Metallurgical Testwork Delivers Premium 64.1% Iron Product
Perth, Oct 16, 2012 AEST (ABN Newswire) - Equatorial Resources Limited (
ASX:EQX) is pleased to announce excellent metallurgical testing results from work conducted on diamond drill core samples of near surface hematite mineralisation from the Makengui Prospect ("Makengui") at the Mayoko-Moussondji Iron Ore Project ("Mayoko-Moussondji" or the "Project") in the Republic of Congo ("ROC"). The results (summarised in Table 1 and included in detail at Table 2) confirm the potential to produce a premium fines iron product of 64.1% Fe, with high mass recovery, from the near surface mineralisation at Makengui.
View Table 1: Summary of diamond drill core metallurgical test results, at the link below.
http://media.abnnewswire.net/media/en/docs/ASX-EQX-608290.pdf
Equatorial's Managing Director and CEO, Mr John Welborn, said "These results continue the excellent work being completed by Dr John Clout, Equatorial's Chief Metallurgical Consultant, that demonstrate the huge advantages of the mineralisation we are delineating at Mayoko-Moussondji. These results are extremely exciting and very important as the test work results relate to the near surface hematite mineralisation which is the target of our on-going drilling campaign and will be the focus of our initial resource estimate. Our business plan for Mayoko-Moussondji is to use existing transport infrastructure to deliver a high grade premium product to the market."
Mayoko-Moussondji Geological Model
The geological model for Mayoko-Moussondji comprises enriched oxide hematite caps overlaying substantial fresh magnetite banded iron formation ("BIF").
Based on the drilling completed to date the following potential ore types have been identified (Figure 1, refer to link below):
- DSO (Zone 1): Shallow enriched hematite mineralisation which is capable of producing a premium iron product after simple crushing and screening;
- pDSO (Zone 2): Enriched loose and friable hematite mineralisation with a grade of between 40% Fe and 55% Fe that has the potential for simple benefication to a premium iron product after simple crushing, wet screening and gravity separation with recoveries over 50%;
- Colluvial (Zone 3): Erosion of the DSO and pDSO has resulted in the deposition of colluvial iron mineralisation with a grade of between 40% and 60% Fe on the flanks of hillsides and as a valley fill; and
- Magnetite (Zone 4): Transitional and Fresh magnetite BIF with a grade of between 30% Fe and 40% Fe. This material can be wet processed to produce a concentrate product with a high iron grade of 69% Fe and mass recoveries of 50%.
Mayoko-Moussondji Metallurgical Test Program
Equatorial's metallurgical testing program has been designed in distinct work programs based on the Company's geological model for the different mineralisation types found at Mayoko-Moussondji. The aim of the testing program is to demonstrate the potential to produce a range of premium iron ore products. Results from the work prgram to date have been very encouraging. Davis Tube Recovery results for the magnetite BIF (Zone 4) returned concentrates of 68.9% Fe with a mass recovery of 50% (see ASX announcement dated 24 April 2012). Simple wet processing of the colluvial iron mineralization (Zone 3) produced a lump and fines product with a combined product grade of 63.4% Fe, 3.4% silica, 3.0% alumina and 0.052% phosphorus with a mass recovery of 61.0% (see ASX announcement dated 26 April 2012).
DSO and pDSO Iron Mineralisation Metallurgical Test Results
Detailed metallurgical and product quality test work on bulk sample and diamond drill core samples of DSO (Zone 1) and pDSO (Zone 2) mineralisation types has been conducted in Perth by SGS Lakefield Oretest Pty Ltd and by NAGROM Laboratories ("NAGROM") under the supervision of Dr John Clout. The results released today are from twelve intervals of iron mineralisation from six diamond drill holes, each weighing approximately 10 to 55kg, collected from the central area of the Makengui prospect. The intersections included typical examples of Zone 1 and Zone 2 hematite mineralisation as well as two samples of the transition between Zone 2 and Zone 4.
Each sample was crushed into lump and fines, wet screened and the fraction below 1 mm beneficiated by gravity separation using a hydrosizer-Wilfley Table combination where sufficient sample mass allowed, or by heavy liquid separation of the -1.0 + 0.50 mm and -0.050 +0.038 mm fractions using a specific gravity of 3.70 g/cm3. The fraction below 1 mm was upgraded at the NAGROM laboratories in Perth Australia where clays and quartz sand were rejected using two stages of hydrosizer, with the final underflow product upgraded using a Wilfley Table. The less than 1 mm flowsheet was designed to simulate a typical Pilbara desanding plant circuit that uses a simple hydrocyclone-upcurrent classifier-spiral circuit. All fractions above 1mm were not beneficiated and so regarded as a Direct Shipping Ore component and included as -8.0 mm fines in the final product grade calculation. The hydrosizer (HS) -Wilfley Table (WT) or heavy liquid (HLS) sinks products were included as the beneficiated component of the product.
The test results are included below in Table 3 and are highly encouraging as they demonstrate mineralisation Zones 1 and 2 have the potential to produce a premium grade iron product. The weighted mean results show a combined fines product mass recovery of 54.5% and Fe recovery of 72.3% and product grade of 64.1% Fe, 4.6% silica, 1.5% alumina and 0.076% phosphorus, and very low levels of other contaminants. The mean product calcined grade, after allowing for removal of crystal water (LOI), was 65.2% Fe.
These exceptional results for Zones 1 and 2 are consistent with those reported previously for the Zone 3 colluvial mineralisation as reported above. Larger bulk samples are currently being processed and will allow for more extensive upgradability testing, lump conditioning and product sinter and lump quality testing.
Mayoko-Moussondji Drilling Program and Resource Definition Work
The drilling program underway at Mayoko-Moussondji is designed primarily to target near surface hematite mineralisation and oxide iron mineralisation that is easily upgradeable to a premium product. This material is contained within the enriched supergene zone of the substantial BIF mineralisation which makes up the 46km's of prospective iron strike at Mayoko-Moussondji. The diamond drill holes used for the metallurgical test work are located at the Makengui Prospect which is approximately 12kms long and is located 500 metres from the operational railway line that leads directly to the deep water port of Pointe-Noire.
Currently the Company has completed approximately 40,000m of the planned 70,000m drilling program designed to delineate high grade DSO and pDSO hematite. It is expected that the drilling required for the commencement of work on an initial JORC compliant resource estimate will be completed by the end of the current month. The initial resource estimate is expected to include the drilling completed at Makengui. The initial resource estimate will be independently prepared by the United Kingdom office of international resource industry consultants CSA Global Pty Ltd.
View the complete Equatorial Resources announcement including Tables & Figures at the link below:
http://media.abnnewswire.net/media/en/docs/ASX-EQX-608290.pdf
Contact
Equatorial Resources Limited
T: +61-8-9466-5030
E: info@equatorialresources.com.au
WWW: www.equatorialresources.com.au
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