We find in a fragment of Polybius, cited by Strabo, that the silver mines at the source of the river Bætis, in which forty thousand men were employed, produced to the Romans twenty-five thousand drachmas a day, that is, about five million livres a year, at fifty livres to the mark.
Estrabonek aipatzen duen Polibioren zati batean ikusten denez, Betis ibaiaren iturburuan zeuden zilar-meategietan berrogei mila gizonek egiten zuten lan, eta hogeita bost mila drakma ematen zizkieten erromatarrei eguneko;