EGU2020-10228
https://doi.org/10.5194/egusphere-egu2020-10228
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

FRAME: towards conflict-free Nb-Ta for the European Union

Helge Reginiussen1, Erik Jonsson1,2, Susana María Timón Sánchez3, Alejandro Díez Montes3, Klemen Teran4, Rute Salgueiro5, Augusto Filipe5, Carlos Inverno5, and Daniel P.S. de Oliveira5
Helge Reginiussen et al.
  • 1Geological Survey of Sweden, Box 670, SE-751 28 Uppsala, Sweden
  • 2Department of Earth Sciences, Uppsala University, SE-75236 Uppsala, Sweden
  • 3Instituto Geológico y Minero de España, Plaza de la Constitución, nº1, Planta 3ª, 37001 Salamanca, Spain
  • 4Geological Survey of Slovenia, Dimičeva ulica 14, 1000 Ljubljana, Slovenia
  • 5Laboratório Nacional de Energia e Geologia, Apartado 7586, Alfragide 2610-999 Amadora, Portugal

The GeoERA FRAME project focuses on several of the main raw material-related objectives of the EU Commission. FRAME work package 6 (WP6), targets so-called conflict minerals, chiefly those mined to extract niobium (Nb) and tantalum (Ta).  These chemically related critical metals are essential components in a range of applications and products including electronics, steel alloys and superalloys widely required by the European industry. Today, significant amounts of Ta and associated Nb are sourced as conflict minerals from the central African region, not least the DRC (Congo-Kinshasa).

A main objective of FRAME WP6 is to do a survey of the European distribution of these metals and their deposits, thus enhancing their exploration interest and potential to help enable ethical and indigenous production for the EU.

While WP6 compiles data on Nb-Ta mineralisations from the whole of Europe, the main focus is put on the Swedish part of the Fennoscandian Shield and the Iberian Variscan Massif.

The Nb-Ta mineralisations of the Iberian Peninsula belong to the southwestern extension of the European Variscan Belt. From both an economic and a metallogenetic point of view, the most interesting Nb-Ta deposits in Spain are those in which mineralisation occurs as disseminations throughout small leucogranite bodies, as is the case for the deposits Golpejas, El Trasquilón, Fontao, Penouta and in some occurrences of the Morille-Martinamor district. These have been exploited previously for Sn, Ta-Nb, and/or W. Penouta, which is the biggest known Ta-deposit in Spain, was mined intermittently between 1906-1985. The mine has recently started re-processing old tailings. Most Nb-Ta mineralisations in the Fennoscandian Shield are hosted by LCT-type (lithium-cesium-tantalum-enriched) granitic pegmatites that occur mainly in regions featuring abundant Palaeoproterozoic low to low- medium-grade metasedimentary rocks and associated S-type granites. Some of these have been studied during different earlier exploration campaigns. NYF-type (niobium-yttrium-fluorine-enriched) granitic pegmatites occur as individual dykes and fields throughout the Proterozoic bedrock of Sweden. Research in WP6 will focus on a few selected Swedish deposits and occurrences including Järkvissle and Bergby in central Sweden, as well as Stripåsen, Utö and other rare-element pegmatites in the Bergslagen province. Emphasis during the start of the project was to identify key areas and mineralisations within these two regions that can be studied in detail.

Based on available information in the databases and archives of the partner surveys, a list of Nb-Ta occurrences and deposits has been produced. Ultimately, at the end of the project, a report on the distribution and systematics of Nb-Ta mineralisations in Europe will also be produced. Prospective regions and their character of mineralisation will be summarized together with the overall European potential, in order to develop recommendations for future exploration. Furthermore, a discussion of conditions of Nb-Ta production in central Africa with the aim to suggest improvement to these issues will be made. The potential of intra-European production of Nb-Ta to decrease the present near-total dependence on imports will also be assessed. As another outcome, an Inspire-compatible pan-European dataset of Nb-Ta mineralisations will be provided to the GeoERA information platform.

How to cite: Reginiussen, H., Jonsson, E., Timón Sánchez, S. M., Díez Montes, A., Teran, K., Salgueiro, R., Filipe, A., Inverno, C., and de Oliveira, D. P. S.: FRAME: towards conflict-free Nb-Ta for the European Union , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10228, https://doi.org/10.5194/egusphere-egu2020-10228, 2020

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