4-520: The Midlothian Coalfield is a coalfield in southeast Scotland situated immediately to the east and southeast of Edinburgh . It is geologically continuous with the East Fife Coalfield beneath the Firth of Forth though the undersea coal reserves have only been partly exploited. There were undersea workings extending from Prestonlinks Colliery. The sulphur content of the majority of Midlothian coals
8-482: Is an area of certain uniform characteristics where coal is mined. The criteria for determining the approximate boundary of a coalfield are geographical and cultural, in addition to geological. A coalfield often groups the seams of coal, railroad companies, cultural groups, and watersheds and other geographical considerations. At one time the coalfield designation was an important category in business and industrial discussions. The terminology declined into unimportance as
12-653: Is less than 1% making it especially suitable for modern requirements. The following seams were worked. They are shown in rough stratigraphical order thought not all seams are present throughout the coalfield. Those shown in bold were worked to the greatest extent: Within the Scottish Coal Measures Group (Middle and Lower Coal Measures): Within the Upper Limestone Formation: Within the Limestone Coal Formation: Within
16-674: The Lower Limestone Formation Within the West Lothian Oil-Shale Formation Monktonhall Colliery was abandoned in 1997 and Blinkbonny mine adit was sealed in 2003 so bringing to an end a long history of deep-mining of coal within the coalfield. Opencasting has continued at various sites since then including Blinkbonny, Oxenfoord, Gourlaw and Newbigging Farm. 55°54′N 3°06′W / 55.900°N 3.100°W / 55.900; -3.100 Coalfield A coalfield
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