Recovering TURAM geophysical data towards 3D modelling of the Caveira-Lousal mining area, southern Portugal
Fernando Almeida, Alexandre Guerra, Elsa Cristina Ramalho and João Xavier Matos
Journal name: First Break
Issue: Vol 36, No 8, August 2018 pp. 75 - 81
Special topic: Near Surface Geoscience
Info: Article, PDF ( 2.99Mb )
Price: € 30
The Iberian Pyrite Belt (IPB), partially located in the Alentejo region, southern Portugal, is known worldwide for the existence of several exploitable massive sulphide ores (e.g., the Neves Corvo copper and zinc ore) that have been supporting the activity of major mining companies for several decades. In 1944, the former Serviço de Fomento Mineiro (SFM) (currently the aboratório Nacional de Energia e Geologia, LNEG) introduced the use of geophysical methods applied to mining prospecting with the TURAM electromagnetic method through the ABEM Company (Gomes and Silva, 1955). Between the 1950s and 1970s the TURAM method became routinely used in every massive sulphide ore research project involving the institution and was relevant in the discovery of several IPB massive sulphide ores, such as Cerro do Carrasco, the upper part of the Aljustrel mine Moinho deposit, presently mined by the Almina Company (Gomes and Silva, 1955). The TURAM method is therefore an important part of the Portuguese mining prospecting heritage, since it was used for several decades and covered a very large research area in the Portuguese IPB and other interesting mining areas in the country and gave a strong contribution to the discovery of several sulphide ores. More than 3.500,000 TURAM stations, covering about 3500 documents, were acquired in these areas for about 30 years, before this method was replaced by the classical geoelectrical prospecting in the 1970s (Guerra, 2007). These data are presently stored at LNEG offices.