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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  17-Oct-1991 by Robert G. Gaba (RGG)

Summary Help Help

NMI 092O2 Hg2
Name APEX, QUARTZ MOUNTAIN, BAR C Mining Division Lillooet
BCGS Map 092O017
Status Prospect NTS Map 092O02E
Latitude 051º 07' 28'' UTM 10 (NAD 83)
Longitude 122º 39' 46'' Northing 5663718
Easting 523599
Commodities Mercury Deposit Types I08 : Silica-Hg carbonate
Tectonic Belt Intermontane Terrane Bridge River
Capsule Geology

The Apex mercury prospect is on the northeast slopes of Quartz Mountain and is accessible by a rough road from the nearby Poison Mountain road system. The Apex prospect is within carbonate and silica altered peridotite, serpentinite and greenstone of the Shulaps Ultramafic Complex. These rocks are now essentially listwanite and occupy an elongate zone up to 500 metres wide adjacent to the Yalakom fault. To the southwest, these rocks are in fault contact with greenstone and clastic sedimentary rocks of the Permo-Triassic Bridge River Complex, and to the northeast are in fault contact with middle Jurassic turbiditic sandstone and shale. Sills, dykes and plugs of augite diorite and plagioclase porphyry occur within the altered and unaltered serpentinite.

Cinnabar as fine veinlets, specks, blebs and lenses is in and along walls of grey translucent banded chalcedony which comprises part of the listwanite. The chalcedony contains some breccia fragments of ankeritized volcanic rock. Chalcedony veins either trend north and dip steeply, or strike 115 degrees and dip 35 degrees to 60 degrees to the south. Cinnabar also occurs, to a lesser extent, as disseminations throughout the listwanite and ankeritized greenstone. However, some areas of intensely listwanite-altered rocks contain only a trace of mercury. Foliated serpentinite and ankeritized volcanic rocks cut by diorite and porphyry contain only a trace of mercury. A sample of chalcedony breccia in listwanite containing cinnabar assayed 0.14 per cent mercury (Assessment Report 1916).

Approximately 1 kilometre to the northwest, a sample of listwanite from this belt of rocks contains traces of arsenic, antimony, mercury and gold (Open File 1988-9).

Bibliography
EMPR AR 1946-97, 1967-128, 1968-160
EMPR ASS RPT *1916
EMPR FIELDWORK 1974, p. 35; 1985, pp. 303-310; 1986, pp. 23-29; 1987, pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72; 1990, pp. 75-83
EMPR OF 1987-11; 1988-3; 1988-9; 1989-4; 1990-10
EMPR PF (Report By J.S. Stevenson, 1944)
EMR MP METALS FILE (HG-301.00)
GSC MAP 1963-29; 1882
GSC MEM 130
GSC OF 534; 2207
GCNL #155,1968
N MINER Mar.1, 1989
EMPR PFD 881759, 700000

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