Regional stream sediment geochemical surveying is carried out in the Ardebil area, scale 1:100.000. According to the request of the client, The -80 mesh portion of samples have been analyzed (ICP/MS) to obtain the contents of which of the 22 elements in the sample.
   The preliminary data processing includes Monovariable elements), bivariable (correlation coefficient) and multivariable statistic (factor analysis) have been done. In the next stage the evaluation of values for calculation of background and enrichment index are carried out. For this purpose the populations of samples with single, double, triple& fourth upstream rock type on thyeir route are discriminated. Then the enrichment index is calculated on thye basis of the median values. The purpose of calculations in this stage is to minimize the effect of Clark values in different rock types. The logarithmic data of enrichment indexes are selected for drawing maps. Some 16 single element maps and two factor analysis maps are produced (most of them with explanatory text).
   In the stage of anomaly checking, some 57 heavy mineral alluvial samples and some rock samples were collected and analyzed by XRD, XRF and ICP methods. The obtained results are used to confirm or reject the already obtained anomalies. The results of heavy mineral alluvial surveying are presented on 10 maps with explanations in each case. The conclusion on the heavy mineral alluvial survey and the applied methods for that are explained in details. The studies on modeling and selection of the most probable mineralized zones in the studies area are presented. The best and most likely proposed area are selected and suggested for further investigations.