The EL 13512 Gold Property
Regional geological setting belong to that of Precambrian rocks of Nigeria group divided into three principal subdivisions; Migmatite – Gneiss complex, The schist belts and the plutonic series plus affiliated minor rocks which bear imprints of Liberian (~2700Ma), Eburnean (~2000Ma),and Pan African (~650Ma) tectonic events.
The field falls within Ilesha- Egbe gold field belonging to the Schist belts group, one ofthe four major gold fields in Nigeria. Litological units within EL13512 include schistose rocks, Quartzites, Pegmatites, Floating Banded Ironstone and ferruginised laterite.
Greenstone Gold Mineralization
These greenstone facies are widely recognized as the host rocks for primary gold mineralization within the field. However, 80% of artisanal gold production has been from alluvial deposits dived from primary gold mineralization in the greenstone belt.Most primary goldmineralization in the schist belt commonly occur in disseminated form within quartz veins.
Typically,gold bearing quartz veins carry some sulphides,galena and pyrite being the most common.The veins are very often conformable with the general N-StoNNE-SSW structural grainofthebasementandoccurinavarietyofgeologicsettingswhichsuggeststhatthere was more than one period of mineralization.
The eastern half of the area is covered mainly by quartzite mostly trending NNE-SSW. It composed of over 90% quartzite with appreciable amount of feldspar. Mineralized veins of few cm to 1m are observed in some artisanal mining pits. Common minerals observable under hand magnifying glass include gold, tantalite Cassiteriteetc.
Mica-rich Pegmatites are predominant in the western portion of the area, they are low-lying and sometimes they occur as isolated ridges of about 10m higher than the surrounding topography. These pegmatites are mainly Mica (muscovite) rich with over 50% muscovite, 25% Quartz and less than 20% feldspar from field observation.The pegmatites are strongly associated with Base metal Mineralization, such as Tantalite, Cassiterite etc.
Overview of Exploration work on EL 13512
Exploration activities commenced on this field with Geological mapping, followed by Geophysical exploration. The total of 28 (E – W) traverses was established for Geophysical exploration. These traverses completely covered with Electromagnetic (VLF) and Magnetic methods of geophysical survey at 10 meter station spacing along the traverse lines..
Combining the results of the two geophysical methods, several linear structures likely veins which are believed to host ore mineralization were identified. Some are conductive while others are not. Some are conductors within a resistive host while others are within a conductive host. Over 30 of such veins trending mostly N-S were identified in the study area. Their length varies from less than 50m to more than 200m.
Geochemical exploration has been conducted with 48 soil samples and 4 stream sediment samples collected at 200m grid pattern.
These samples have been pulverized in National Geoscience laboratory, Kaduna. Fire Assay and multi element analysis have been concluded in Australian Laboratory Services (ALS), Ghana and Australia. Result interpretation and analysis are ongoing.