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- Chemical composition of submarine massive sulphides in the Lucky Strike hydrothermal fieldPublication . Ferreira, Pedro Tavares; Inverno, Carlos; Silva, Teresa; Schiellerup, Henrik; González, JavierSUMÁRIO: No segmento Lucky Strike, localizado na Crista Média da região dos Açores, existe um dos maiores campos submarinos hidrotermais activos do nosso planeta. Para além da existência de dezenas de chaminés hidrotermais expelindo fluidos a elevadas temperaturas (~325 ºC), uma área significativa com cerca de 1 km2 é constituída por um substrato rochoso formado por placas hidrotermais e sulfuretos maciços polimetálicos. Durante a campanha oceanográfica TTR-10, oito locais desta área foram amostrados resultando um conjunto de rochas que foram incluídos em três grupos: 1) fragmentos de chaminés hidrotermais, com a estrutura original preservada; 2) fragmentos irregulares de sulfuretos maciços sem estruturação (“sulphide rubble”); 3) Fragmentos de rochas basálticas com variáveis graus de alteração hidrotermal. Neste trabalho apresentam-se as principais características químicas (elementos maiores e traço) e mineralógicas destes três tipos de rochas.
- The role of EuroGeoSurveys’ Mineral Resources Expert Group in the European minerals contextPublication . de Oliveira, Daniel Pipa Soares; Stanley, G.; Schiellerup, Henrik; Pfleiderer, Sebastian; Solar, Slavko; Ponce Leao, Maria Teresa; Arvanitidis, NikolaosABSTRACT: Europe shows an inevitably growing and accelerating consumption of mineral commodities and the high import dependence of strategic and critical raw materials has a serious impact on the sustainability of the EU manufacturing industry. The European Commission has long recognized the challenge of sustainable supply of mineral raw materials and steps are implemented to try to deal with this. In this context, EuroGeoSurveys and its Mineral Resources Expert Group (MREG) serve as one of the contact points for the Commission. The MREG is a group of earth scientists, experts in Economic Geology that act under the umbrella body of EuroGeoSurveys. The group acts upon requests and queries received by member states and the European Commission and provides the best available mineral expertise and information based on the knowledge of member Geological Surveys, for policy, communication, public awareness and education purposes at European level.
- GeoERA Raw Materials Monograph : the past and the futurePublication . Wittenberg, Antje; de Oliveira, Daniel Pipa Soares; Flindt Jørgensen, Lisbeth; González, Javier; Heldal, Tom; Aasly, Kari Aslaksen; Deady, Eimear; Kumelj, Špela; Horvath, Zoltan; McGrath, Eoin; Ferreira, Maria João; Calabaça, Teresa; Arvanitidis, Nikolaos; Sadeghi, Martiya; Bertrand, Guillaume; Gloaguen, Eric; Decree, Sophie; Gautneb, Håvard; Törmänen, Tuomo; Reginiussen, Helge; Sievers, Henrike; Quental, Lídia; Pereira, Aurete; Medialdea, Teresa; Schiellerup, Henrik; Zananiri, Irene; Ferreira, Pedro Tavares; Somoza, Luis; Monteys, Xavier; Alcorn, Trevor; Marino, Egidio; Lobato, Ana Belén; Kuhn, Thomas; Nyberg, Johan; Malyuk, Boris; Magalhães, Vítor Hugo; Lunar, Rosario; Hein, J. R.; Cherkashov, Georgy; Brown, Teresa; Cassard, Daniel; Urvois, Marc; Pedersen, Mikael; Schjøth, Frands; Tulstrup, Jørgen; Eilu, Pasi; Hokka, Janne; Simoni, Mark; Carvalho, Jorge; Laskaridis, Kostas; Dedić, Željko; Habimana, Cyprien; Liinamaa-Dehls, AnneABSTRACT: GeoERA Minerals projects have produced data aimed at supporting Europe’s minerals sector and to assist the European Commission to realise its goals for raw materials. Data has been compiled on mineral occurrences and mineral provinces across Europe, in particular, areas with potential to host Critical Raw Materials. Anecdotal evidence from the minerals sector provides an indication of the likelihood of exploration leading to mine development. For every 1,000 mineral showings examined, only 100 may receive further exploration work and of those 100, only 10 may warrant more detailed sampling either through trenching, drilling or other means and of those 10 only 1 may proceed to an evaluation through a full feasibility study which itself has only 50% chance of being positive. Following this, any project for which a mine proposal is made must undergo a full evaluation and permitting by authorities including full public consultation. The proposal may or may not pass this scrutiny. In terms of a schedule, the generally accepted minimum time frame from discovery to production is 10 years and usually much more, up to 20 years.