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Penrhyn Castle

ABERLLEFENNI SLATE QUARRY

MINERA LEAD MINES: MEADOW SHAFT LEAD MINE;CITY...

ABERLLEFENNI SLATE QUARRY

CROESOR SLATE QUARRY

PENARTH SLATE QUARRY, CORWEN

ESGAIR MWYN LEAD MINE, EARTHWORK COMPLEX

RHOSYDD SLATE QUARRY

CLOGAU SLATE QUARRY

CLOGAU SLATE QUARRY

BRYN-YR-ARIAN LEAD MINE [DISUSED], SE OF TRE&...

BRYNDYFI LEAD MINE; NEUADD LWYD LEAD MINE,...

POWELL'S LLYWERNOG MINE, PONTERWYD

GORSEDDAU SLATE QUARRY

VIVIAN SLATE QUARRY

GORSEDDAU SLATE QUARRY

YR EIFL QUARRY; TREVOR QUARRY

VIVIAN SLATE QUARRY

PENARTH SLATE QUARRY, CORWEN

VIVIAN SLATE QUARRY

ABERLLEFENNI SLATE QUARRY

GORSEDDAU SLATE QUARRY

DINORWIC SLATE QUARRY

BWLCH GWYN LEAD MINE;GWAITH NEWYDD YSTUM TUEN

POWELL'S LLYWERNOG MINE, PONTERWYD

MINERA LEAD MINES: NEW MINERA LEAD MINE, MINERA

CLOGAU SLATE QUARRY

VIVIAN SLATE QUARRY

MOEL FFERNA, SLATE MINE

PENARTH SLATE QUARRY, CORWEN