The Davis occurrence is located on the south side of Gerald Creek, approximately 1.7 kilometres south east of Gerald Lake.
The area is underlain by Upper Triassic Vancouver Group, Karmutsen volcanics comprised of a thick sequence of tholeiitic basalts. The base of the Karmutsen Formation is comprised of a sediment-diabase sill unit (Middle Triassic (?) in age), which separates the Vancouver Group rocks from the underlying Paleozoic Sicker Group.
Locally, the occurrence is underlain by the sediment-sill unit that has been divided into three sub-units. The sill unit consists of rhyolite, quartz-porphyry and diorite and a sedimentary unit contains argillite, chert, minor greywacke and siltstone. The third sub-unit consists of a 50 metre wide limestone band. A major west-northwest trending fault along Gerald Creek separates the sediment-sill unit on the south side from pillow basalts, breccia and flows of the Karmutsen Formation to the north. Vertical displacement along the fault is believed to be at least several hundred metres (Assessment Report 13836).
The occurrence consists of hydrothermal quartz and quartz-siderite veins and mylonitic shear zones in andesite and silicified andesite. Two mineral assemblages are recognized:
The first, consisting of copper-silver, occurs in a 2.5 metre wide quartz vein in a mylonized zone between two 30 centimetre shear zones. Minerals recognized are chalcopyrite, pyrite, covellite, galena and malachite. In 1985, a chip sample over 0.5 metre assayed 2.42 per cent copper and 20.0 grams per tonne silver; while previous grab samples yielded up to 15.1 per cent copper, 2.45 per cent lead, 5.47 grams per tonne gold and 115 grams per tonne silver (Assessment Report 13836, page 13).
In 1989, drill hole 89-5 intersected the mineralized quartz vein yielding:
Sample No. Intercept Copper Silver Gold
(metres) (per cent) (g/t) (g/t)
61345 0.4 to 1.8 >1.0 21.4 N/A
61346 1.8 to 3.0 6.5 50.1 0.21
61347 3.0 to 4.2 4.1 32.9 0.14
(Assessment Report 19452).
In 1990, drill hole 90-5 located a faulted extension of the main vein to the south, at a depth of 64.9 to 65.6 metres, yielding 1.86 per cent copper over 0.7 metres (Assessment Report 20075)
The second assemblage is gold-arsenic, occurring in quartz veins and lenses up to 0.5 metres wide. In 1985, a channel sample assayed 1.3 grams per tonne gold and 3.6 per cent arsenic (Assessment Report 13836, page 13).
In 1996, two float samples of massive sphalerite taken from a ridge, approximately 1 kilometres to the south west, yielded greater than 1 per cent zinc and up to 254.8 grams per tonne silver (Assessment Report 24946).
In 1968, Falconbridge completed a program of geological mapping, soil sampling and ground geophysical surveys on the area as the Davis claim. In 1984 and 1985, Falconbridge completed programs of geochemical sampling, geological mapping, an airborne geophysical survey and 4 diamond drill holes on the area as the Golden claim. During 1988 through 1989, Doromine Resources completed programs of rock sampling, geological mapping, trenching and 21 drill holes, totalling 1572 metres, on the area as the Bruno property. In 1996, First Choice Industries completed a two day program of prospecting the area immediately to the west as the GER 1-6 claims.
