Sequenciamento direto de blocos com ênfase em custos de transporte

Abstract

Determining mining sequencing is an important mining planning procedure to determine which material will be mined, the quantity and period of the time. Sequencing is dependent on geological, cost and operational models. These variables influence the sequencing of the blocks and consequently can lead an enterprise to success or failure. Mining planning normally defines the production and cost rates in a static manner and based on empirical values, the same values are used throughout the enterprise development. The LerchsGrossmann methodology does not allow the production cost rates to be optimized during the process due to the structure of the method. The need to suppress the inconsistencies of this methodology, this thesis proposes to join Block Sequencing (SB) the methodologies for production rate and mining cost of optimization. The objective of this methodology is to consider the economic factors used in short-term planning in the mining sequencing for the long term. For each year of operation of the enterprise occurs the decrease costs and sale price. In this way can affirm that the mining cost and ideal production rate are changed every year, but the current methodology is not able to consider these changes. If production and production cost optimization is not considered, the enterprise can be sized in a low probability net present value. Because the production scale adopted may be uneconomical, the production rate may not generate the economies of scale expected for mining enterprises. This work does not seek the highest net present value as the only goal, the net present value will be determined with the optimum production rate and optimized mining cost. The result will be a short term mining sequencing capable of considering the optimal production rate for operating costs.