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File Created: 05-Dec-1994 by George Owsiacki (GO)
Last Edit:  30-Jul-1997 by Keith J. Mountjoy (KJM)

Summary Help Help

NMI
Name JI, ROAD SHOWING, SAUMAREZ BLUFF Mining Division Vancouver
BCGS Map 092G081
Status Showing NTS Map 092G13W
Latitude 049º 52' 01'' UTM 10 (NAD 83)
Longitude 123º 56' 36'' Northing 5524264
Easting 432208
Commodities Copper, Lead, Silver Deposit Types I06 : Cu+/-Ag quartz veins
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks, Gambier
Capsule Geology

The JI showing is located between Saumerez Bluff on the west side of Jervis Inlet and Freil Lake, about 88 kilometres northwest of Vancouver, British Columbia.

The JI property is underlain by at least two and possibly three narrow northwesterly trending roof pendants of Lower Cretaceous Gambier Group volcanic and sedimentary rocks surrounded by granodiorite to quartz monzonite of the Jurassic to Cretaceous Coast Plutonic Complex. Metamorphic rocks are generally of upper greenschist to amphibolite grade, consisting of gneiss, schist, quartzite and amphibolite. The Gambier Group rocks comprise fine grained andesitic and tuffaceous metavolcanics with interbedded chlorite-altered siltstone and cherty argillite. Bedding generally strikes northwest with steep dips to the northeast and southwest. Stockworks of quartz and quartz-hematite occur locally.

Alteration within this package is a propylitic assemblage comprising epidote and chlorite occurring as narrow veinlets and disseminations. Pyritic diorite and quartz diorite bodies intrude the volcanic-sedimentary rocks. Quartz trachyte, latite, porphyritic andesite, quartz monzonite, feldspar porphyry and pebble dikes intrude both Gambier Group and Coast Plutonic Complex rocks.

Rock units identified at the JI showing include felsite, andesite tuff, a transitional unit between felsite and andesite tuff, diorite, granodiorite and feldspar porphyritic andesite to basalt and felsite dikes.

At the Road showing, mineralization consists of abundant vein- hosted pyrite with local concentrations of chalcocite in a shear in a diorite intrusion adjacent to a 6 metre wide feldspar porphyry dike. The vein can be traced for 4 metres at the Road showing which is also marked by a strong 11-metre wide gossan marking the contact between andesitic tuff and fine-grained diorite.

Initial select prospect grab samples analysed 3.25 per cent copper but could not be duplicated by more representative chip samples (Assessment Report 23229, page 14). Representative samples have not been able to duplicate these results (Assessment Report 23896). However, grab sample 54236 taken in 1994, yielded 0.17 per cent copper. The sample was taken from fine-grained diorite with strong limonite alteration, 10 per cent disseminated and stringer pyrite and 5 per cent magnetite (Assessment Report 23896). Another grab sample (54253) yielded 0.12 per cent lead and 11.3 grams per tonne silver from interbedded, epidote-chlorite altered, argillite and tuff with pyrite, magnetite and hematite. The mineralization appeared fracture controlled.

Property exploration in 1994 has extended soil geochemistry copper anomalies northwest and southeast. These elevated copper values (greater than 300 parts per million) often lie parallel or downslope of andesite tuff-felsite flow contacts. Northwest trending zones of high chargeability are often coincident with or directly upslope of strong soil copper anomalies. Moderate to strong resistivity lows correspond to chargeability highs.

Bibliography
EMPR ASS RPT *23229, *23896, 24973
EMPR BULL 60
EMPR PF (R.H. McMillan, Mineral Potential Report of the Pilldolla and JI properties, 1994; Regional Geologist's notes, 1994/95; photos, 1996)
GSC MAP 42-1963; 1069A; 1386A
GSC OF 611
GSC P 90-1F, pp. 95-107

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