For its size the South Staffordshire coalfield has proved itself the richest mineral area in Britain. Thick coal seams, rich bands of ironstone, and great thicknesses of Silurian limestone, all occur within a short distance of each other, and all within easy reach of the miner. The natural result has been that the South Staffordshire coalfield and its immediate neighbourhood has been the great coal and iron mart of Central Britain, and the abundance and cheapness of its material it has afforded, have rendered Birmingham and the “Black Country” the hardware workshop of the world. Almost all the available coal seams and ironstone beds within easy reach have been long since practically worked out, but there is still much excellent coal and iron to be obtained at greater depths, especially in the northern part of the coalfield. Of late years the Triassic rocks which surround the coalfield have been pierced in order to reach the Coal measures beneath. An entirely new coalfield has been developed in this manner in the district of Cannock Chase; and two most remarkable collieries, those of Sandwell Park, and Hamstead, have been opened in the neighbourhood of Birmingham itself. The area immediately underlain by the Coal measures constitutes the district of the “Black Country,” which extends from the western margin of Birmingham to the fringe of Cannock Chase. It includes within its limits, the large towns of Dudley, Walsall, Wolverhampton, Bilston, and others of scarcely less note.