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The magnetic method is one of the ffrst geophysical techniques to be applied to mineral exploration. It was used in the location of iron ore bodies as early as 1640. Today, the magnetic method accounts for a major portion of the mining geophysical effort

This chapter covers two major aspects of the method. The first concerns the characteristics of the earth’s magnetic field and the magnetic properties of the rocks and minerals which reside in that field. The second section deals with methods of treatment and interpretation of data obtained in magnetic surveys.

A number of the papers to follow appear in print for the first time; others have been published elsewhere and, because of their significance, have been selected for republication in this volume. A Selected Bibliography is included as the final contribution to this chapter. The entries have been selected as the most significant contributions in the field of magnetics.

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