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Location: 130km SW from Halls Creek, Western Australia, Australia
Level 1, 338 Barker RoadSubiacoWestern Australia, Australia6008
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The Cummins Range pipe is a phosphorous-rare earth rich system with phosphorous and rare earths mineralisation found in variable quantities over the entire pipe. Drilling in the north-western portion of the pipe is the focus of this MRE. The Cummins Range deposit is centred around two sub-parallel carbonatite dykes (Rare Dyke and Phos Dyke) that strike at 320 degrees and dip at 60 degrees to the south-west. The Rare Dyke and the Phos Dyke have intruded into the clinopyroxenite forming large apatite rich carbonatised alteration holes. Within the carbonatites and wall rock alteration zones are monazite-bastnaesite-parisite rich veins that reach up to >20m wide. These phosphorous and rare earth rich rocks are present to significant depths with intersections drilled 600m below surface. The pyroxenites, carbonatites and alteration zones contain consistent disseminated to massive apatite and variable rare earths. Sitting on top of the larger dyke (Rare Dyke) is a well-developed weathering profile hosting high grade rare earths, phosphate, scandium, and niobium mineralisation. The weathering profile can extend to greater than 100m depth. A combination of residual, or eluvial, chemical weathering and primary mineralisation has contributed to the strong enrichment of rare earths and phosphate. A majority of the rare earths mineralisation in the regolith is contained in monazite with the remainder contained in bastnaesite and crandallite. Weathering processes have created an increase of monazite and apatite concentrations with portions of the regolith phosphate having potential for direct shipping ore (DSO).Large volumes of apatite rich phoscorite surround the Phos Dyke with consistent low grade rare earths in the form of monazite. Many of the drill holes bottomed in phoscorite and the extent of this rock type is open to the north, east and south.The geological model was simplified to three geological units: 1. Regolith – combination of all the domains in the regolith profile with the base of the weakly weathered oxidation boundary marking the lower boundary. 2. Ultramafic/pyroxenite – undifferentiated ultramafics, including altered ultramafics and phoscorite. 3. Carbonatite – dolomitic and calcic carbonatite.The Cummins Range REO deposit occurs within the Cummins Range carbonatite complex which is a 2.0 km diameter near-vertical diatreme pipe that has been deeply weathered but essentially outcropping with only thin aeolian sand cover in places. The diatreme pipe consists of various mafic to ultramafic rocks with later carbonatite intrusions. The primary ultramafic and carbonatite rocks host low to high-grade rare-earth elements with background levels of 1000-2000 ppm TREO and high-grade zones up to 20% TREO. Disseminated apatite is through all rock types and is also contained in phoscorite. Above the carbonatite dykes is a well-developed regolith profile that extends to 100 m below the surface where a combination of residual, or eluvial and chemical weathering have redistributed and upgraded rare earths and phosphate.QEMSCAN and MicroXRF results have showed that all the phosphate is contained in Apatite and Monazite. The Apatite contains low UTh, no cadmium and chlorine, and elevated levels of Fl that are well below acceptable limits.QEMSCAN and MicoXRF have showed the REO in the Regolith are deporting mostly to monazite, with lesser amounts deporting to bastnaesite, crandallite, and REE intergrowths.QEMSCAN and MicoXRF indicate the REO in the fresh rock are deporting to monazite, bastnaesite, parisite and REE intergrowths.DimensionsThe Mineral Resource extends along strike (320°) 850 m, across strike 800 m, and extends down dip to a maximum of 500 m below surface.The regolith mineralisation extends along strike 850 m, across strike 1,100 m, and extends down dip to a maximum of 90 m below surface.
