The Story of Mary Herbert and Joseph Gage. Lady Mary Herbert, daughter of the second Marquess of Powis, and her lifelong admirer Joseph Gage, were legendary 18th-century adventurers who ran the Guadalcanal and Rio Tinto mine from the late 1720s to 1740s.

Andalucía is a region rich in minerals. There are two distinct geological zones which are divided by the River Guadalquivir basin and its East North-East/West South-West axis.