Abstarct: The exploration and extraction of mextal resources is of special importance from the past to the present, and now the exploration of mineral resources has been accompanied by changes compared to the past. In other words, modeling deposits and checking the amount of available reserves has become one of the main elements of exploration. 3D modeling allows geometrical, structural, geological and geochemical characteristics to be observed simultaneously. In fact, 3D modeling is done using geochemical, geological, topographical data and information of excavations and trenches at the same time. Exploratory geochemistry is of great importance in the diagnosis of deposit geometry. This method accelerates extraction performance and reduces costs. Gandi and Abolhasani deposits are the most important mextallogenic polymextallic deposits of Troud-Cah-Shirin belt, which are known for their lead, zinc and gold resources. Modeling of a mineral system to evaluate the probability of occurrence of a type of mineral deposits is valuable and efficient if it is presented using two important indicators. One is modeling on a spatial scale (two-dimensional and three-dimensional) and the other is geochemical modeling of mineral matter (quantitative and geometric evaluation of the deposit). As a mathematical model, the GIS environment has the ability to dynamically update modelings or its reliability for reconstructing geological anomalies related to the collection of surface and depth data, and from this point of view, for the integration of multiple spatial data (land science, geochemistry and geophysics) is used. In addition, this mathematical model emphasizes geological conceptual models. The purpose of this investigation in Gandi polymextal mine was to use the available data at the same time in this mine, which led to the discovery of a high-grade vein of mineral material, unlike the geometry of other veins, which is due to The complex geological and tectonic structures of this region is considered a difficult task. Using the geochemical zoning method reduces our need for exploratory drilling and eliminates the need for drilling operations in areas that require pipe laying. By using the geochemical zoning method and examining the past drilling wells and simultaneous extraction, the vein at a depth of 50 meters was investigated and it was found that the exploration of mextal veins by drilling is not a suitable method and useful information about the geological complexity of the region We do not give. In fact, by using trenches and matching data in this mine, a model was created at a depth of 50 meters and then developed to greater depths. Finally, the output of the data is a vein with a slope of 45 degrees and an east-west extension, which is currently being mined, which is 400 meters long and reaches a depth of 300 meters from the lake pit to pit number 95 of the Gendi mine. The depths of the earth continue. Keywords: mextal exploration, mining geochemistry, modeling, geochemical zoning method, Gandi, mineralization.