The ultramaphic rocks include Dunites, Harzburgites, lherzolites, Verlites and Pyroxenite
that transform into Serpentine due to the erosion under certain climatic conditions and oxidation environment.
In the Hosenbein pluton, possible textural and structural indicators for the palaeo-porous flow of intercumulus melts include (1) mottled texture (2) pyroxenite
aggregates, and (3) ferrodiorite dykes and patches.
These geophysical targets lie beneath glacial cover, however they are within a broad area of mapped mafic and ultramafic rocks where prospecting has identified local occurrences of nickel-copper sulphide mineralization associated with norite and pyroxenite
These were reported to have intersected high-MgO serpentinized peridotite, pyroxenite
and gabbro rocks, confirming the presence of prospective mafic-ultramafic rock types in the area.
The fluids changed the chemical composition and the environment of the rocks and resulted in mineral alterations, including the deposition of apatite in the pyroxenite
The deposit comprises a central iron rich breccia (subsequently mined out), surrounded by a pyroxenite
plug, into which carbonatite has intruded as a series of dykes and cone sheets.
Three of these locate on gabbro and pyroxenite
, one of which is spatially associated with a copper in soil anomaly located within the keel of plunging syncline in gabbro.
Graham (1917) and Poitevin and Graham (1918) proposed that the rocks of the Serpentinite Zone were comagmatic, and described several gradual contacts between pyroxenite
and gabbro at the Mill Hill section in the Asbestos igneous complex.
1), comprises gabbro, pyroxenite
, and relatively homogeneous harzburgites (mantle tectonite?
confirmed March 8th/08 the presence of substantial PGE mineralization associated with chromite layers in pyroxenite
The average Fe of 21% is typical for pyroxenite
, and during operations a mining engineer will be testing the head grade to ensure it meets the cut off grade.
The base ultramafic layer, pyroxenite
to serpentinite in composition, overlies the Chain Lakes massif (Fig.