Stonewall is centered on an approximately 1.2km long (open along strike) milky-white quartz vein with prevalent low-sulphidation epithermal boiling textures, which varies in thickness between 15-20m along its outcropping extent.

Rock sampling by previous operators returned anomalous gold-silver values (up to 1.17g/t Au and 161g/t Ag) with elevated mercury, which is characteristic of the shallow parts of a low-sulphidation epithermal system.

Minimal shallow historic drilling tested a limited strike length along the vein and returned downhole epithermal quartz vein intersections up to 12m in width with stockwork zones up to 70m wide with elevated gold and silver results. Drilling was completed along parts of the vein easily accessible for a road, with the zones displaying the strongest epithermal textures remaining untested.