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I am thinking of doing a study on Minllyn slate quarry near Dinas Mawddwy in Mid-Wales. I am hoping to include plans of the open cast and underground workings as well as old mining documents etc. I also would like to include the narrow gauge Railway which served the quarry. If anyone has any information (plans, etc) I would be very grateful if you could get in touch with me. Many Thanks, Alasdair Roberts.