The Ruby Creek occurrence is located on Ruby Creek, which enters the Finlay River 24 kilometres north of the Fishing Lakes, about 238 kilometres northwest of the community of Germansen Landing.

The showing occurs within the western part of the Kechika Trough, a southward extension of the Selwyn Basin in the Omineca Belt. Regionally, the area surrounding the showing is underlain by fault-bound blocks of Upper Proterozoic or Lower Paleozoic strata comprising the Neoproterozoic Ingenika Group, Lower Cambrian Atan Group and the Cambrian to Ordovician Kechika Group. These strata are usually separated by continuous faults and fault zones trending parallel to the Rocky Mountain Trench, and marked by zones of cataclasis and by linear valleys. Upper Cretaceous to Tertiary conglomerates of the Sifton Formation are found along the Spinel fault zone. The structural style and degree of metamorphism show significant differences between these fault-bound panels. The age of metamorphic strata (to kyanite grade) in the block between the Pelly and Ridgeway faults on the west and the Kechika fault on the east, including the Sifton Range, is not fully resolved (Geological Survey of Canada Paper 77-1A, pages 243-246).

Lower Cambrian and Ordovician strata of the Atan and Kechika groups are exposed in the Ruby Range, where the Ruby Creek showing is located. The Kechika Group consists of limestone, phyllite, and calcareous shale. The Atan Group is composed of limestone, siltstone, dolomite, quartzite, shale, sandstone and conglomerate (Assessment Report 8984). The showing consists of a quartz vein, up to 76 centimetres wide, mineralized with pyrite and chalcopyrite. The vein is located a few kilometres east of a large body of Early Jurassic granodiorite (Pitman batholith). The occurrence, although of low grade, is reported to be of considerable size (Geological Survey of Canada Summary Report 1927, Part A, page 38A).