The Alexandria Mine is located along the E&N Railway, west of South Wellington. The mine produced high volatile, bituminous rank coal between 1884 to 1902. The coal is part of the Douglas Seam which occurs within the Upper Cretaceous Nanaimo Group, Pender Formation (Newcastle Member). The seam varies in thickness from 0.1 to 9.1 metres and is underlain by undulating shales. Overlying the coal seam, which tends to be sheared with abundant slickensides, are sandy shales and minor conglomerate of the Protection Formation, Nanaimo Group.

The Alexandria Colliery, which processed the volatile coals, also manufactured coke, as well as fire brick and ordinary brick.

See South Wellington No. 5 (092GSW038) for production from 1931 to 1935.