Gamma-ray spectroscopy offers a rapid and reliable radiometric method of analysis of U and/or Th ores. Methods of ore analysis are described, and experimental results are presented. The U-Th ratios of rocks, which are important in strata recognition and correlation studies, can be determined directly by gamma-ray spectroscopy without the necessity of making individual U or Th assays. Analysis of potash ores is facilitated with a gamma-ray spectrometer. Erratic behavior of gamma-ray well logs can often be resolved by studying the gamma-ray spectra of these logs. Neutron-activation, followed by gamma-ray spectral analysis, of common earth materials offers a method of borehole rock analysis for elements such as Ca, H, Cl, S, and Mg. Data in studies employing radioactive tracers can often be enhanced through use of a gamma-ray spectrometer. Other present and potential applications of the gamma-ray spectrometer in mineral exploration are also discussed.