Abstract
The uranium deposit at Bertholène in SE France has a diffuse mineralization which is divided into fairly distinct ore pockets. Two of these zones have been studied:
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Orebody B which is being mined by cut and fill
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An open pit above the 715 m level.
The recoverable reserves for Orebody B were calculated by applying geometrical constraints due to the mining method to a numerical model of the orebody. This model had been made in a two step procedure of first using indicator functions, then introducing the grades. This makes it possible to reconstitute the overall structure of mineralized veins inside a waste matrix, but the details of the individual veins in the model do not correspond to the reality. The reserves were then compared to the production figures for the whole orebody and level by level.
Inside the open pit, a 3D geostatistical model of the grades was set up directly and was used to reconstitute various sizes of selection blocks. The overall results obtained were compared to those given by the discretized gaussian model. In a more restricted zone, the geostatistical predictions were compared with the production figures.
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© 1987 D. Reidel Publishing Company, Dordrecht, Holland
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de Chambure, L., de Fouquet, C., Fraisse, H. (1987). Calculating Ore Reserves Subject to Mining Constraints, for a Uranium Deposit. In: Matheron, G., Armstrong, M. (eds) Geostatistical Case Studies. Quantitative Geology and Geostatistics, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3383-5_12
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DOI: https://doi.org/10.1007/978-94-009-3383-5_12
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