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Browsing RM - Capítulos de livros by Author "de Oliveira, Daniel Pipa Soares"
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- Europe’s Raw Materials Supply Chain: Front-End ConsiderationsPublication . Wittenberg, Antje; de Oliveira, Daniel Pipa Soares; Bide, Tom; Hollis, Julie; Nirgi, Siim; Žibret, Gorazd; Gautneb, Håvard; Sadeghi, Martiya; Domínguez, Rafael Navarro; Malyuk, BorisABSTRACT: Supply chains are linked for specific purpose and by something. Hence, the respective links of the chain must be hooked in the right place, sufficiently strong, and have to start somewhere. This chapter looks at the raw materials supply chain as the first link in a commodity supply, from the European Union (EU) perspective. Aspects of the raw material potential of critical or strategic mineral resources in Europe, its further exploration, and the concept of modifying factors are considered, and reporting systems of resources and reserves are described, underpinned by examples of mineral potentials in different regions of the EU. Thus, targeted exploration of raw materials, especially within the framework of national geological research, serves to support a sustainable and resilience supply chain. EU projects, such as GeoERA and Geological Service for EU, assist in shaping the tailor-made exploration programs fit for providing mineral data publicly available through EuroGeoSurveys’ European Geological Data Infrastructure. In the future, raw materials may be seen as global public goods required to address many challenges, from the climate crisis to geopolitical instability; therefore, the society could conceptualize them in a new way, from a dominant investment returns-oriented viewpoint to one linked to delivering global objectives.
- Germanium-rich chalcopyrite from the Barrigão remobilised vein deposit, Iberian Pyrite Belt, PortugalPublication . Reiser, Fiona K. M.; Guimarães, Fernanda; Pinto, Álvaro M. M.; Matos, João Xavier; Carvalho, João R. S.; de Oliveira, Daniel Pipa Soares; Rosa, DiogoAnomalously high germanium contents have been detected by means of whole-rock trace element analysis in remobilised vein type copper ores from the abandoned Barrigão mine, located in the Iberian Pyrite Belt, southern Portugal. The late-Variscan brecciated copper ores consist manly of chalcopyrite, with minor tennantite, rare pyrite and arsenopyrite. The ores, investigated for elements increasingly used in several thin-film and other semiconductor high-technology applications (e.g. indium, selenium, tellurium and germanium), show germanium contents up to 280 ppm, with an average of 61 ppm from 10 samples. Electron Probe Microanalysis of Barrigão ore samples revealed that germanium is contained in chalcopyrite, with a range of 0.1 to 0.4 wt% (0.23 wt% average). High germanium contents seem to be linked to "dirty" chalcopyrite phases, showing irregular patchy zoning under the microscope and on back-scattered electron images.
- Indium in the Lagoa Salgada Orebody, Iberian Pyrite Belt, PortugalPublication . de Oliveira, Daniel Pipa Soares; Rosa, Diogo; Matos, João Xavier; Guimarães, Fernanda; Figueiredo, M. Ondina; Silva, TeresaThe Iberian Pyrite Belt (IPB) is one of the most outstanding ore provinces in Europe hosting some of the largest concentrations of massive sulphides and 22% of the world-class (> 32 Mt) VMS orebodies. A significant number of (pyrite) mines are now inactive but some orebodies still remain unexploited; this is the case of Lagoa Salgada. It is the most NW orebody known and occurs beneath approximately 130 m of Cenozoic sediments which limits interpretation solely to borehole intersection data. The orebody is folded and interpreted to occur on the subvertical-overturned and intensely faulted limb of a SW verging anticline. It is hosted within a thick IPB volcanic sedimentary sequence and is made uo of a centralstockwork and a massive sulphide lens. An electron microprobe study revealed consistent trace amounts of indium in sphalerite, thus contrasting with the neighbouring Neves Corvo mine where indium is known to occur associated with stannite and stanoidite. The occurrence of elevated trace amounts of indium in sphalerite from Lagoa Salgada could make this orebody an attractive economic target beyond the traditional tin-base metal suite so far extracted in the Iberian Pyrite Belt.
- Mineralizações no sector português da Zona de Ossa MorenaPublication . Mateus, António; Munhá, José; Inverno, Carlos; Matos, João Xavier; Martins, Luís Plácido; de Oliveira, Daniel Pipa Soares; Jesus, Ana; Salgueiro, Rute
- Mining heritage and economic potential of the wastes of the S. Domingos minePublication . Batista, Maria Joao; Matos, João Xavier; Figueiredo, M. Ondina; de Oliveira, Daniel Pipa Soares; Pereira, Zélia; Silva, Teresa; Santana, Helena; Quental, Lídia
- Recursos geológicos : recursos minerais metálicos : recursos minerais não metálicosPublication . de Oliveira, Daniel Pipa Soares; Lisboa, Jose