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May 11, 2004Keywords:
Fault-fractures Vein-lodes Dip Contours Resistivity Geo-Electric Section Anomaly and Mineralization Potential
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SP AND VES RESPONSES OVER PB-ZN AND ASSOCIATED SULPHIDES MINERALIZED ZONE OF IZZI AREA, NIGERIA
Abstract
Lead-Zinc mineralization in some parts of Izzi area has attracted a number of private miners into the area. The miners can not be said to have been very successful. This is due to the nature of mineralization which occur in isolated vein-lodes that are fracture controlled. Their information on the mineralization or prospecting has been based on reports of Villagers, Shallow hand-dug pits and of douncing rod exercise.
Results of 30 electric Self Potential (SP) measurements at two prospective zones of the locality has positive responses for Sulphide mineralization indicated by high negative SP anomaly along two separate bands. The trend of anomaly shows prospective zones of mineralization in the North-South axis across the area, with dip direction towards the North, following the trend of the shale host rock and along the two prospective bands.
Result of seven Vertical Electric Soundings (VES) show that the overburden material to the shale host rock consisting of Sandy-Siltstone and Shaly-Mudstone has average depth between 25-39m, given thickness of 11-19m across the area.
The Shale host rock is classified into three layer-zones based on resistivity value. A non mineralized zone, with resistivity value less than 3000 (ohm-m). A mineralized zone with resistivity value between 3000 to 5000 (ohm-m) where sphelarite (Zinc ore) is predominant and a highly mineralized zone with resistivity value between 6000 to 8000 (ohm-m) where Galena (lead ore) is dominant. The two bands are due to faulting . Band A at the down throw portion of the fault corresponds to the topographically low area and Band B at the upthrown, corresponds to high topography zone of the study area.
KEY WORDS:Fault-fractures, Vein-lodes, Dip, Contours, Resistivity, Geo-Electric Section, Anomaly and Mineralization Potential.
Global Jnl Geological Sciences. Vol.2(1) 2004: 61-66
Results of 30 electric Self Potential (SP) measurements at two prospective zones of the locality has positive responses for Sulphide mineralization indicated by high negative SP anomaly along two separate bands. The trend of anomaly shows prospective zones of mineralization in the North-South axis across the area, with dip direction towards the North, following the trend of the shale host rock and along the two prospective bands.
Result of seven Vertical Electric Soundings (VES) show that the overburden material to the shale host rock consisting of Sandy-Siltstone and Shaly-Mudstone has average depth between 25-39m, given thickness of 11-19m across the area.
The Shale host rock is classified into three layer-zones based on resistivity value. A non mineralized zone, with resistivity value less than 3000 (ohm-m). A mineralized zone with resistivity value between 3000 to 5000 (ohm-m) where sphelarite (Zinc ore) is predominant and a highly mineralized zone with resistivity value between 6000 to 8000 (ohm-m) where Galena (lead ore) is dominant. The two bands are due to faulting . Band A at the down throw portion of the fault corresponds to the topographically low area and Band B at the upthrown, corresponds to high topography zone of the study area.
KEY WORDS:Fault-fractures, Vein-lodes, Dip, Contours, Resistivity, Geo-Electric Section, Anomaly and Mineralization Potential.
Global Jnl Geological Sciences. Vol.2(1) 2004: 61-66
