  Modelling stockpile is a key factor of a project economic and operation in
mining, because not all the mined ores are not able to mill for many reasons.
Further, the financial value of the ore in the stockpile needs to be reflected
on the balance sheet. Therefore, automatically tracking the frontiers of the
stockpile facilitates the mine scheduling engineers to calculate the tonnage of
the ore remaining in the stockpile. This paper suggests how the dynamic of
stockpile shape changes caused by dumping and reclaiming operations can be
inferred using polygon models. The presented work also demonstrates how the
geometry of stockpiles can be inferred in the absence of reclaimed bucket
information, in which case the reclaim polygons are established using the
diggers GPS positional data at the time of truck loading. This work further
compares two polygon models for creating 2D shapes.
