Geological situation of the South-Yakutian coal-field is complex due to geocryological factors, e.g. overall development of insular permafrost. Strength and indexes of permafrost rock are increasing for 30% at an average. Natural gamma-intensity Iγ does not undergo practical changes in the process of epigenetic transformation of rock and cryogenic processes. Consequently, gamma-ray logging data (GL) present the opportunity to evaluate argillaceous ness and lithologic composition, which have dominating effect on strength property of rock. The structure and texture characteristic properties of the section are being evaluated by the data of borehole gauging. Data of borehole diameter variation during the drilling process may be regarded integral characteristic of rock strength. Using multimeasuring correlations between geophysic parameters I, δV and strength properties of rock σcm and σcm, σt , are being studied the strength properties of permafrosted coal containing rock by the finding of logging.