Austin C. Okonkwo and Chukwudi C. Ezeh
An integrated ground geophysical exploration for sulphide ore deposits has been undertaken at the EPL A40 mine field, Lower Benue Trough, Nigeria. The mine field is about 5sqkm, underlain by two main geologic units. The Abakaliki Shale and the Ezeaku Formation. Self Potential, Resistivity and Electromagnetic methods were utilized. Data was interpreted using surfer 8 computer software and Ms Excel tool Kits. Iso-contour maps of Self Potential, Resistivity and Electromagnetic (EM-VLF) values and profile plots for anomaly variations were constructed. Results show good anomaly match across Self Potential and Electromagnetic data sets with a corresponding high apparent resistivity values which is indicative of sulphide ore deposits. Trend orientations of anomaly peaks occur roughly NW – SE and NE – SW in a cross – cutting stress pattern.
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