Efficient methods to model and optimise the design of open cut mines have been known for many years. The design of the infrastructure of underground mines has a similar potential for optimisation and strategic planning.
Our group has developed two pieces of software to tackle this problem–UNO (underground network optimiser) and DOT (decline optimisation tool) over the last 5 years. The idea is to connect up a system of declines, ramps, drives and possibly shafts, to minimize capital development and haulage costs over the lifetime of a mine. Constraints which can be handled by the software include: gradient bounds (typically \( 1:7 \)), turning circle restrictions for navigability, and obstacle avoidance. The latter constraint keeps development at stand off distances from ore bodies and ensures that it avoids regions which involve high cost, such as faults, voids and other geological features.
The software is not limited to only interconnecting fixed points. It has the useful feature that a group of points can be specified such that the development is required to connect to one member of the group. So for example, if an existing ventilation rise must be accessed at some level, then a group of points along the rise can be selected. Similarly this gives the opportunity to use variable length crosscuts from a decline to an ore body. The latter gives important flexibility and can significantly reduce the development and haulage cost of a design.
Finally the goals for the next phase of development of this project will be discussed, including speeding up the algorithms and allowing for heterogeneous materials, such as aquifers and faults, as additional costs rather than obstacles.
