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Following the announcement of its maiden JORC inferred resource on 20 June 2011, Legacy Iron
Ore Limited (Legacy) is pleased to announce that Davis Tube Recovery (DTR) metallurgical
tests confirm the high grade magnetite mineralisation at Mount Bevan (Mt Bevan).
The results from this comprehensive DTR test work are excellent and continue to demonstrate that
the Mt Bevan resource will produce a consistent, high quality concentrate product with low
impurities.
Mt Bevan is a joint venture between Legacy and Hawthorn Resources Limited (Hawthorn)
whereby Legacy will earn a 60% interest in the project by expending a minimum of $3.5 million to
develop the project to a pre-feasibility status.
A maiden JORC compliant Inferred Resource of 617 Mt at 32.1% Fe for the first phase RC drilling
program was announced on 20 July 2011. This first phase drilling program was conducted over
some 40% of the strike length of the Western BIF unit the first of several iron ore prospects to be
drill tested within the project area.
A total of 206, 6m composite samples were taken from the central thick magnetite bearing BIF
drilled during this first RC drilling program and tested by ALS Perth for magnetite recovery using
the Davis Tube Recovery (DTR) technique. This technique includes the recovery onto magnets
of magnetite from a sample ground to a specific grind size as determined by grind curve testing
and analysis. The DTR method provides a laboratory approximation for commercial extraction of
magnetite by magnetic separators.
The DTR program was conducted by ALS, Perth with supervision by Calibre Global a major
Australian based international provider of project management, engineering and consultancy
services to the resources and infrastructure industries. Preliminary metallurgical testwork by
Ammtec including grind curve optimisation indicated the use of a 75 micron screen in the DTR
procedure (yielding an approximate P80 of 45 - 50 micron). This is a relatively coarse screen size
for WA magnetite mineralisation.
The results from this comprehensive DTR test work are excellent, with an average weight recovery
of 44.63%, and an average concentrate grade of 69.8% Fe, Silica contents average a very low
3.28%, with very low sulphur and phosphorus. Of note, within the thick magnetite BIF, there
appears to be higher Fe, lower silica in the upper (hangingwall) zone, offering potential during
mining to produce differing mill feeds.
These results place the Mt Bevan magnetite resource at the highest quality level of West
Australian magnetite projects, particularly in the low silica component of the concentrate. Most
peer projects show DTR concentrate silica in the 4.5 to 6% range.
Attachment 1 provides all head assay and DTR results for the phase 1 RC drilling program.
The DTR results indicate that a high purity magnetite concentrate can be produced. This gives the
project potentially the flexibility to produce either normal BF (Blast furnace) grade pellets
(silica < 5.5%) which may be produced at a coarser grind size, or premium DR (Direct reduction)
grade pellets (silica < 3%) at a finer grind size