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"The São Domingos Mine is a deserted open-pit pyrite mine in São Domingos, Alentejo, Portugal. This site is one of the surfacing massive sulphide deposits in the Iberian Pyrite Belt, that extends from the south of Portugal into Spain. The Romans mined in the São Domingos area for gold and silver for about 400 years. Then Copper ore was the main product of the mine; in addition, pyrite was mined as a source of sulphur. About 25 megaton of ore had been extracted when the mine was closed in 1966.
Since closure the mine attracts tourists. Many old mine buildings and the open-cast pit remain. The old mining company headquarters has been converted into a hotel." From Wikipedia