Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Serra das Tulhas Mine, Cercal do Alentejo, Santiago do Cacém, Setúbal, Portugali
Regional Level Types
Serra das Tulhas MineMine (Abandoned)
Cercal do AlentejoCivil Parish
Santiago do CacémMunicipality
SetúbalDistrict
PortugalCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
37° 47' 55'' North , 8° 41' 58'' West
Latitude & Longitude (decimal):
Type:
Mine (Abandoned) - last checked 2024
Nearest Settlements:
PlacePopulationDistance
Cercal3,772 (2018)2.3km
São Luis1,006 (2018)9.7km
Porto Covo1,400 (2011)10.0km
Vila Nova de Milfontes4,393 (2012)11.1km
Almograve1,356 (2018)17.8km
Mindat Locality ID:
234285
Long-form identifier:
mindat:1:2:234285:9
GUID (UUID V4):
0
Name(s) in local language(s):
Mina da Serra das Tulhas, Cercal (Cercal do Alentejo), Santiago do Cacém, Distrito de Setúbal, Portugal


Old Fe-Mn mine.



Geologia da ocorrêncfia:
Tipos:
- ocorrências ferro manganesíferas, disseminadas e filonianas ligadas a distintas formações vulcano-sedimentares.
- ocorrências ferro manganesíferas, ligadas a processos metamórficos, estratiformes.
Génese: singenética e epigenética. Vulcanogénica e supergénica.
Descrição geológica: filão de quartzo e óxidos de ferro e manganês, com direcção média N50ºE, pendor 45º a 65ºE, extensão de 3 Km e possança maior que 4m. O muro é constituído por quartzo que atinge 15m de possança, a tecto é frequente a barite até 2m de possança e na parte central ocorre a mineralização útil de Fe-Mn com 4m de possança média, alcançando localmente 12m. A nordeste, onde termina o filão do Rosalgar, surgem as impregnações de Fe-Mn nos xistos da Serra do Lagar da Boavista.
Geologia local: complexo vulcano-silicioso do Cercal - antiforma do Cercal.
Geologia regional: Carbónico. Sector Cercal-Rio Mira.
Mineralizações principais: pirolusite, lepidocrocite (mica rubi), goethite (minério de ferro acicular), limonite.
Mineralizações secundárias: barite, hematite (oligisto), psilomelano, wad.
Distribuições: maciça, disseminada na rocha encaixante.
Morfologias: estratiforme, filão.
Gangas: quartzo.
Rochas encaixantes: tufitos ácidos, xistos.
Concessões: 33, 612, 615, 618, 95, 96, C78.
Ref: LNEG/Siorminp - Serras da Mina, das Tulhas e do Lagar da Bela Vista, Toca do Mocho, Cerro do Pinheiro da Bela Vista e Herdade da Mandurelha (1142FeMn).



Ref: José Maria da Costa Almeida e João José de Oliveira Barros (1946) - Jazigos de Ferro e Manganés de Odemira e Cercal, Mina de Serra de Tulhas - Direcção Geral de Minas e Serviços Geológicos - Servico do Fomento Mineiro No. 13.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


5 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.Fe3+O(OH)
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘPyrolusite4.DB.05Mn4+O2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Unclassified
ⓘ'Limonite'-
ⓘ'Manganese Oxides'-

List of minerals for each chemical element

HHydrogen
Hⓘ GoethiteFe3+O(OH)
OOxygen
Oⓘ BaryteBaSO4
Oⓘ GoethiteFe3+O(OH)
Oⓘ HematiteFe2O3
Oⓘ PyrolusiteMn4+O2
Oⓘ QuartzSiO2
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ BaryteBaSO4
MnManganese
Mnⓘ PyrolusiteMn4+O2
FeIron
Feⓘ GoethiteFe3+O(OH)
Feⓘ HematiteFe2O3
BaBarium
Baⓘ BaryteBaSO4

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.

References

 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 20, 2026 01:58:21 Page updated: August 12, 2025 20:40:34
Go to top of page