The Ace occurrence is located just west of Tedideech Lake, between the lake and the Koshin River, approximately 100 kilometres north of the community of Telegraph Creek.
The showing is underlain by limestone of the Permian Teslin Formation (Cache Creek Complex) and argillite, greywacke and chert of the Mississippian-Triassic Kedahda Formation (Cache Creek Complex). Isolated specks of pyrite and chalcopyrite occur in an unnamed Triassic-Jurassic feldspar porphyry.
In 1957, Consolidated Northland Mines Limited conducted prospecting and geological mapping.