The Pen showing is about 12 kilometres northwest of Greenwood and 4 kilometres northwest of Copper Mountain. It lies south of Wallace Creek. Access to the property is by road from Highway 3, along the Boundary and Wallace creeks. The Mabel- Jenny showing (082ESE203) lies about 3 kilometres to the southwest.

The claims are underlain by Upper Paleozoic Knob Hill Group argillite, greenstone, and chert. The Knob Hill is locally overlain by the sharpstone conglomerate and limestone of the Triassic Brooklyn Group and arkose and tuffs of the Eocene Kettle River Formation (Penticton Group). Intrusive rocks include granodiorite on the Middle Jurassic Nelson Batholith and syenite and diorite of the Eocene Coryell Intrusives.

A copper-zinc skarn occurs in Brooklyn limestone. In 1970, trenching exposed a garnet-pyroxene skarn pod 9 by 3 metres which contains pyrite, pyrrhotite, sphalerite and chalcopyrite. Three, 3-metre samples averaged 0.125 per cent copper, 27.5 grams per tonne silver, and over 1 per cent zinc. Drilling failed to intercept significant mineralization (Assessment Report 5842). A garnet-pyroxene-wollastonite skarn north of Wallace Creek (1.6 kilometres northeast of the Pen showing) contains minor sphalerite, pyrrhotite, pyrite and chalcopyrite.

The showing was discovered by R.J. Forshaw in 1969. In 1970, Orequest trenched and drilled the showing. During 1975 through 1978, Rio Tinto Canadian Exploration Limited explored the area with geological mapping, geophysical surveys, soil geochemistry and two diamond drill holes. In 1990 and 1991, Canamax Resources Inc. conducted geological mapping, soil sampling and rock chip sampling. During 2008 through 2012, Grizzly Discoveries Inc. completed programs of geochemical sampling, geological mapping and ground geophysical surveys on the area as the Greenwood property.