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    Manylion
    Delweddau
    Safleoedd Cysylltiedig
    Archifau Cysylltiedig
    NPRN261904
    Cyfeirnod MapSO00NW
    Cyfeirnod GridSO0427005360
    Awdurdod Unedol (Lleol)Merthyr Tudful
    Hen SirGlamorgan
    CymunedCyfarthfa
    Math O SafleSIAFFT AWYRU
    CyfnodÔl-Ganoloesol
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    Disgrifiad
    Rectangular brick structure c.1.2 x 0,5m open to c.1m at present. Located in linear area of collapse directly above level tunnel; presumably a ventilation shaft sunk into the workings.