Midlothian Coalfield
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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 is less than 1% making it especially suitable for modern requirements.