This communication outlines the field procedures used successfully in locating and delimiting disseminated copper mineralization in the Mountain Province, Luzon Island, Philippines. It is intended to be a guide to geochemical prospecting for similar deposits in similar environments. Although the methods described here may not be suitable for all copper occurrents, it is considered that the rapidity and simplicity of the technique, and the low cost factor make it an attractive aid to exploration. A more detailed discussion of the theory and practice of geochemical prospecting is given in "Summary Report on Exploration for Stockwork Copper Deposits, Sto. Nino Area, Mountain Province, Philippines" which is being prepared for distribution by the Bureau of Mines.