a ResumoApós períodos turbulentos nos últimos anos, os setores de mineração e construção civil apresentaram considerável recuperação em 2017. Consequentemente, a comercialização de agregados para construção reaquece, principalmente em cidades com alta taxa de crescimento, destacando-se a cidade de Catalão no interior do estado de Goiás. O município apresenta-se entre os maiores PIBs do estado. Diante desta situação, este estudo tem como objetivo realizar a simulação de uma análise de investimento para instalação de uma pedreira na região de Catalão/GO. O primeiro passo consistiu na determinação da produção necessária, obtida em função do consumo de agregado (brita) na região. Na sequência, foi definido e dimensionado os equipamentos necessários a lavra do material, elaborado o fluxograma do beneficiamento do material e estabelecido do balanço de massas em função da produção horária necessária, permitindo a seleção e dimensionamento dos equipamentos de usina. Uma cotação dos custos para aquisição dos equipamentos foi realizada junto aos fabricantes. O passo seguinte consistiu em definir custos com insumos, mão de obra, obras de alvenaria e infraestrutura necessárias. Os dados permitiram a elaboração de gráficos com cenários diferentes de retorno do investimento inicial. Os resultados apresentados pelos cenários 2 e 6 foram melhores que os demais. Entretanto, cada um possui características particulares que devem ser levadas em consideração, as quais dependem do perfil de investimento almejado. Palavras-chave: Simulação; Avaliação econômica; Pedreira. AbstractAfter turbulent periods in recent years, the mining and construction sectors showed a considerable recovery in 2017. As a result, the commercialization of construction aggregates reheats, especially in cities with high growth rates, especially in the city of Catalão in the interior of the state of Goiás. The municipality is among the largest PIBs in the state. Given this situation, this study aims to simulate an investment analysis for the installation of a quarry in the region of Catalão/GO. The first step was to determine the production required, as a function of aggregate consumption (gravel) in the region. After that, the equipment needed to surface mining was defined and dimensioned, the flow chart for the material processing was established and the mass balance was established as a function of the hourly production required, allowing the selection and sizing of the plant equipment. A quotation of the costs for equipment acquisition was made with the manufacturers. The next step was to define costs with inputs, labor, masonry and infrastructure needed. The data allowed the elaboration of graphs with different scenarios of return of the initial investment. The results presented by scenarios 2 and 6 were better than the others. However, each one has particular characteristics that must be taken into account, which depend on the desired investment profile.
The search of ornamental rocks cutting technology to meet the market and efficiently together economic, environmental and safety parameters is increasingly requested in the mineral sector. This study tried to compare two cutting technologies with respect to their technical-operational aspects: diamond wire and water jet. The methodology used consists of a bibliographical research raising data of both technologies and organizing them in graphs and tables for the best comparison. The diamond wire offers significant economic advantages over water jet, which limits the use thereof. Regarding the environmental aspects, the two techniques proved to be equivalent, with optimum performance in this parameter. The water jet has advantage in safety factor in relation to the diamond wire, due to its ability to cut by computerized system.
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