Аннотация:In 1977, on the western coast of Lake Baikal, near the village of Shara-Togot, Olkhon region, a monument to the ancient metallurgy of iron Barun-Khal II was unveiled. According to the radiocarbon method, the age of the monument is 2180-1750 years. The area, promising for the detection of objects related to ancient metallurgical centers, is quite large, several tens of kilometers in length and several kilometers in width. In this regard, the search for new archaeological sites by traditional methods is difficult. A possible way to optimize searches, as well as study archaeological sites without excavating them, are geophysical methods - magnetic prospecting and electrical prospecting. In this case, surveys were carried out on the reference object by methods of ground and UAV magnetic prospecting and electrical prospecting. Also, modern 3D-inversion of magnetic and electromagnetic imaging was performed. This made it possible to evaluate the effectiveness of each of the methods, to compare the reliability and information content of the observed data and the resulting 3D models of the hidden object. In this work, on the example of one of the objects of the Barun-Khal II monument, the results of a complex of geophysical research are analyzed, including ground and UAV-magnetic surveys, electrotomography (Skala-64 equipment).