Publisher's Synopsis
Excerpt from Special Reports on the Mineral Resources of Great Britain, Vol. 9: Iron Ores (Contd.), Sundry Unbedded Ores of Durham, East Cumberland, North Wales, Derbyshire, the Isle of Man, Bristol District and Somerset, Devon and Cornwall
This volume deals with some relatively unimportant sources of unbedded iron-ore, in various parts of England and Wales specified below. The ores occur as irregular bodies, pockets, ?ats, and veins. The table on page 3 shows the districts referred to, together with the outputs 111 tons for the three years preceding the war; for purposes of comparison the figures for Cumberland and Lancashire also are given.
In the Carboniferous and Devonian limestones the haematite forms ?ats, pockets, and vein-like masses; in the older Palaeozoic rocks of the Isle of Man, and in the Coal Measures of the Bristol district South Gloucestershire and North Somerset), it occurs as true veins; in the Dolomitic Conglomerate (trias) of the last named district it is present as lenticular masses. In the Devonian Slates of West Somerset and North Devon, in the Carboniferous Limestone Series of Durham and East Cumberland, and 'in the Granite and Killas of South Devon and Cornwall, the spathic ore odours in true veins, though at the surface it has generally changed into haematite and Iimonite. In South Devon and Cornwall the specular ores form true veins, and the magnetite occurs usually in lenticles associated with basic igneous rocks, from which it was probably derived by magmatic segregation.
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