The Yankee Girl occurrence is located near the north shore of Rupert Inlet and a short distance southeast of the Island Copper (MINFILE 092L 158) mine.

The area is underlain by Lower Jurassic Bonanza Group volcanics and sediments, intruded by rocks of the Upper Jurassic Island Plutonic Suite.

Locally, sheared and intensely shattered andesite on Red Island is mineralized with pyrite, chalcopyrite and magnetite as disseminations and fracture coatings. Silicification accompanies the mineralization with the development of numerous cryptocrystalline quartz stringers. Two fracture/shear directions are indicated at 150/80W and 050/80N (Assessment Reports 710,731).

Where well-sheared and silicified, copper values may average one per cent across 9 metres, iron content of the altered andesite might average fifteen per cent (Assessment Report 710).

Work History

The area has been explored in conjunction with the nearby Island Copper (MINFILE 092L 158) mine and a complete regional exploration history can be found there. During the 1960s through 1980s, BHP-Utah Mines completed programs of geological mapping, geochemical sampling, airborne and ground geophysical surveys and diamond drilling on the area.