Iron Road Limited (ASX:IRD) Positive Metallurgical Test Work Results Continue At Central Eyre Iron Project
Perth, Aug 9, 2010 AEST (ABN Newswire) - Iron Road Limited (
ASX:IRD) is pleased to announce that initial results from its extensive PFS metallurgical test work program at the Central Eyre Iron Project (CEIP) indicate viability of the hematite (oxide) component of the orebody. Oxidised iron samples are upgradable by both gravity and magnetic separation methods, with average concentrate grade of 60% iron.
The testing is part of the Company's pre-feasibility study for CEIP, which is scheduled to be completed in early 2011.
Highlights
- Wet High Intensity Magnetic Separation (WHIMS) test work and Wilfrey table test work on RC chip samples indicates that hematite (oxide) ore from the Boo-Loo - Dolphin prospect is amenable to upgrading.
- WHIMS at a magnetic strength of 10,000 Gauss and -212micrometre grind produced a concentrate containing ~60% iron with ~5% SiO2. Iron recovery was approximately 60% with a mass recovery of 30%.
- Wilfrey tabling generated >60% iron with best grade and recovery performance at 500micrometre.
- The coupling of both gravity and magnetic separation during beneficiation may reduce overall capital costs.
- Central Eyre Iron Project remains one of Australia's most significant emerging magnetite projects.
Iron Road engaged Mineral Engineering Technical Services (METS) to comprehensively investigate the metallurgical characteristics of the Warramboo mineralisation as a major component of the pre-feasibility study (PFS) at the Central Eyre Iron Project in South Australia.
These studies include an oxide test work programme that to date has examined oxide ore from RC chips. The test work will be repeated using diamond drill core and include variability test work and QEMSCAN analysis.
Commenting on the results, Iron Road Managing Director, Andrew Stocks, said that the recovery of iron from the oxide portion of the mineralisation was a pleasing development.
"The hematite component is approximately ten per cent of the current Mineral Resource and these results reveal the robust nature of the Central Eyre Iron Project. Demonstrating the oxide recovery, along with our belief that the Central Eyre hosts a very large and very coarse magnetite iron ore deposit will only strengthen the pre-feasibility study, still scheduled for completion in Q1 next year," he said.
The Wet High Intensity Magnetic Separation (WHIMS) test work programme was conducted at four grind sizes of -500, -212, -106 and -75micrometre. For each of the grind sizes, the magnetic separation was undertaken at four levels of magnetic force, including 2,000, 3,000, 6,000 and 12,000 Gauss. This aimed to determine the optimum magnetic force required to permit effective upgrading of the oxidised sample.
Except for the -500 micron samples, all samples were amenable to upgrading by magnetic separation, producing concentrates that meet the specification of a saleable hematite concentrate i.e. iron grade ~60% and SiO2 <5%. Increasing the magnetic strength improved the mass and iron recoveries. However, the quality of the magnetic concentrate decreased accordingly.
Balancing between the quality of the magnetic concentrate and the recoveries data, the best performance was achieved at magnetic strength of ~8000-10000 Gauss. At a magnetic strength of 10000 Gauss, the optimum performance was achieved at -212 micrometre, where a concentrate containing ~60% Fe and ~5% SiO2 was generated. About 60% of the iron was being recovered in 30% of the mass.
The Wilfley table test work programme was conducted at four different grind sizes of -500, -212, -106 and -75 micrometre. For all the grind size investigated, the ore was amenable to upgrading by Wilfley table. At -500micrometre, the iron grade was upgraded from 31% to 61.7% Fe, with 19.9% of the iron being recovered in 10% of the feed mass.
Contact
Andrew Stocks
Managing Director
Iron Road Limited
Tel: +61-8-9200-6020
Mob: +61-403-226-748
Email: astocks@ironroadlimited.com.au
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