You can create a regional model to establish a baseline, then create one or more models with various pit depths to establish the best approach for the mine in question. Mine dewatering models are often used when estimating the required flow capacity for the pumps used in the field. MODFLOW-NWT is great for such situations as it handles dry cells well.
Because mines that need to be dewatered sit below the water table, cells within the simulation will become dry at times due to the removal of the water from the mine. Have you tried dewatering a mine model using MODFLOW-NWT? MODFLOW-NWT is a version of MODFLOW provided by the USGS that uses a method to solve MODFLOW models that are non-linear due to unconfined cells or non-linear boundary conditions, creating an asymmetric results matrix.
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