Integrating Spontaneous Potential and Resistivity Methods in the Delineation of Pb–Zn Mineralized Veins in the Albian Shales in Enyigba-Abakaliki, Southern Benue Trough, Nigeria

Publication Date : 24/05/2022


Author(s) :

Obasi, A.I, Offor, C, Igwe, E.O., Akpunonu, E.O..


Volume/Issue :
Volume 58
,
Issue 1
(05 - 2022)



Abstract :

The characters of the lead-Zinc (Pb-Zn) sulphide filled veins in response to the spontaneous potential (SP) and electrical resistivity methods of geophysics were evaluated in eight (8) different locations around some active Pb-Zn mines in Enyigba-Abakaliki area. Results of the survey indicate that the range of the SP values in the locations are (- 67.4 – 10.26; -118 – 30.05; -109.50 – 21.00; -99.50 – 11.81; -78.50 – 14.78; -80.50 – 11.26; 10.77 – 42.01; -64.56 – 4.23) mV, while that of resistivity are (27.34 – 147.41; 22.63 – 160.29; 27.34 – 167.21; 61.92 – 151.81; 27.34 – 176.64; 49. 35 – 148.35; 77.00 – 180.72; 62.23 - 163.44) ? m. The SP values of ≤ -50 mV and resistivity values of < 50 ? m were associated with structural veins hosting Pb-Zn sulphide ores in the area. Lower values suggest higherquality deposits. The SP method displayed higher efficacy in delineating ore veins in this study. Hence, at points where the results of both surveys were not in agreement, the result of the SP survey was preferred.


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