 4150, 9224, *10418, *11319, *16932
EMPR EXPL 1980-470; *1983-529
EMPR GEM 1972-519
EMPR OF 1989-2
EMPR PR (*Yeager, D.A., Ikona, C.K., (1987): Geological Report on the
McLymont Claim Group, Feb. 1987 in Statement of Material Facts
#70/87 for Gulf International Minerals Ltd., May 14, 1987; *Gulf
International Minerals, McLymont Project, 1988 Information
GSC MAP 9-1957; 311A; 1418A
GSC P 89-1E, pp. 145-154
GCNL #110,#217, 1987; #138,#159,#181, 1988
PR REL (Gulf International Minerals Ltd.: Nov.6, 1986; Jun.8,Jul.16,
Sept.15,Oct.28, 1987; Oct.4,5, 1988)
V STOCKWATCH Jun.9,Oct.28,Dec.4, 1987
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 North-
western British Columbia, Smithers Exploration Group, G.A.C.
Cordilleran Section Workshop, October 16-19, 1988
Equity Preservation Corp. Compilation: Stewart-Sulphurets-Iskut,
Dec. 1988, (Showing No. B5)
Boyd, T. (2019-02-04): Independent Technical Report - Newmont Lake Property