The June occurrence is located on the south western side of Matchlee Bay, approximately 1.2 kilometres north west of the mouth of the Burman River and at an elevation of 150 metres.
The Muchalat Batholith of the Jurassic Island Plutonic Suite intrudes volcanics of the Upper Triassic Vancouver Group Karmutsen Formation. The volcanic rocks have been amphibole and hornfels altered near the contact, overprinting regional zeolite facies metamorphism.
Locally, four quartz-sulphide veins are hosted by andesite. Three sub-parallel veins strike approximately 270 degrees and dip vertically. These veins are cut by a fourth vein that strikes 312 degrees. The main vein is a well-defined shear zone from 2 centimetres to 2 metres wide. It has been exposed in an underground drift for 36 metres and in pits 150 metres to the west. The shear zone is strongly silicified and consists of fine-grained dark quartz mineralized with pyrrhotite, chalcopyrite and small amounts of galena, magnetite, arsenopyrite and matildite. A few stringers of white, later quartz cut the shear zone.
An average assay of 9 samples, taken from the shear zone, is 24.68 grams per tonne gold, 226.24 grams per tonne silver and 2.9 per cent copper over an average width of 0.49 metres (Slocan, 1946, page 3). In 1977, sampling of the tunnel yielded values up to 23.05 grams per tonne gold, 230.8 grams per tonne silver, 4.68 per cent copper, 0.70 per cent lead and 0.33 per cent zinc over 36 centimetres (sample 16211; Assessment Report 6415). In 1986, a 30 centimetre chip sample (4494) of mineralized quartz vein assayed 38.6 grams per tonne gold and 406.8 grams per tonne silver (Assessment Report 14981).
Another quartz vein, also hosted by andesite, is located approximately 150 metres east of the main workings. The vein is 12.5 to 15 centimetres wide and strikes north 48 degrees west and dips vertically. It has been traced for over 15 metres. A sample (No.25) of the vein assayed 0.7 gram per tonne gold, 27.4 grams per tonne silver and 0.5 per cent copper over 15 centimetres (Ministry of Energy and Mines Annual Report 1946-179).
The area was originally staked as the June Group in 1939 and later the same year sold to Burman River Gold Mines. During 1940 through 1942, work on the main drift was completed. In 1968, the area was staked and explored as the Cu group. In 1977, Adola Mining completed a program of geological mapping, soil sampling and a ground magnetometer survey on the area as the Adola claims. In 1986, Adola completed another program of soil sampling and ground geophysical surveys on the area.
