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Preguiça Mine, Sobral da Adiça, Moura, Beja District, Portugal

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Name(s) in local language(s): Mina da Preguiça, Sobral da Adiça, Distrito de Beja, Portugal
 
Fe-Zn-Pb mine, 5 km SE of Sobral da Adiça (1914/5 to 196?).

Included in the Preguiça-Vila Ruiva mining field (mining concessions 363 628 629 630).

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Tipos de ocorrência:
Ocorrências de Ferro - Ligadas a vulcanismo - Estratiformes
Ocorrências de zinco e chumbo - Ligadas a vulcanismo - Estratiformes
Ocorrências de zinco e chumbo - Ligadas a processos supergénicos - Gossans

Descrição: À superfície, quer em Vila Ruiva quer na Preguiça, ocorrem chapéus de ferro, principalmente, no seio de dolomias câmbricas dispostas em anticlinório; em profundidade, ocorrem mineralizações de Zn-Pb(Ag) em camadas tabulares orientadas N45º W e 50º E, com minério compacto e bolsadas de minério terroso, associados a calcários dolomíticos em cujo seio aparecem impregnações de pirite, galena e calcopirite e situadas na proximidade de vulcanitos. As mineralizações de Zn-Pb(Ag) são pré-orogénicas. Existem ainda camadas hematíticas independentes das mineralizações anteriores e interestratificadas em xistos, que se estendem por 1.500 m com rumo N60ºW, pendor suave para NE e possança média de 3 m.
Mineralizações Principais: Galena, Goethite (Minério de ferro acicular), Hematite (Oligisto), Hidrozinquite (Flor de zinco), Siderite (Espato ferroso), Smithsonite (Espato de zinco, Calamina)
Morfologias: Estratiforme, Gossan
Rochas Encaixantes: Calcários cristalinos, Dolomitos, Xistos
Geologia Local: Anticlinório de Moura-Ficalho. Complexo Vulcano-sedimentar.
Geologia Regional: Câmbrico. Silúrico.
Fonte: LNEG


Occurrence types:
Iron occurences - linked to volcanism – stratiform.
Zinc and lead occurrences -linked to volcanism – stratiform.
Zinc and lead occurrences - linked to supergenic processes – gossans.
Geological description:
On the surface either in Vila Ruiva or in Preguiça, iron caps occur mainly on Cambrian dolomites arranged in anticlinorium; at depth, Zn-Pb (Ag) mineralization occurs in tabular layers oriented N 45 W, dipping 50° E, with compact ore and earthy ore pockets, associated with limestones containing several impregnations of pyrite, galena and chalcopyrite in close proximity to volcanic rocks. The Zn-Pb (Ag) mineralization is pre-orogenic. There are layers of hematitic mineralization that are interstratified in “mineralized schists” and are independent of the previously referred impregnations, which extend for 1,500 m (striking N 60 º W), with a smooth gradient and a 3 m thickness.
Main minerals: Galena, Goethite, Hematite, Hydrozincite, Siderite, Smithsonite.
Morphologies: stratiform, gossan.
Host rocks: crystalline limestone, dolomites, shales.
Local geology: Moura Anticlyn-Ficalho. Volcano-Sedimentary Complex.
Regional geology: Cambrian. Silurian.
Souce: LNEG

Mindat Articles

Bats on the Rocks by Rui Nunes
Mining field of Preguiça and Herdade de Vila Ruiva by António Manuel Ináçio Martins


Mineral List



23 entries listed. 21 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Martins da Silva, J. & de Araújo, C. (1948): Estudo da concessão Umbria da Preguiça e dos campos livres Herdade da Preguiça, sítio do Álamo e Herdade do Álamo. Estudos, Notas, Trabalhos de Servico de Fomento Mineiro, 4(3-4), 197-209.

Patinha, C., Ferreira da Silva, E., Reis, P. & Cardoso Fonseca E. (2004): Imagem Cartográfica do Cu, Pb e Zn na envolvente das minas da Preguiça e Vila Ruiva (Sul de Portugal) utilizando a extracção química selectiva, Revista da Faculdade de Ciencas N°1, Edicão especial 2004 ,74-92.

Pimentel, R., Nunes, R. & De Ascenção, R.(2007): Les minéraux d'altération de plomb (Pb) et zinc (Zn) du massif de Preguiça, Moura, Portugal. Le Règne Minéral, 75, 19-26.

Rosell, J., Viñals, J., Clemente, F. & Alcuña, F.J. (2008): Mina da Preguiça, Lead and Zinc Supergenic Minerals. Freguesia de Sobral da Adiça, Concelho de Moura, Beja, Alentejoa, Portugal. Mineral Up, Vol. I, Nr. 6 (2/2008), pages 6-20. Also in Spanish language in Revista de Minerales.


External Links

http://www.mindat.org/article.php/1631 - Mindat article "Portuguese Ossa-Morena Zone Mining" by Martins da Pedra.

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