The Lac Joubert Property (1,756 hectares) covers a regional scale NW-SE trending fault and associated deformation or shear zone through paragneiss (nAslm2) and metatexite derived from wacke (nAslm1a) of the Salomon River Formation. Pegmatites are documented to intrude both lithologies, and are likely Tilly Pegmatites (Atly), which are mapped to intrude the aformentioned lithologies extensively to the northwest of the property. Tonalite to Granodiorite with biotite and magnatite (Ajbt1) occur north and south of the Salomon River Formation, and iron formation (nAslm3) is found within it.

Non-intrusive lithologies are associated with the La Grande Subprovince, which hosts significant lithium deposits, include Corvette (~165 km WNW) and Adina (~69 km WNW). Numerous beryl occurrences are documented within the Tilly Pegmatites ~22-25 km west of the property, highlighting the potential of these pegmatites to host rare elements. The property occupies a similar structural setting to known lithium deposits (ie. Corvette, Adina), specifically, a major regional scale fault-shear zone ~20 km north of the subprovince boundary, which trends parallel or sub-parallel to the subprovince boundary.

A review of Sigeom geofiche outcrop descriptions yielded several features of interest in this area, as follows:

Geofiche Outcrop ID 383552: Described as intensely deformed paragneiss (M4) with possible spodumene?? noted within the outcrop description. Government maps show this is within a shear or deformation zone.

Geofiche Outcrop ID 383755: Described as a very large pegmatite outcrop with poikiloblastic garnets. Nearby pegmatites are described as being similar to this outcrop.

Geofiche Outcrop ID 383695: Muscovite (trace to 5%) noted in granite (I1B) and pegmatite (I1G). The presence of an unknown blue mineral (possibly apatite or beryl??) was also noted in the outcrop description.

Given the potential of pegmatites in La Grande Subprovince to host significant lithium deposits, these pegmatites warrant further exploration.

References:

Hammouche, H. and Burniaux, P. (2015) – CG-2015-02 Geologie Lac Joubert