Granodiorites of the Cretaceous to Tertiary Coast Plutonic Complex are cut by numerous quartz diorite and quartz-feldspar porphyry dykes. Quartz veins up to 2 metres in width, occur along a 600 metre, northeast trend. They are concentrated mainly along faults and along felsic dyke margins. The wallrock is often schistose and contains sericite within about 25 centimetres of the vein margins.

The quartz veins are comprised of off-white to pale grey, glassy to locally granular quartz. Terminated, subhedral quartz crystals often line occasional vugs within the veins. Limonitic iron oxides often coat fracture surfaces within the veins.

Sulphide minerals within the quartz veins are pyrite, chalcopyrite, galena, sphalerite, tetrahedrite(freibergite) and stephanite with rare visible gold occurring in the Lucky Seven vein. Pyrite is the most abundant sulphide and occurs as disseminations within the veins; the other sulphides usually occur as irregular, discontinuous masses The mineralization is often concentrated near the vein margins. Chalcopyrite occurs as irregular masses up to 2 centimetres in diameter occasionally with malachite and/or azurite. Galena is present in several of the veins and locally, has been partly altered to cerussite(?). Several quartz veins contain siderite and minor calcite.

Sample TT-9, from a quartz vein with galena, pyrite and chalcopyrite near the old adits assayed 7.16 grams per tonne gold, 38.3 grams per tonne silver, 0.246 per cent lead, 0.03 per cent zinc and 0.015 per cent copper. Another sample taken from the dump pile at an old open cut assayed 0.695 grams per tonne gold, 99.5 grams per tonne silver, 2.533 per cent lead, 0.035 per cent zinc and 0.161 per cent copper (Di Spirito, 1986).

About 460 metres to the southwest of the old workings, a sample from a 4 metre wide quartz vein assayed 6.7 grams per tonne gold, 1049 grams epr tonne silver, 0.094 per cent lead, 0.032 per cent zinc, 0.024 per cent copper and 0.0012 per cent molybdenite (Assessment Report 13140).

In 1918, about 91 tonnes of ore from the Lucky Seven claim group produced 6,221 grams of gold.