The Kalappa occurrence is located near the eastern shore of Lemmens Inlet on Meares Island.

The area is underlain by amphibolite, agmatite, hornblende-plagioclase gneiss and quartz diorite of the Mesozoic- Paleozoic Westcoast Complex. A northwest elongated quartz diorite stock of the Early to Middle Eocene Tofino Intrusive Suite (formerly Catface Intrusions) lies 2.0 kilometres to the west on the west side of Meares Island. Granodiorite of the Early to Middle Jurassic Island Intrusions lies 3.0 kilometres east of the occurrence.

The Westcoast Complex has been intruded by a 180 by 200 metres wide explosive breccia that contains fragments of the host rocks, metavolcanics, hornfels, dacite and quartz. The breccia contains disseminated arsenopyrite and a stockwork of vuggy quartz veinlets. Float samples of the breccia assayed up to 1.99 grams per tonne gold and 11.49 grams per tonne silver (Assessment Report 13556, page 28).

Five sulphide-bearing structures, striking 140 to 170 degrees and dipping steeply northeast, are present. These structures, up to 1 metre wide, consist of siliceous breccia, composite veins or sheared veins and gouge, and contain disseminated to massive pyrite and pyrrhotite, with local arsenopyrite, chalcopyrite, sphalerite and galena. Electrum is associated with chalcopyrite and arsenopyrite, and galena carries native bismuth, unidentified silver minerals and gold. Minor disseminated sulphides are present in the Westcoast Complex host rocks near the structures.

Samples from the Number 3 adit, driven on one of the vein-structures, contained up to 24.28 grams per tonne gold over an average width of 0.42 metre along a strike length of 6.0 metres (Assessment Report 13556, page 22). Samples of selected massive sulphide material assayed up to 43.62 grams per tonne gold and 195.11 grams per tonne silver over 0.4 metre (Assessment Report 13556, page 26, sample number 7063).

The area was first explored in the early 1890's, in conjunction with the nearby Iron Cap deposit (092F 158). From 1913 to 1914, development work included roads, ore bunkers, 60 metres of raises and 180 metres of drifting along with five shipments of ore to the Tacoma Smelter. In 1913 and 1914, 1372 tonnes of ore were mined producing 17,697 grams of gold, 110,229 grams of silver and 27,380 kilograms of copper. The property remained dormant until the 1950's and in the 1968 Fort Reliance Minerals optioned the Kalappa Group and carried out programs of geochemical sampling, geological mapping and prospecting. In 1984, Iron River Resources acquired the property.