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Minerals 2017, 7(12), 234; https://doi.org/10.3390/min7120234

A 3D Geological Model of a Vein Deposit Built by Aggregating Morphological and Mineral Grade Data

1
Earth Sciences Department, Faculty of Sciences and Technology, NOVA University of Lisbon, GeoBioTec, Quinta da Torre, 2829-516 Caparica, Portugal
2
Institute of Earth Sciences, University of Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
Received: 29 August 2017 / Revised: 17 October 2017 / Accepted: 22 November 2017 / Published: 26 November 2017
(This article belongs to the Special Issue Geological Modelling)
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Abstract

The objective of this study was to establish a methodology for building a 3D geological model of a mineral vein deposit, encompassing morphology and wolframite content. The available data set includes stope data (vein thickness and wolframite quantity) and borehole data (vein thickness and wolframite modal classes). The data captured from boreholes and stopes differ in terms of their spatial distribution and clustering as well as the size and shape of each sample. Therefore, a specific methodology was designed to combine these two sources of information. The morphology model mapped vein thickness as a vein proportion variable, by applying a two-phase Direct Sequential Simulation (DSS) locally conditioned to borehole data. Regarding the evaluation of wolframite content, the variables are unable to be related directly to each other and are non-co-located. Therefore, a proximity study was made using DSS to build local conditional cumulative histograms (by borehole class and by mine level). The final model of wolframite quantity was generated using Probability Field Simulation. The proposed approach considers the initially identified problems, allowing the mineral potential of the deposit to be quantified by integrating the results of the two independent methodologies. View Full-Text
Keywords: morphology model; mineral content model; geostatistical simulation; vein deposits; critical raw materials morphology model; mineral content model; geostatistical simulation; vein deposits; critical raw materials
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sanches, A.; Almeida, J.; Sá Caetano, P.; Vieira, R. A 3D Geological Model of a Vein Deposit Built by Aggregating Morphological and Mineral Grade Data. Minerals 2017, 7, 234.

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