integrated exploration on bubye coal project in southern ... · coal seams, free of intrusions and...
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Integrated Exploration on Bubye Coal Project in Southern Zimbabwe
Peter Bourhill 23 MARCH 2012Hillary Gumbo
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Introduction
• The project area is on a Special Grant situated in Southern Zimbabwe, east of the town of Beitbridge
• The Special Grant was mapped using aerial photographs and Google imagery.
• An aeromagnetic survey was conducted over an area approximately 95 square km
• Survey lines were flown N_S at 50m intervals
• The Stratagem CSAMT survey was done on 5 selected lines running N to NNE across regional strike
• CSAMT depth of investigation down to 1km
• Old drill hole data shows that the coal seams coincide roughly with low resistivity zones on CSAMT sections
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Location
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Special Grant within the Bubye Coalfield
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Analyses from Historical BH’s
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Total Field Aeromagnetics
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Reduced to Pole Aeromagnetics
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First Vertical Derivative Magnetics
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…….add faults
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….and dykes
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Magnetic Interpretation
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Geology Plan
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CSAMT Resistivity Section with Interpretation (P5)
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CSAMT Profile 2 – Showing a major fault zone
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3D View of Magnetic Interpretation and AMT Sections
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Sedimentary Basin: Voxel Resistivity Analysis 100+ Ohm-m
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Sedimentary Basin: 200+ Ohm-m
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Coal Seam: 75-100 Ohm-m Resistivity
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Coal Seam Plus Resistivity Interpretation
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Drill Plan
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Conclusion• The aeromagnetic data is very useful in mapping out dykes, faults and lithologies
on surface
• The CSAMT maps out low resistivity zones which are directly or indirectly related to coal seams
– maps the depth extension of dykes, faults and thrusts interpreted from the magnetics
– also useful in mapping out sills, non-magnetic dykes and sedimentary basin thickness
• The geophysics assists the geologist to identify better areas to drill for undisturbed coal seams, free of intrusions and faults making real savings.
• Reserves and Resources will be calculated with more assurance, particularly in difficult areas like Bubye.
• There is now confidence that an opencast resource could be delineated with drilling and it would support a small power station and produce a coking coal.
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Not Done Yet and Not DustedThank You