South Maria Mine
From Graces Guide
South Maria Mine, which includes the minerals under the Tamar river, is in the parish of Calstock, union of Liskeard, hundred of East, Cornwall, within the bounds of the manor of Calstock, and mining district of Callington, and adjoins the well-known Devon Great Consols Mines.
1844 This mine was first opened, and was worked by George Croker Fox and others under the name of Tincroft.
1856 Afterwards was worked by Thomas Bartlett, Esq., under the name of South Maria