Optimization of surface mine contours with the Lerchs-Grossmann 2D model, using spreadsheet programmes

This paper discusses the optimization of open pit contours using the Lerchs-Grossmann model in two-dimensional (2D). The optimization of open pit boundaries is a fundamental task in the planning and design of open pits, with the aim of achieving the highest economic value of the deposit while complying with the technological, geotechnical and economic constraints. The paper presents the basic (theoretical) framework of the Lerchs-Grossmann algorithm, as well as a presentation of the possibilities of applying simple 2D optimization using a spreadsheet programme (Microsoft Excel was used in the paper), based on a practical example.