The JS occurrence is located on a ridge east of the headwaters of Askew Creek, approximately 1.6 kilometres west of Chemainus Lake.

Regionally, the area is underlain by chert, siliceous argillite and siliciclastic rocks of the Mississippian to Pennsylvanian Forth Lake Formation (Buttle Lake Group) and calc-alkaline volcanics of the Devonian Nitinat Formation (Sicker Group). Gabbroic to dioritic intrusive rocks of the Late Triassic Mount Hall Gabbro intrude the previous formations.

Locally, a number of zones of siliceous pyritic basalts and feldspar porphyry dikes host chalcopyrite, sphalerite and galena mineralization. A nearby shear zone hosts quartz veining and up to 10 per cent pyrite-galena-magnetite-chalcopyrite mineralization.

Work History

In 1982, the area was prospected as the JJ and JS claims by J.W. Joyce. A sample of mineralized material assayed 0.29 per cent copper, 0.528 per cent zinc and 17.2 grams per tonne silver (Assessment Report 12048).

During 1984 through 1986, BHP-Utah Mines completed programs of geochemical (rock, silt and soil) sampling, airborne and ground geophysical surveys, geological mapping and 16 diamond drill holes, totalling 6317 metres, on the JRM claims. A rock sample (JRM-36) from the shear zone assayed 0.53 per cent zinc (Assessment Report 12788).