a town in Spain, in the province of Ciudad Real, with 9000 inhabitants. It is distinguished by the rich mines of quicksilver in its vicinity. Formerly these mines were wrought partly by convicts, but now wholly by free labourers. The government of late years has leased these mines to private speculators. In 1848 they yielded 40,000 quintals of mercury. The principal mines are at Almaden, and at Almadenejos, two leagues from the former, with some less important in Valencia. The whole amount of quicksilver obtained in Spain in 1848 was 48,868 quintals, or about 40,578 cwt. Lat. 38. 41. N. Long. 4. 49. W.