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Abstract(s)
RESUMO: O principal objetivo deste trabalho foi a caracterização do maciço calcário explorado na pedreira “EM&R nº 6478”, com base na aplicação do método geofísico de resistividade elétrica, tendo em vista a otimização da operação extrativa de calcário para fins ornamentais. Pretende-se identificar as zonas do maciço com coloração acinzentada, que apresentam menor interesse económico. Verificou-se que os valores de resistividade elétrica sofrem variações significativas nas zonas de contato entre as zonas de coloração bege e as zonas de coloração acinzentada do calcário. Constatou-se que a tonalidade acinzentada se deve à presença de uma fração argilosa na sua composição, que pode explicar os valores mais baixos de resistividade elétrica. A metodologia utilizada revelou-se bastante eficaz no planeamento futuro da exploração, permitindo uma melhor orientação das frentes de desmonte, tornando a exploração ainda mais rentável.
ABSTRACT: The main objective of this work was to characterize the limestone massif exploited in the “EM&R nº 6478” quarry, based on the application of the geophysical method of electrical resistivity, with a view to optimizing the limestone extraction operation for ornamental purposes. The aim is to identify the areas of the massif with a greyish color that are of less economic interest. It was found that the electrical resistivity values vary significantly in the contact zones between the beige and grey areas of the limestone. It was found that the greyish hue is due to the presence of a clay fraction in its composition, which may explain the lower electrical resistivity values. The methodology used proved to be highly effective in the future planning of quarrying, allowing for better orientation of the blasting fronts, making quarrying even more profitable.
ABSTRACT: The main objective of this work was to characterize the limestone massif exploited in the “EM&R nº 6478” quarry, based on the application of the geophysical method of electrical resistivity, with a view to optimizing the limestone extraction operation for ornamental purposes. The aim is to identify the areas of the massif with a greyish color that are of less economic interest. It was found that the electrical resistivity values vary significantly in the contact zones between the beige and grey areas of the limestone. It was found that the greyish hue is due to the presence of a clay fraction in its composition, which may explain the lower electrical resistivity values. The methodology used proved to be highly effective in the future planning of quarrying, allowing for better orientation of the blasting fronts, making quarrying even more profitable.
Description
Keywords
Rocha ornamental Caracterização de calcários Resistividade elétrica Fração argilosa Planeamento da exploração Ornamental rock Limestone characterization Electrical resistivity Clay fraction Exploitation planning
Citation
Gomes, A., Duarte, J. & Ribeiro, J. (2025). Aplicação do método de resistividade elétrica na caracterização do calcário em exploração numa pedreira de rocha ornamental. In: Comunicações Geológicas, 2025, vol. 112, Fascículo Especial I, pp. 365-368. https://doi.org/10.34637/fcdg-n916
Publisher
LNEG - Laboratório Nacional de Energia e Geologia