The Arjay occurrence is located approximately 2.4 kilometres east of Sustut Lake.

Regionally, the area lies within the Stikine Terrane. The Stikine Terrane is an aggregate of allochthonous Paleozoic to Mesozoic magmatic arc assemblages and overlying sedimentary sequences (Monger, 1984). Volcano-sedimentary arc successions of the Permian Asitka Group and the Upper Triassic Takla Group are considered basement in the area. The overlying volcanic and sedimentary sequences belong to the Lower to Middle Jurassic Hazelton Group. Coarse clastic rocks of the Middle to Upper Jurassic Bowser Lake Group unconformably overlie the arc assemblages. The Bowser Lake Group is unconformably overlain by a continental clastic sequence, the Upper Cretaceous to Eocene Sustut Group.

The area lies west of the north-northwest trending Ingenika-Findlay fault, which separates the Stikine and Quesnel terranes. The area is bounded, to the east, by the north-northwest trending Moose Valley fault. Further west of the Moose Valley fault, the area is cut by numerous crosscutting thrust and normal faults. These strike northwest and northeast. The stratified rocks have undergone regional greenschist metamorphism and are cut by ultramafic to intermediate intrusives of Late Triassic to Cretaceous age.

Locally, the area is underlain by the Upper Triassic Savage Mountain Formation (Takla Group). The formation consists of augite porphyry basalt flow, breccia, pillow breccia, tuff and interbedded bladed feldspar porphyry. The area just north of Asitka Lake and the area east of Asitika Peak are intruded by Early Jurassic Asitka Peak quartz diorite stocks. Serpentinite has been mapped in the area.

Mineralization consists of native copper hosted in serpentinite and red volcanics.

Approximately 250 metres to the northeast, mineralization consists of chalcopyrite, bornite and chalcocite with associated pyrite and occasional tetrahedrite. These occur disseminated in shear zones and as replacements in favourable tuff horizons. A sample taken in 1962 across a 2.13-metre quartz vein, assayed 3.80 per cent copper and 27.43 grams per tonne silver (Assessment Report 475). The sampled vein is one of four parallel veins, which strike 85 degrees and dip 70 degrees to the north.

In 1991, Corona Corporation sampled the Arjay showing area, collecting 9 samples over about 300 metres distance. Five of the samples graded from 0.16 per cent to 0.3 per cent copper (Assessment Report 22018).

WORK HISTORY

In 1962, the first documented exploration in the area just east of Sustut Lake by consulting geologist G.L Holbrooke for W. Savage on the Arjay group of claims. Exploration yielded evidence of strong vein structures carrying copper mineralization (Assessment Report 0475).

The SIT claim group, staked in 1990 for Corona Corporation, includes the Sit 1 (242823, Sit 2 (242828, Sit 5 (242831), Sit 6 (242832) and Sit 7 (242833) claims. Geological mapping was performed 1991. Work included 25 man-days in the field, when 100 rock and 24 moss mat samples were collected (Assessment Report 22018). Corona Corporation prospected a large area between Asitka Lake on the south and Johanson Lake on the north. A number of earlier discovered showings and some new ones were visited.

See A4 (094D 087) for related geological and work history details.