Efficient regional scale 3D potential field geophysical modelling to redefine the geometry of granite bodies beneath prospective, geologically complex, northwest Tasmania

•We compile multidisciplinary geoscientific data to construct a 3D geology model.•Advanced 3D inversion of potential field data can improve geometry of units at depth.•Subregion approach used here can simplify inversion of regional scale complex models.•Refined models improve subsurface geology boundaries directing future investigations.