The Cassiar Moly West occurrence is located on an east-west–trending ridge, south of Lang (Bass) Creek and approximately 7.5 kilometres west of the south end of Vines Lake.

Regionally, the area is underlain by alkali-feldspar granitic intrusive rocks of the Lower Cretaceous Cassiar Batholith.

Locally, the area is underlain by a quartz monzonite stock, at the eastern margin of the Lower Cretaceous Cassiar Batholith. Intrusive phases include a pink megacrystic porphyry, a coarse-grained porphyry, a grey porphyry and a finer-grained equigranular leucocratic quartz monzonite. All textural variants have gradational contacts. Alaskite, aplite and quartz-feldspar porphyry dikes and segregations occur throughout.

Molybdenite occurs as small rosettes and flakes in the fine-grained intrusions and in fractures and joints with pyrite within quartz-feldspar porphyries and adjoining megacrystic porphyries.

In 1967, a chip samples yielded 0.48 per cent molybdenite over 1.2 metres (Assessment Report 1700).

In 1979, three samples (VII, VIII and IX) yielded from 0.23 to 2.91 per cent molybdenite (Assessment Report 8009).

Work History

The area has been explored in conjunction with the nearby Cassiar Moly (MINFILE 104P 035) deposit and a complete exploration history can be found there.