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Location: 95 km SE from Detah, Northwest Territories, Canada
Suite 201, 4912 49th streetYellowknifeNorthwest Territories, CanadaNT X1A 1P3
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The mineral deposits at Thor Lake site include the Nechalacho deposit, and the separate and distinct R, S and T Zones, with the Nechalacho deposit bearing many of the attributes of an apogranite originating as an apical or domal facies of the parental syenite and granite. The deposits are extensively metasomatized with pronounced magmatic layering and cyclic ore mineral deposition. The main chemical features of the Nechalacho deposit that contrast to those overall features are that the rare earth levels are higher than typical, uranium is not particularly high, with anomalous but modest levels of thorium, and the lack of beryllium mineralization. Beryllium is present in the North T deposit, a separate smaller deposit to the north with dissimilar geology. The R, S and T Zones are small separate pegmatitic bodies to the north and northeast of the Nechalacho deposit.The preferred genetic model is that of igneous differentiation within a closed-system with rare earth element concentration within a residual magma, aided by depression of the freezing temperature of the magma by fluorine and possibly carbon dioxide.Nechalacho mineralization is hosted in nepheline syenite that has been extensively hydrothermally altered in areas of mineralization. The payable elements of the Nechalacho deposit are typically hosted in a number of minerals, summarized as follows:-LREEs dominantly occur in bastnaesite, synchisite, monazite and allanite.-HREEs dominantly occur in zircon, fergusonite and rare xenotime.-Zirconium (Zr), along with HREE, niobium and tantalum occurs in zircon and other zircono-silicates (eudialyte).-Niobium and tantalum occur in columbite and ferrocolumbite, fergusonite and zircon.
