The M12000 Road (Clone 4) occurrence is located east of the Manson River, approximately 6.5 kilometres northeast of the river’s junction with Munro Creek.

The area lies within the Omineca Crystalline Belt, which consists of siliciclastic sediments with minor carbonates and mafic rocks. These rocks belong to the late Proterozoic Ingenika Group. Within the Wolverine Range, the sediments are highly metamorphosed and subsequently intruded by granodioritic bodies and associated pegmatites, which are most likely Early Tertiary. The Proterozoic Wolverine Complex rocks consist of amphibolite and calcsilicate gneiss, schists, micaceous quartzite and crystalline limestone.

The occurrence is underlain by a 150-metre wide zone of diorite to quartz diorite intrusive rocks is hosted in highly deformed, locally migmatized, garnet-biotite-sillimanite clastic metasedimentary rocks of the Wolverine gneisses. The main rock types of the mineralized zone comprise lineated, diopside-hornblende quartz diorite and lighter weathering, more leucocratic, titanite-diopside quartz diorite. The latter rock type grades into quartzrich patches and veins that contain identical mineralogy to its host. Aggregates rich in yellow-green hornblende occur in some of the quartz-rich patches in association with orange titanite, plagioclase and sparse allanite.

The rare-earth element mineralization is concentrated in calcium-rich masses within a quartz-rich, calc-alkaline pegmatite system that post-dates the deformation of its diorite to quartz diorite host rocks. A 2 to 3-metre wide light green replacement zone, characterized by an increase of diopside over hornblende, is symmetrically disposed along the 0.5 metre thick pegmatite veins. Several of these quartz-rich pegmatite vein systems and attendant diopside-rich halos have been observed within the diorite host-rocks.

The mineral assemblage of the rare-earth element mineralized domains in the pegmatite system consists of deep brown, non-metamict allanite, vesuvianite, scheelite, two varieties of epidote (pink and pistachio green), fluorapatite and sparse zircon. Elevated Y2O3 contents were also documented in several minerals.

In 2007, a sample (926529) from the allanite-bearing assemblage of the quartz-rich calc-alkalic pegmatite yielded elevated total REE contents of up to 0.146 per cent with yttrium values up to 0.0124 per cent and total HREE values of up to 0.0123 per cent, while epidote, titanite and vesuvianite reveal enrichment in Y2O3 up to 3.5 weight per cent (Breaks, F.W. (2009-11-10): Geological Report on the Mount Bisson Rare-Earth Element Claim Group).

During 2006 through 2011, Paget Minerals completed programs rock and silt sampling, geological mapping and a combined airborne magnetic and radiometric survey, totalling 564.4 line-kilometres, on the area as the Mount Bison property.