The M-3 occurrence is located near a group of small lakes in a northeast-facing valley, south of Lamb Mountain.

Regionally, the area is underlain by a north to north-northwest–trending series of sedimentary rocks, dipping approximately 70 to 80 degrees to the northeast, and comprised of undivided sedimentary rocks of the Neoproterozoic Stelkuz Formation (Ingenika Group), quartz arenite sedimentary rocks of the Lower Cambrian Boya Formation (Atan Group), calcareous sedimentary rocks of the Lower Cambrian Rosella Formation (Atan Group), limestone, slate, siltstone and argillite of the Cambrian to Ordovician Kechika Group and Ordovician to Silurian Road River Group, quartz arenite sedimentary rocks of the Silurian to Lower Devonian Ramhorn Group and calcareous sedimentary rocks of the Devonian McDame Group. The sedimentary units have been locally intruded by an Upper Cretaceous (Lamb Mountain) quartz monzonite porphyry intrusive, while granitic rocks of the Lower Cretaceous Cassiar Batholith are exposed to the west.

Locally, pods of sulphide-bearing (pyrrhotite, chalcopyrite and scheelite) actinolite-garnet skarn are hosted in a marble at or near its contact with a quartz monzonite intrusive.

In 1979, a chip sample is reported to have yielded 0.11 per cent tungsten tri-oxide over 4.6 metres (Assessment Report 7965).

In 2011, a sample (5214043) of strongly altered limestone in contact with an intrusive from the occurrence area assayed 4.99 grams per tonne gold, 0.356 per cent bismuth and 0.26 per cent copper (Assessment Report 32461).

Work History

The area has been explored in conjunction with the Lamb Mountain (MINFILE 104P 003) prospect, 2.2 kilometres to the north-northeast, and a complete exploration history can be found there.