DescriptionGraig Ddu Quarry - geograph.org.uk - 251537.jpg
English: Graig Ddu Quarry One of the few opencast quarries in the Blaenau Ffestiniog area. Underground work did not start here until the 1920s, eighty years after quarrying operations began. Much of the underground workings have been destroyed by untopping in the last 25 years.
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