Crown Polymetallic Resource.
As well as Rare Earths, the Mt Weld carbonatite is host to potentially economic deposits of niobium, tantalum, zirconium, and titanium, collectively termed polymetallic by Lynas.
A number of drilling programs have been conducted aimed specifically at the Crown Polymetallic deposit and its niobium and tantalum resource definition. A scoping study has identified an open pit mine followed by a conceptual process route, based on existing technology, located in China to produce the Polymetallic product suite.
Dr Phillip Hellman of Hellman & Schofield Pty Ltd, Sydney, completed the multi-metal geostatistical resource estimation study.
The Indicated and Inferred Resources estimated for the Polymetallic Crown deposit total 37.7 million tonnes with an average ore composition as presented in the table below. The majority of the ore lies between 30m and 60m in depth, suitable for open pit mining.
A large proportion of the value in the resource is in the niobium which has an average grade 1.07% Nb2O5 (niobium oxide). Taking into account the credits for the other Rare Metals and by-products the equivalent niobium oxide mine grade is 2.1%.
Polymetallic mineral Resources for Coors and Crown Sectors, Mt Weld
Mt = million tonnes, other figures are percentages. Ta2O5 tantalum oxide, Nb2O5 niobium oxide, TLnO rare earth oxide, ZrO2 zirconia, Fe2O3 iron oxide, P2O5 phosphate, Y2O3 yttria, Al2O3 alumina, TiO2 titanium oxide
The Mt Weld Resource is potentially the world’s second largest Nb2O5 resource (ranked by contained niobium metal) compared to the resources of existing commercial operations which include:
CBMM’s Araxa deposit in Brazil, with 460 million tonnes grading 2.5% Nb2O5 supplies over 80% of the world niobium market,
Mineracao Catalao de Goias Ltd’s (Anglo American plc) deposit in Brazil totalling approximately 18 million tonnes at an average of 1.34% Nb2O5, and
Niobec Inc’s Canadian underground deposit of 24 million tonnes at 0.65% Nb2O5
Given the size of the resource and the economic and technical strength of the scoping study, the next step for the Polymetallic Crown deposit is commencement of a feasibility study. This will be deferred until after the development of the Rare Earths project.
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