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5 <br />JD -9 Mine Report <br />Geoscience Services <br />PORFLOW is a comprehensive mathematical model used for the simulation of <br />multi -phase fluid flow, heat transfer, and mass transport processes in variably saturated <br />porous and fractured media. The code can simulate transient or steady -state problems in <br />one, two, or three dimensions using either Cartesian or cylindrical geometry. The <br />geologic medium may be anisotropic and heterogeneous and may contain distinct <br />embedded elements such as discrete fractures or boreholes within a porous matrix. In <br />partially saturated zones, liquids and gases are assumed to co- exist. The degree of <br />saturation of each phase is determined at each grid node as part of the solution. The <br />dependent variable, or its change from the current state, approximates the flux terms. <br />Finally, several options are provided for the incorporation of sources or sinks of fluid, <br />heat, or mass. Fluid injection or withdrawal, sources or sinks of heat, or chemical species <br />may occur anywhere in the interior of the domain of interests. For chemical species, the <br />sources can be limited by their inventory, solubility, or both. <br />PORFLOW numerically solves a variable set of equations for general transport, <br />multi -phase pressure, temperature, and one or more chemical species. The method of <br />nodal point integration is used to integrate the governing differential equations by <br />temporal and spatial discretization over each control volume (element) of the physical <br />domain. It leads to solutions that automatically conserve fluid, heat, and mass locally <br />within every grid element, as well as for the entire flow domain. The storage terms are <br />approximated by a modified Newton - Raphson method (ACRi, 2000). <br />The PORFLOW code is particularly well suited for simulating the transport of <br />fluid and constituents of concern through the underlying unsaturated zone, and into the <br />regional aquifer. PORFLOW can be used to simulate the release of constituents of <br />concern from the waste form (waste rock or ore stockpile) and the subsequent transport <br />through the underlying geological media. PORFLOW was designed especially for <br />problems of fluid and mass transport in geologic media. <br />Several features of PORFLOW are especially important regarding the proposed <br />modeling simulations. First, data exist for the waste inventory and solubility of the <br />constituents of concern. These sources terms are automatically input into the underlying <br />