Provus is the realization of a dream harbored for 20 years; to be able to easily simulate the EM response of mineral deposits using models that can have complex shapes better approximating deposit geometry. Provus uses Structured Deformable Sheets as the basis for computing the eddy currents induced on the conductor surface without the need to compute a regular triangulated mesh. Control points can be freely manipulated by the user allowing both the shape and the underlying mapping used by the EM calculation to change in “real time”. Compare simulated responses to field data with sophisticated plotting tools. Set up the optimizer to automate the iteration of the locations of selected control points against the misfit between observations and computed responses. Understanding of the simulated fields is aided by visualization of the induced eddy currents on the conductors themselves and as vector panels displaying their primary, secondary or total magnetic fields. Any number of complex conductors can be modelled, allowing for the physical mutual interactions between them.