The Moonlight Glacier 3 showing is located about 100 metres east of American Creek and 600 metres southeast of the toe of the Moonlight Glacier, 32 kilometres north of Stewart. The Moonlight Glacier is a tongue that extends eastwards from the Betty Glacier about 15 kilometres north of the confluence of American Creek with the Bear River.

The area is underlain by north-northeast trending, east dipping Lower Jurassic rocks of the Unuk River Formation (Hazelton Group). These lie on the east limb of the American Creek anticline (Bulletin 58; 63).

The showing comprises a north(?) trending, east dipping silicified shear zone in lithic greywacke. Mineralization consists of pyrite, arsenopyrite, pyrrhotite and minor tetrahedrite. In 1989, a chip sample across 0.6 metre assayed 2390 grams per tonne silver and 2.51 grams per tonne gold with negligible copper, lead and zinc values (Assessment Report 19746). In 1992, a 20 centimetre rock chip sample (Rich 3) assayed 168 grams per tonne silver, 1.2 grams per tonne gold and 626 parts per million antimony (Assessment Report 22890).

The early history of the showing is unknown. It may have been covered by the Camp, BLK, Bryant and Dundee claim groups staked by Bryant, Little and Kimball in 1929. In 1988, D. Cremonese conducted a heli-borne VLF-EM and magnetometer survey over the area. In 1989, White Channel Resources Inc. carried out a program of geological mapping, prospecting and sampling, silt and soil geochemical surveys, and ground VLF-EM and magnetometer surveys on the Rich 1-4 claims. The showing was reported at this time on the Rich 3 claim. There are two other showings on the Rich 3 claim: the Moonlight Glacier 1 (104A 120) and the Moonlight Glacier 2 (104A 121). In 1992, White Channel Resources Inc. carried out a program of geological mapping, linecutting and VLF-EM and magnetometer surveying to assess the mineral potential of the upper Moonlight Glacier. Two grids were established over mineralized areas.