The first part of the book is devoted to the presentation of the procedure for slip searches. It touches upon the formation of scattering halos, the procedure for slip testing during various types of prospecting, the technique for washing slurry samples and their documentation. The second part discusses the methodology of laboratory mineralogical analysis of thin sections, details the methods of separating thin sections into fractions and mineralogical analysis of fractions using physical, optical, microchemical and luminescent research methods. This part contains definitive tables of minerals and a description of the most important schich minerals. The third part summarizes the procedure for processing the results of thin section searches and drawing up thin section maps of various types. The manual is designed for students of secondary geological exploration educational institutions and can be used in practical and laboratory classes.