The Old Yeller occurrence is located north of Glencairn Creek, at an elevation of approximately 1450 metres.

The area is underlain by quartzites and argillites of the Helikian Middle Aldridge Formation (Purcell Supergroup) and is contained within an east-west fracture zone, dipping 70 degrees south, which strikes across the axial plane of a large regional north east- plunging anticline.

Locally, an old pit, measuring 2 metres in size, exposes a limonite stained quartz breccia zone. Sulphide mineralization is not described, but is assumed to be similar to that of the St. Eugene (MINFILE 082GSW025) occurrence and consist of mainly pyrite, pyrrhotite and sphalerite.

In 2013 four samples (MK13-119 through MK13-1222) from the old pit and nearby dump material assayed from 0.006 to 0.033 per cent copper, 0.049 to 0.095 per cent zinc, 3.0 to 11.1 grams per tonne silver, 0.006 to 0.022 per cent cadmium, 1.19 to 2.14 per cent lead and greater than 0.02 per cent antimony (Assessment Report 34695).

The area has been historically explored in conjunction with the nearby St. Eugene (MINFILE 0820GSW025) mine. In 2006, Saint Eugene Mining completed 697 line-kilometres of airborne combined magnetic and electromagnetic surveys on the area. In 2011 and 2013, Kootenay Silver completed programs of geological mapping, rock sampling, a 500 line-kilometre airborne magnetic survey and a 500 line-kilometre seismic survey on the area as the Silver Fox property.