The Nahlin River showing is located on the west side of the Nahlin River about 1.6 kilometres south of Chastot Creek, approximately 131 kilometres north of the community of Telegraph Creek.

Chalcocite and native copper are reported to occur in veins and stringers in upper Mississippian-Permian serpentinite of the Cache Creek Complex. Selected samples assayed better than 15 per cent copper; an adjacent band of mineralization is reported to have assayed 0.48 per cent nickel (National Mineral Inventory card).