The NW occurrence is located along the edge of the Nahlin River, about 1.5 kilometres from its confluence with Dudidontu River, approximately 130 kilometres north of the community of Telegraph Creek.

The showing area is underlain by argillite, greywacke and tuff of the Mississippian-Triassic Kedahda Formation (Cache Creek Complex). Feldspar porphyry is also evident.

A large, angular block of serpentinite weighing several tonnes is evident along the edge of Nahlin River. The serpentinite is strongly fractured and cut by a network of asbestos veinlets. Cross-fibre asbestos (probably chrysotile) constitutes 7 to 12 per cent of the rock mass. The fibres vary from about 1 to 6 millimetres in length. The angular character of the float suggests it is not far removed from its source. Geological Survey of Canada Open File 707 indicates that upper Mississippian-Permian ultramafic bodies of the Cache Creek Complex are nearby.

In 1957, Consolidated Northland Mines Limited conducted prospecting and geological mapping.