The Grand Solo occurrence is located at 1770 metres elevation above sea level near the head of Mobbs Creek, 2 kilometres west of Tenderfoot Lake, in the Slocan Mining Division.

Regionally, the area lies within the Selkirk Mountains of southeastern British Columbia. The occurrence is within the Kootenay Arc, a curving belt of highly deformed metasedimentary and metavolcanic rocks which includes the Upper Proterozoic Horsethief Creek Group, the Upper Proterozoic to Lower Cambrian Hamill Group, the Lower Cambrian Badshot Formation, and the Paleozoic Lardeau and Milford groups. The volcano-sedimentary sequence is intruded by numerous Paleozoic to Mesozoic granitoid plutons.

The Tenderfoot Lake area is mainly underlain by the Mesozoic Mobbs Creek and Rapid Creek quartz monzonite stocks and the Early Jurassic Kuskanax monzonite batholith to the west. Grey quartz mica schist of the Broadview Formation along with marble, micaceous schist and amphibolite of the Paleozoic Milford Group form tightly folded rafts between the stocks and the batholith. The rocks have undergone contact and regional metamorphism to middle or upper greenschist facies (Geological Survey of Canada Bulletin 193).

The occurrence consists of a 60 to 120 centimetre wide quartz vein mineralized with galena, sphalerite and argentite. The vein is hosted within micaceous schist of the Milford Group. It has been explored with a 45 metre long adit and surface trenches. Three short adits down the hill expose a quartz vein 20 to 30 centimetres wide which may correlate with the upper vein. The vein exposed in the lower adits is mineralized with galena and carries silver values. The wallrock is silicified and the quartz vein is brecciated. A 45 centimetre channel sample of the mineralized vein in the upper adit assayed 3290 grams per tonne silver, 6.4 per cent lead and 0.85 per cent zinc (Assessment Report 916).

The occurrence may be on the same vein as the Ruby Silver occurrence (082KSW114), one kilometre to the southeast.