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

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Latitude & Longitude (WGS84): 38° 2' 35'' North , 7° 17' 45'' West
Latitude & Longitude (decimal): 38.04333,-7.29611
Other regions containing this locality:Iberian Peninsula
Köppen climate type:Csa : Hot-summer Mediterranean climate
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).

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.
(free translation)

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


21 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cambrian-Ordovician
443.8 - 541 Ma



ID: 1377414
Cambrian-Ordovician mixed volcanic, volcaniclastic and sedimentary rocks

Age: Paleozoic (443.8 - 541 Ma)

Comments: This designation includes Precambrian iron-formation-bearing sedimentary and volcanic sequences, as well as mixed sedimentary and volcanic or volcaniclastic sequences.

Lithology: Mixed volcanic, volcaniclastic and sedimentary rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

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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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