This paper describes a new computer program which can
significantly increase the Net Present Value of either an open cut
or underground mine by optimising the cut-offs used during the
operating life of the mine. It was developed over a period of
about three years by Whittle Programming Pty Ltd of Melbourne,
Australia. Several authors have contributed to the theory behind this
work, but the ideas were further developed, consolidated, and
clearly explained by Lane (1988). It was this book that triggered
the development of the new program. The paper starts with an explanation of the theory behind this
type of optimisation, and then goes on to describe the computer
methods used to optimise the different parts of the problem.