Data on world‐wide geophysical activity in mining exploration programs is collected annually by the SEG Geophysical Activity Committee as part of a continuing service to the industry. The data is obtained by sending out questionnaires to all organizations which are known to be carrying out mining geophysical work; the organizations canvassed include mining companies, contractors, government departments and universities. The questionnaire is divided into three sections, namely ground methods, airborne methods, and research. The data compiled from the questionnaires shows that world‐wide utilization of mining geophysical methods reached a new high in 1967 with total expenditures of U.S. $32,323,240. This was divided as follows: ground methods—$18,106,785; airborne methods—$10,123,405; and research $4,093,050. For the ground methods, most money was spent on the induced‐polarization technique ($5,681,780); electromagnetic methods were second in reported expenditure ($2,010,900). Total reported geophysical line‐mileage flown was 1,275,072 line‐miles, with aeromagnetic surveying being the most popular airborne method. Total amount spent on aeromagnetic surveys was $5,832,564 for 895,420 line‐miles. This gives an average cost for aeromagnetic surveys of $6.50 per line‐mile.
Characterization of the Iron Ore Deposit Using 2D Resistivity Imaging and Induced Polarization Technique at Diddaye-Potiskum Area, Northeastern Nigeria