In Idrija, Slovenia, where the world’s second largest mercury (Hg) mine operated has a significant amount of Hg emissions into the atmosphere by a surface process of adsorption of Hg from and to soil particles surfaces, which results in a diffusion of Hg through the pores of soil.  To calculate the emission flux for Hg, a Hg emission model was developed:
=E/(R*T )+n*ln[Hg]+m+0.003*R	    Equation 1</div>
in which the F is the flux of Hg emission, E is the activation energy, R is the gas constant, T is the soil temperature, n and m are constants, [Hg] is the Hg concentration, and 0.003* R accounts for the solar radiation since the solar radiation has the effect on the temperature, hence the solar radiation has the effect on the emission flux of Hg.
Once the Hg concentration data was gathered, a schematic model has been prepared for GIS input, which consisted of a digital elevation model (DEM), a satellite land use map, and EARS data.  Using the inverse distance weighted (IDW) method from geostatistical tools in ArcGIS 9.3, a raster model of the Hg concentration has been produced for the Idrija area.