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"Great Western Mine, also known as Hetty Pit, was a coal mine, at Hopkinstown, ........The mine was opened, as "Gyfeillon Pit", in August 1851 by John Calvert, an engineer from Yorkshire, ..." wikipedia
For full and up-to-date details of their holdings see the sites of Glamorgan Record Office and/or West Glamorgan Archives
Transcript of name listing for Pontypridd, and district, from Commercial and Trade Directories, for the years:-
Ask for a calculation of the distance from Gyfeillon in the Parish of Llanwonno to another place.