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The vast quantity of geological and geophysical log data available from boreholes in current prospect development operations requires a computer based storage, retrieval, reproduction and interpretation facility. Interactive computing techniques maximise the ability of a geologist or geophysicist to locate essential features and to produce an interpreted log emphasising features of geotechnical or economic importance, which may then be input to a data bank for mine planning studies. Examples from coal and manganese prospects show how correlation techniques implemented on the computer facilitate estimation of litho-logical and geotechnical parameters from geophysical logs, complementing rather than overriding the interpreter’s judgement.