Methodology to include the comminution specific energy into open-pit strategy mine planning using global optimization
Metodologia para incluir a energia específica de cominuição no planejamento estratégico de mina a céu aberto usando otimização global
Jônatas Franco Campos da Mata, Alizeibek Saleimen Nader, Douglas Batista Mazzinghy
Abstract
Strategic Mine Planning demands an accurate knowledge of the mineral deposit, being very important the use of block models supported by Geometallurgy. Currently, the methodology used considers the mine planning divided into parts (ultimate open pit, pushbacks, scheduling). Global optimization can guarantee the optimal solution once all steps are solved together. In the present study the database Marvin was used and the geometallurgical variable comminution specific energy was included. In the first scenario, called GeoMet1, a ramp-up was included in the first three years. In the GeoMet2, different maximum movement ranges were defined, as well as the implementation of ore stockpiles and their subsequent rehandling. Gains of 9.66% in NPV and 5.18% in ore production were found for GeoMet2. The second scenario presented ore production adhering to the programmed, in addition to greater stability in the stripping ratio. In addition, GeoMet2 was more efficient in controlling the comminution specific energy. Therefore, the implementation of mass movement limitations allied to the use of stockpiles favored the optimization of the mine scheduling results. It was possible to verify the importance of including the variable comminution specific energy in the block model, to provide more realistic and reliable results
Keywords
Resumo
O Planejamento Estratégico de Mina exige um conhecimento apurado do depósito mineral, sendo essencial a utilização de modelos de blocos apoiados pela Geometalurgia. Atualmente, a metodologia utilizada considera o planejamento subdividido em etapas (determinação da cava final, avanços de lavra, sequenciamento de mina). A otimização global pode garantir a solução ideal, uma vez que todas as etapas são resolvidas em conjunto. No presente estudo, utilizou-se o banco de dados Marvin, considerando a inclusão da variável geometalúrgica energia específica de cominuição. No primeiro cenário, denominado GeoMet1, foi incluído um ramp-up nos primeiros três anos. No GeoMet2, foram definidas diferentes faixas de movimentação máxima, bem como a implementação de pilhas de estoque de minério e seu posterior remanuseio. Ganhos de 9,66% no VPL e 5,18% na produção de minério foram encontrados para o GeoMet2. O segundo cenário apresentou produção de minério aderente ao programado, além de maior estabilidade na relação estéril/minério. Além disso, o GeoMet2 foi mais eficiente no controle da variável energia específica de cominuição. Portanto, a implementação de limitações de movimentação de massa aliada ao uso de pilhas de estoque favoreceu a otimização dos resultados de sequenciamento de mina. Foi possível verificar a importância da inclusão da energia específica de cominuição no modelo de blocos, para fornecer resultados mais realistas e confiáveis.
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Referências
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Submetido em:
20/07/2022
Aceito em:
10/11/2022
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