Bulldozer is a kind of earthmoving machinery which can excavate, transport and dump rock and soil. It has wide use in open-pit mines. For example, it is used for building dump, leveling automobile dump, stacking scattered rock, leveling working flat and building site. It can be used not only for auxiliary work but also for main mining. For example, the peeling and mining of the sand bed, the traction and boosting of the scrapers and the ploughers, and the reduction of the height of the steps in conjunction with other earthwork machinery in the absence of transportation.