The Lexicon (Lot 3303) claim is located on the lower slopes of Mount Attwood, 3 kilometres south of Greenwood. Access to the area is from Highway 3 via the Lind Valley road and an old logging road that skirts the northwest spur of Mount Attwood.

The area is underlain by limestone, greenstone and argillite of the Permo-Carboniferous Knob Hill Group. Early workings on the Lexicon claim consist of an 18-metre long adit exposing a flat-lying 2-metre wide band of massive pyrrhotite with garnetite and fine- grained chalcopyrite. East of the adit portal is an iron-stained capping, 30 by 9 metres, adjacent to granitic rock.

In 1968 and 1969, Ortega Minerals Ltd. conducted geophysical and geochemical surveys. A sample of chips assayed 0.83 per cent copper (Assessment Report 1648).