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    Manylion
    Delweddau
    Safleoedd Cysylltiedig
    Archifau Cysylltiedig
    NPRN505680
    Cyfeirnod MapSH55NE
    Cyfeirnod GridSH5573959853
    Awdurdod Unedol (Lleol)Gwynedd
    Hen SirSir Gaernarfon
    CymunedLlanberis
    Math O SafleMWYNGLAWDD PRAWF
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    Disgrifiad
    A single small mine trial located to the north-east of Bryn-mawr quarry (NPRN 400669). It measures 6m in diameter and is up to 1m deep with upcast spoil to the north. P.J. Schofield, OANorth, 13th June 2007