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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  04-Dec-2012 by Karl A. Flower (KAF)

Summary Help Help

NMI
Name WET, SR Mining Division Alberni
BCGS Map 092C086
Status Prospect NTS Map 092C15W
Latitude 048º 50' 11'' UTM 10 (NAD 83)
Longitude 124º 57' 38'' Northing 5411122
Easting 356135
Commodities Molybdenum Deposit Types L05 : Porphyry Mo (Low F- type)
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Wet occurrence is located on an un-named, northerly flowing, tributary of the South Sarita River, approximately 8 kilometres east of the community of Bamfield.

The area is underlain by intermediate to felsic volcanics of the Lower Jurassic Bonanza Group which are intruded by a complex of porphyritic quartz monzonite, diorite, quartz diorite and feldspar porphyry correlated with the Early to Middle Jurassic Island Plutonic Suite.

Diamond drilling intersected a complex stratified sequence of hydrothermally altered andesites, dacites, rhyolites and silicified equivalents of felsic rocks (felsites). The volcanic units are intruded by dykes and sills of quartz feldspar porphyry, diabase, diorite and andesite. The volcanics lie above propylitically altered medium-grained intrusives varying in composition from quartz monzonite to granodiorite. The contact between the volcanics and intrusives is marked by a zone of cataclastic deformation which encompasses both rock types and includes major breccia, shear and fault structures.

Molybdenite occurs primarily in silicified and biotitized felsic volcanic units. Dark green andesitic sections which are altered to chlorite-actinolite, calcite and epidote, contain quartz-pyrite veins and fine-grained disseminated pyrite but rarely hosts quartz- molybdenite vein stockworks. These stockworks are more common in the biotite hornfelsed felsites where fine molybdenite flakes occur on the margins of fine quartz veins and as disseminations through silica-flooded zones.

Several generations of veining and fracturing in the pervasively silicified felsites are observed from the crosscutting relationships within the quartz-pyrite-molybdenite stockwork zone.

In the underlying intrusive rocks, molybdenite occurs in a few isolated quartz-pyrite veins and as a "paint" on a number of tight shear faces.

Assays from drill core are generally low (0.0x per cent), but a high of 0.156 per cent molybdenum across 3 metres was recorded (Assessment Report 7927).

In 1980, Bethlehem Copper Corporation completed a three holes diamond drilling program, totalling 775 metres.

Bibliography
EMPR AR 1966-77; 1968-104
EMPR ASS RPT 5772, 6129, *7927
EMPR BULL 9
EMPR EXPL 1975-E93; 1976-E108,E109
EMPR FIELDWORK 1977, pp. 23-25; 1989, pp. 503-510
EMPR GEOLOGY 1976, pp. 41-42
EMPR OF 1988-24; RGS 24, 1990
EMPR PF (In 092C General File - Aeromagnetic Contour Map, Nitinat Lake Area, Noranda Mines Ltd., date unknown; Claim map, topographic map and location map of percussin drill holes)
GSC MAP 1386A
GSC MEM 13
GSC OF 463; 821; 1272
GSC P 72-44; 76-1A; 79-30
Carson, D.J.T. (1968): Metallogenic study of Vancouver Island with emphasis on the relationships of mineral deposits to plutonic rocks, Ph.D. Thesis, Carleton University

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