The Anvil Molybdenum occurrence is located approximately 11 kilometres west of the Blue River, near Chromite Creek, about 128 kilometres north of the community of Dease Lake.

A two-metre-wide biotite granodiorite dike cuts ultramafic rocks of the Permian Blue River Ultramafite (Slide Mountain Complex) in the Tournaisian (lower Early Mississippian) to Permian(?) Sylvester allochthon and is paralleled by a 0.5 metre wide quartz vein, exposed along strike for 100 metres. The vein contains scattered molybdenite, generally less than 1 per cent, and has a strike of 060 degrees and dips 80 degrees northeast. The dike emanates from the Early Cretaceous granitic Cassiar batholith.