Worldwide utilization of mining geophysical methods reached a new high in 1968 with total expenditures of 41,367,011 dollars. This was divided as follows: ground methods -- 20,398,288 dollars; airborne methods -- 14,937,733 dollars; and research -- 6,039,990 dollars. For ground methods, most money was spent on IP techniques, geochemical methods being second. Expenditures on mining research were up 48 percent from 1967, the U.S. increase being 54 percent. The leading research activity was the magnetic method, with electromagnetic research second. Airborne radiometric line-mileage showed a nine-fold increase from 1967 to 1968.

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