The Boomerang occurrence is located south of Enterprise Creek and northeast of Heather Lake, in Kokanee Glacier Provincial Park.

The area is underlain by granodioritic intrusive rocks of the Middle Jurassic Nelson Batholith.

Locally, a narrow, up to 5-centimetre wide, mineralized quartz vein is hosted by a potassium-feldspar porphyritic granite. Mineralization is sparse but includes galena, light-coloured sphalerite, pyrite and reported native silver. Zones of argillic alteration, limonitic weathering and, locally, silicification occur adjacent to the main fault fissure. The vein strikes north-south and dips approximately 80 degrees eastward.

In 1987, a sample of vein material assayed 8.0 grams per tonne silver, 0.08 gram per tonne gold, 0.025 per cent lead and 0.073 per cent zinc (Open File 1988-11).

In 1956, 3 tonnes of ore yielded 4.479 kilograms of silver, 123 kilograms of zinc and 121 kilograms of lead.

The vein has been developed and explored by two adits (Upper and Lower), 25 and 45 metres long, and a small stope dating to the early 1900s.