Determining the optimal orientation of ultimate pits for mines using fully mobile in-pit crushing and conveying systems

E. Hay, M. Nehring, P. Knights, M.S. Kizil
2019 Journal of the Southern African Institute of Mining and Metallurgy  
Synopsis Ultimate pit limit determination provides the outline of the optimal pit for use in the mine design process. Ultimate pit limit determination for truck and shovel haulage systems can be completed with proven mathematical optimality. For fully mobile in-pit crushing and conveying systems, a new ultimate pit limit determination method must be developed that includes the additional constraints of a straight wall for the pit exit conveyor and regularly flat pit floors. One of the major
more » ... ne of the major steps in the new method is determining the orientation of the straight wall. A proposed method of achieving this using the mathematical concepts of convex hulls and bounding boxes is presented, with an explanation as to how it could be implemented in an ultimate pit limit determination algorithm. This method allows the determination of ultimate pit limits for fully mobile in-pit crushing and conveying with a straight wall oriented to provide the most value to the project. Keywords mine planning, in-pit crushing and conveying, IPCC, truck and shovel, ultimate pit limit, UPL. Ultimate pit limits The problem As UPL determination occurs at the prefeasibility and feasibility levels of study, there is a large range of factors to include that are not fixed, such as which mining method is to be used (a TS method is usually assumed), various economic parameters such as commodity prices (use the current price or a forecast?), Affiliation:
doi:10.17159/2411-9717/104-252-1/2019 fatcat:fjpsoskgh5gztfa5qkjlwr645i