The Top showing is underlain by rocks of the Upper Triassic and? Lower Jurassic Nicola Group. Mineralization comprises finely disseminated and fracture filling chalcopyrite, bornite, malachite, chalcocite and possibly digenite, found in a coarse volcanic breccia. This "augite porphyry" breccia is interbanded with some rhyolite and light-coloured flow rocks; some of the rhyolites are flow banded. The mineralization is proximal to a Triassic diatreme.

Values from grab samples range up to 4.3 per cent copper and 18 grams per tonne silver; the best values occurring when chalcopyrite, chalcocite or bornite are present. The best chip sample assayed 0.9 per cent copper and 3.8 grams per tonne silver over 1.4 metres (Assessment Report 13867, page 6).

Fragments in the volcanic breccia are predominantly porphyritic green and buff lava, chert, micrite and rhyolite, generally in a finer, clastic crystal fragment-bearing green matrix. The porphyritic green phase is the most common rock type and, in mineralized areas, it has been altered predominantly to calcite with 20 per cent albite and some chlorite, quartz and K-feldspar. Phenocrysts are altered to vermiculite-hydrobiotite with small amounts of chlorite, calcite and amphibole.

Away from the mineralized area, the volcanic breccia consists of sericitic to kaolinitic altered porphyry and clasts of altered microlitic volcanic flows. In this unit, relatively fresh augite phenocrysts are present. Apatite is often present in the chert and veinlets of quartz, K-feldspar and calcite are occasionally present.

South of the mineralized area, 1.5-metre green porphyry blocks are set in a fragmental green porphyry matrix. Occasional clasts are mineralized with copper and there are infrequent, well rounded, 5-centimetre diameter milled rock fragments.

To the north of the mineralized showing, outcrops in a narrow stream valley consist of "augite porphyry" and basalt breccia in faulted contact with a coarse conglomerate and interbedded calcite-cemented arkosic sandstone. The conglomerate and sandstone are cut by basaltic dikes; above is basalt-clast sandstone that grades upward into sandstone with plant fossils. It is suggested that the fault juxtaposes Triassic and Eocene Kamloops Group rocks.

The Top showing was first discovered by prospector D.J. Campbell of Peachland, in October 1980. Craigmont optioned the property shortly after, and during 1981 carried out 1094 metres of diamond drilling in 12 holes, 741 metres of percussion drilling in 17 holes and conducted a soil geochemical survey. In 1982, a 2-kilometre induced polarization survey was conducted and 575 metres of diamond drilling in 6 holes. Canamax optioned the property in 1983 and conducted a geochemical survey, geological mapping and hand trenching. In 1984, Canamax drilled 4 diamond-drill holes. Brican optioned the property in the fall of 1984 and completed 11 backhoe trenches totalling 556 metres.