The Kalappa occurrence is located on Enterprise Creek, approximately 500 metres from its mouth into Slocan Lake. Silverton, British Columbia lies 10 kilometres to the north-northeast.

The Kalappa occurrence is hosted along the Eocene Slocan Lake fault. The east dipping normal fault separates foliated potassium feldspar porphyritic granite of the Middle Jurassic Nelson batholith from leucocratic biotite quartz monzonite to granite of the Paleocene Valhalla Complex. Locally, this granite is referred to as the Ladybird granite. Younger rhyolite and andesite dikes intrude along the fault. The fault zone is 100 to 800 metres wide composed of 20 centimetre or less spaced brittle fractures and faults with lower to middle greenschist retrograde alteration. Granitic rocks of the Nelson batholith in the hangingwall are variably altered to clay-limonite, local quartz stockwork and zones of pyritization. The Ladybird granite is foliated and mylonitic. Older metasediments in the footwall show little retrograde or hydrothermal alteration.

The Kalappa occurrence consists of an altered and mineralized quartz stockwork to vein, striking 030 degrees and dipping 32 degrees to the southwest. Alteration consists of variable argillic and silicification restricted to the lode structure. The lode strikes 015 degrees and dips 35 degrees southeast.

Mineralization is composed of massive stibnite and pyrite. Ten kilometres further south along the Slocan Lake fault, sample J-74 taken from a fault-hosted quartz vein contained tetrahedrite and possibly native silver. Sample JL-200, a grab sample taken from a quartz vein on this occurrence, yielded 23.0 grams per tonne silver, 0.97 gram per tonne gold, 0.0072 per cent copper, 0.0040 per cent lead and 0.0088 per cent zinc (Open File 1988-11).