Abstract: Though the layouts of exploration engineering are variable, there must be a site where an orebody vanishes between the exploration engineering that finds the ore and that which finds no ore. The algorithms of average pinchout angle, finite distance extrapolation and infinite distance are studied and used in constructing orebody pinchout lines. The orebody pinchout auto creation system is realized by using NET language and Object ARX 2007. The system runs stably and is easy to operate. It can produce reasonable and visualized pinchout lines, facilitating the formation of solid model.

Key words: Pinchout line constructing system, Finite distance extrapolation, Infinite distance extrapolation, Average pinchout angle