Stockpile reconciliation is disclosed. Overhead imagery of a pile is accessed at a first point in time. At least one dimension of the pile is determined based on the overhead imagery of the pile. An operational characteristic associated with a generation of the pile is accessed. A three-dimensional (3D) model of the pile is generated based on the at least one dimension of the pile and the operational characteristic. A quantity metric of the pile is determined based on the 3D model of the pile.