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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.
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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.
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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/.
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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/.
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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/
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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.
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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.
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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.
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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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