In 1548 a muleteer at the service of Don Rodrigo, lit a bonfire on top of a canyon for protection from cold and found traces of silver among the ashes. This was the discovery of the mining district of Valenciana of which the Guadalupe Mine was part. Currently considered as a World Heritage Site, it retains the impressive wall surrounding the shaft, supported by buttresses which resemble elephant’s trunks and cause the popular name "Elephant Mine".