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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 Tardiff deposit of the Tardiff Project is hosted near the top of a nepheline syenite intrusion, which is part of an anorogenic alkaline intrusive complex known as the Paleoproterozoic Blatchford Lake Igneous Complex. The rare earth element (REE) mineralization is hosted in hydrothermally-altered eudialyte syenite collectively referred to as the Upper and Basal zones, and the REE’s are mainly contained in the minerals bastnaesite-(cerium [Ce]), synchysite- (Ce), parasite-(Ce), fergusonite-(yttrium [Y]), samarskite-(Y), allanite-(Ce), and monazite-(Ce). Niobium (Nb) mineralization occurs within the REE Mineral Resource and is predominantly hosted in ferrocolumbite and fergusonite-(Y). There are multiple identified exploration zones (North T, South T, R zone, S Zone and Tardiff) within the mining leases of the Nechalacho Project. The Tardiff project currently only considers the Tardiff deposit, but it could expand to include the other geological zones with additional work. There is a defined geological subdivision between the predominantly LREO zone at the top (Tardiff, owned by Nechalacho Resources) and a mixture of light and heavy REO mineralization in the lower part (Nechalacho Basal Zone, owned by Avalon Advanced Materials). Tardiff is a polymetallic (REE, Nb, and zirconium [Zr]) deposit hosted by the Thor Lake Syenite. It is a large magmatic deposit with extensive overprinting alteration.REO mineralisation at Tardiff is layered in separate zones of light rare earths at the top of the deposit (Upper Zone) and a mixture of light and heavy REO mineralisation in the lower part of the deposit (Basal Zone). The current Tardiff MRE reported here is hosted within the upper zone and is dominated by LREO mineralisation. There are some trends in chemical and mineralogical characteristics in the Nechalacho deposit that have both geological and metallurgical significance. These trends are most apparent in vertical zoning of the deposit with respect to the proportion of heavy rare earth elements (HREE) and light rare earth. elements (LREE). In general, the HREE relative to the LREE show a distinct vertical zonation with increasing HREE to depth.The continuity of REE-mineralization is associated with hydrothermal alteration and mineralogical variations in precursor lithological units. Alteration assemblages of secondary potassium feldspar replacement of early syenite, the destruction of pre-existing mafic minerals and/or the pervasive replacement by magnetite+/-chlorite+/- biotite+/- zircon alteration assemblages are strong visual indicators for higher grade REE-mineralization. The Nb mineralisation broadly follows similar trends of REE mineralisation and variations in grade.Dimensions In plan, the Tardiff Mineral Resource extends approximately 1,900 m in the east-west direction and up to 800 m in the north – south direction. Vertically, the Mineral Resource lower limit is at the 150RL, below which Avalon has maintained ownership. The upper limit of the Mineral Resource is the contact between the Nechalacho Syenite and a layer of Glacial Till that may be up to 10 m in thickness.
