The Castledale occurrence is situated on the ridge between the Columbia and Spillimacheen rivers at a point 11 kilometres due west of the community of Parson. Considerable tunnelling was done on this property. In these workings the quartz vein does not show continuity and only a few small pockets of quartz mineralized with chalcopyrite were intersected (Minister of Mines Annual Report 1920, page N109).

The geology of the area is inferred from Geological Survey of Canada Map 1502A. In the Castledale occurrence area, Hadrynian Horsethief Creek Group sedimentary rocks are indicated. The group consists of shales and silty shales with thin interbeds of quartz siltstone and sandstone, limestone and dolomite, sandstone and quartz pebble conglomerate, and interbedded quartz sandstone and slate.