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EVALUATION AND RESOURCE ESTIMATION OF RARE EARTH DEPOSITS

Hellman & Schofield Pty Ltd (“H&S”) has had extensive experience in the evaluation of rare earth and rare metal deposits. This includes the evaluation of some of the world’s largest and most significant rare earth deposits.

 

Mt Weld, Western Australia, Australia

This is the richest known rare earth deposit in the world with a published total resource of 12.2 mt at 9.7% REO (2.5% cut-off). The mineralisation is associated with the Mt Weld carbonatite and has originated due to a lengthy duration of supergene processes that have concentrated REE in various minerals such as monazite, apatite, churchite and crandallite. H&S has undertaken the geological modeling and resource estimation of Mt Weld since early 2002. Grade control drilling and mining began in 2006 and 2007 with the result that the resource estimates of H&S proved to be within approximately 1% of actual mined tonnes and grades. Niobium (Nb), tantalum (Ta) and phosphate also occur in various sectors of the deposit.

See http://www.lynascorp.com.

 

 

Nolans Bore, Northern Territory, Australia

H&S has completed resource estimates of the phosphate – rare earth element deposit at Nolans Bore. The deposit has a total published resource of 30 mt at 2.8% REO and 12.9% P2O5 (1.20% REO cut-off). The mineralisation is hosted in fluorapatite, cheralite, monazite, allanite and bastnasite. The mineralised zones are characterised by fluorapatite veins or as stockworks with calc-silicate alteration.

See http://www.arafuraresources.com.au/.

 

 

Cummins Range, Western Australia, Australia

H&S has completed resource estimates of the REO-uranium-phosphate mineralization which is up to 50m in thickness and is mainly developed in a sub-horizontal geometry within deeply weathered regolith developed over carbonatite and pyroxenite rocks. At a 1.0% REO cut-off a total resource of 4.2mt at 1.7% REO has been reported.

See http://www.navigatorresources.com.au/.

 

 

Mountain Pass, California, USA

H&S has completed due diligence resource estimates of the dominantly carbonatite and bastnasite-hosted Mountain Pass deposit. Published resources are approximately 20mt at 7% REO.

See http://geology.csupomona.edu/drjessey/fieldtrips/mtp/mtnpass.htm.

http://www.molycorp.com/

 

 

Heavy Rare Earth Deposit, Kazakhstan

H&S was retained to check the existing resource estimates of rare earth deposit in the north-western part of Kazakhstan produced under the Russian classification system. The mineralisation is heavy rare earth dominated and is hosted by an interesting rare earth phosphate with a potentially low cost recovery process. H&S computerized the existing information and completed the first non-Russian type resource estimate. A detailed assessment and comparison with the Russian estimates was made to help a potential joint-venturer assess the deposit.

 

 

Confidential Alkaline Intrusive Hosted Rare Earth Deposit, Asia

H&S has completed resource estimation and has coordinated mineralogical and metallurgical studies of an alkaline-hosted intrusive rare earth deposit in Mongolia.

 

Kankankunde Rare Earth Deposit, Malawi

H&S completed resource estimates for the Kankankunde carbonatite hosted deposit in Malawi. The mineralisation is dominantly hosted by a heavy mineral that is amenable to low cost gravity processing. Total published resources are 2.5 mt at 4.2% REO (3.5% cut-off).

See http://www.lynascorp.com/content/upload/files/Announcements/Acquisition_of_New_Rare_Earths_Resource_in_Malawi_060907_(2).pdf.

 

 

H&S involvement:

 

Dr Phillip Hellman                      Mt Weld, Mountain Pass, Kankankunde, Kundaybayskoe, Cummins Range, Alkaline Intrusive (Asia).

Mr Arnold van der Heyden           Cummins Range, Alkaline Intrusive (Asia).

Mr Rob Spiers                             Nolans Bore, Kvanefeld

 

 

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Last modified: 19-Nov-2009