Recently at Meteorological Service of Canada (MSC), we have developed a high resolution Global/Regional Atmospheric Heavy Metals Model (GRAHM). GRAHM is an Eulerian Multiscale model and at present it is being used to investigate atmospheric mercury at global scale. The model solves dynamic equations for all meteorological processes and physio-chemical processes for mercury species. The model has variable resolution in vertical and horizontal. By making use of the variable resolution grid in horizontal, the model could be used for simulations on scales from global to urban by placing a high resolution window on a desired region. Gas and aqueous-phase chemistry, multiple-resistance based dry deposition, vertical planetary boundary layer diffusion, cloud-chemical interactions using detailed cloud schemes and wet deposition form the set of mercury processes included in the model. Global anthropogenic emissions of mercury for 1990 available from Global Emission Inventory Activity(GEIA) have been introduced in the model. The model was integrated for multi years to answer some of the questions related to mercury cycling in the atmosphere. Model description and results from the multi-year run will be presented at the conference.