The Historic Environment Record makes reference to a medieval coal working at Ravensworth Manor:

"In 1356 Sir John Lumley granted to Sir Robert Umfravill "the site, demesne, park, meadows and pasture of the manor of Raueneshelme, which Eleanor, who was wife of Richard Fitz-Marmaduke, holds for life and of which Sir John has the reversion. To hold for one year and six weeks after the death of the said Eleanor, taking in that time as much coal there as can be worked by four men in one pit"."

Unfortunately the exact site isn't known, but the Coal Authority states 3 seperate sites at Old Ravensworth.