Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Banjas Mines, Sobreira, Paredes, Porto, Portugali
Regional Level Types
Banjas MinesGroup of Mines
SobreiraCivil Parish
ParedesMunicipality
PortoDistrict
PortugalCountry

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Latitude & Longitude (WGS84):
41° 5' 28'' North , 8° 23' 41'' West
Latitude & Longitude (decimal):
Type:
Group of Mines
Nearest Settlements:
PlacePopulationDistance
Melres10,328 (2018)2.4km
Moreira11,336 (2018)3.9km
Rio Mau1,407 (2018)4.5km
Recarei4,856 (2012)7.1km
Foz do Sousa6,315 (2018)9.0km
Mindat Locality ID:
262841
Long-form identifier:
mindat:1:2:262841:0
GUID (UUID V4):
0
Name(s) in local language(s):
Minas das Banjas, Sobreira, Paredes, Distrito do Porto, Portugal


Pb-Sb-Au mines.

1 - Mining concessions in the parish of Sobreira:
2094 Poço Romano (Au), registered on 06-09-1944
196 Ribeiro da Castanheira (Pb), registered on 10-01-1887
187 Vale do Braçal (Pb-Au), registered on 09-01-1886

2 - Mining concessions in the parish of Melres, Gondomar:
248 Vargem da Raposa (Sb-Pb-Au), registered on 10-03-1893
244 Serra do Facho (Pb-Au), registered on 21-05-1892
233 Serra de Montezelo (Pb-Sb-Au), registered on 13-01-1890
212 Vale Fundo (Pb-Sb-Au), registered on 28-05-1888]



- Ocorrências de Ouro - disseminadas e filonianas ligadas a distintas formações vulcano-sedimentares
- Ocorrências de Ouro - filonianas, stockwerks e massas silicificadas em metassedimentos paleozóicos, afectados por cisalhamentos, carreamentos ou desligamentos tardios.
- Génese: epigenética, hidrotermal. Singenética, vulcano-sedimentar ou metamórfica. Paragénese As-Au (Pb-Zn).
- Descrição geológica: estruturas filonianas e pequenas massas, por vezes com apófises, de quartzo brechóide e subverticais. Camadas argilosas negras, em antiformas menores, com veios de quartzo aurífero centimétricos interestratificados, ricos em arsenopirite de baixa temperatura e pirite. Existem 3 tipos de mineralizações com idade D1/D3: (1) estratiforme, com pirite e rara calcopirite associada a quartzo, paralela a estratificação; (2) disseminada, com pirite impregnada na rocha; (3) fissural, só com pirite ou associada a quartzo e clorite, de origem nitidamente hidrotermal.
Geologia local: predominam as alternâncias de quartzitos e xistos do Arenigiano, no flanco oriental do anticlinal de Valongo, provavelmente afectadas pela zona de cisalhamento de Santa Justa (D1/D3).
Geologia regional: Arenigiano.
in LNEG, Dec 2014.

O Couto Mineiro das Banjas localiza-se no flanco leste do Anticlinal de Valongo e está inserido na Faixa Auroantimonífera do Douro. É constituído por seis concessões (Poço Romano, Ribeiro da Castanheira, Vale do Braçal, Vale Fundo, Serra de Montezelo, Vargem da Raposa e Serra do Facho), estendendo-se desde a Sobreira (Concelho de Paredes) até Melres (Concelho de Gondomar).
Nesta zona mineira foram explorados Chumbo (Pb), Antimónio (Sb) e Ouro (Au). Os filões de quartzo aurífero foram intensamente explorados pelos Romanos, do que, ainda hoje, são testemunhos os importantes desmontes, a céu aberto e subterrâneos, e o espólio encontrado. Durante os finais do século XIX até meados do século passado foi uma importante zona de produção de antimónio, extraindo-se muitas vezes o ouro como subproduto.
Para além de todos os trabalhos de exploração que aqui se encontram, pode ainda observar-se o que resta das antigas instalações das Minas das Banjas onde funcionaria a lavaria e, onde se realizaria o tratamento do minério.



Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


6 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Native Gold
var. Electrum
1.AA.05(Au,Ag)
1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Stibnite2.DB.05Sb2S3
Pyrite2.EB.05aFeS2
Arsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
'Wolframite Group'4.DB.30 va

List of minerals for each chemical element

OOxygen
O QuartzSiO2
SiSilicon
Si QuartzSiO2
SSulfur
S ArsenopyriteFeAsS
S GalenaPbS
S PyriteFeS2
S StibniteSb2S3
FeIron
Fe ArsenopyriteFeAsS
Fe PyriteFeS2
AsArsenic
As ArsenopyriteFeAsS
AgSilver
Ag Native Gold var. Electrum(Au,Ag)
SbAntimony
Sb StibniteSb2S3
AuGold
Au Native Gold var. Electrum(Au,Ag)
Au Native GoldAu
PbLead
Pb GalenaPbS

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
EuropeContinent

This page 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.

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