The Little Mamie (L.2830) occurrence is located several hundred metres north of the north end of Loon Lake and approximately 1.8 kilometres south-southwest of Ainsworth.

Regionally, the area is underlain by hornblende schists, limestone and banded quartzite of the Upper Mississippian to Permian Milford Formation and basaltic volcanic rocks of the Carboniferous to Permian Kaslo Group. Granodioritic intrusive rocks of the Middle Jurassic Nelson Batholith are exposed to the west.

The occurrence consists of a thin, cavernous quartz vein along the footwall of a lamprophyre sheet. Ore mineralization is lean at surface, but intersections of as much as 60 centimetres of 30 per cent galena and sphalerite were obtained in drillcore. The rocks are described as mica schist, micaceous quartzites and limestone of the Mississippian to Permian Milford Formation.

A shipment of 10 tonnes of ore was made in 1921, from which 17 107 grams of silver and 4989 kilograms of lead were recovered.

Work History

Historical workings, dating to the late 1800s and/or early 1900s, include a shaft and three adits, one of which connects to the shaft. A shipment of ore was made in 1921.

In 1979, David Minerals Ltd. conducted a program of geochemical (stream and silt) sampling on the area as the Peanut Butter claims of the Ainsworth property. In 1980, Dragoon Resources Ltd. conducted a program of geological mapping and a 3.5 line-kilometre ground electromagnetic survey on the area immediately to the west as the Peanut Butter 1 claim.

In 2012, David Wallach prospected and rock sampled the area as the Ainsworth property. An undescribed rock sample (1986630) from the occurrence area yielded 0.18 per cent copper, greater than 1.00 per cent zinc and lead, each, and greater than 100 grams per tonne silver (Assessment Report 33426).

In 2021, a 24.0 line-kilometre airborne (drone) magnetic survey was conducted on the area by Taylor Lorenzen.