Application of Areal Transient Electromagnetic Method Measurements Directed on Polymetal Prospecting

The results of transient electromagnetic method soundings areal measurements directed on polymetal prospecting are presented in this paper. Measurements are carried out by transient electromagnetic method (TEM)soundings within Ergozhu ore field in the Irkutsk region, Russia. The way of excitement of electromagnetic field in a large size generating contour was chosen and measurements were executed by small receiver loops which were moved along on system of profiles with a detailed step. As a result of processing of TEM field data geoelectric parameters of rocks and ore objects which are allocated with abnormal values of the specific electric resistance are determined. Areal and spatial distribution of geoelectric characteristics of an ore field is received. Geoelectric sections and maps of the main structural horizons with allocation of ore objects are constructed. Areal survey and chosen sizes of loops provides necessary resolution of the TEM in the conditions of considerable lateral and vertical inhomogeneity of rocks. Thus, the purpose of work consists in identification of spatial placement of perspective ore zones according to the TEM on the basis of three-dimensional visualization of results of observation.