Since many years, measuring magnetic susceptibility has been used as a quick and extensive method for mapping heavy metal burdens of soils. The depth distribution of magnetic susceptibility enables a differentiation between geogenic and anthropogenic loaded soil. The aim of this work was the evaluation of possible loaded soils in Knappenberg, an area characterized by an iron mining tradition of more than two thousand years. It was not only about the distribution of anthropogenic particles through wind from the smelting sites, but also about the possible identification of Roman and medieval slag heaps or in-situ ore (iron hat). During fieldwork a measuring field of 4km x 4km was examinded in a grid of 250m x 250m. The spatial variation of magnetic susceptibility values and frequency-dependence gave evidence for three major anomalies in the regions of Heft, Hüttenberg and at the intersection Görtschitztal - Löllinggraben, which can partly be traced back to human activities, as well as four minor isolated anomalies in Lölling, Untersemlach, Knappenberg and Großkoll. Along a profile across the entire working area, 17 soil cores of 30cm length were extracted in order to measure the depth distribution of the susceptibility and to identify magnetic phases by means of mineral magnetic examinations, microscope and Raman spectroscopy, chemical analyses (RFA) and X-ray diffractrometry. The magnetic anomalies in the southern part of the study area can be related with the lithology (Plankogel mineralisation, Mn-rich ores, serpentinite). An indication for an ancient processing plant was found in the area Grosskoll.