If cost accounting is performed only at the mine level and the workshop level, it would be not easy to know the consumption of bulk raw materials and consumables in a mechanized open pit mine. In Xiaoyi Bauxite Mine, three level cost accounting is performed, that is, in addition to the mine level and workshop level accounting, cost accounting is also performed on a shift/unit machine basis. Therefore, monitoring and control is enforced for the consumption for consumables and raw materials, leading to remarkable results.