Compra de las minas por la Rio Tinto Company Limited Historical milestone · Minas de Riotinto, Cuenca Minera, Huelva In 1873 the Spanish state sold the Riotinto mines to a British consortium that formed the Rio Tinto Company Limited, the seed of today's Rio Tinto mining multinational and the driving force behind the comarca's industrialisation for almost a century. 1873 Photo: Carmenguada (CC BY-SA 3.0) What to see and do in Minas de Riotinto