The structure at Mamucky is a wedge tomb, a type of megalithic burial monument built during the late Neolithic and early Bronze Age, typically characterised by a narrow gallery that widens and rises slightly toward its entrance end. This particular example is remarkably small, the gallery measuring just 1.5 metres long and roughly 0.75 metres wide, oriented northwest to southeast on a gentle southwest-facing slope.

Despite its modest scale, the tomb retains several of its original structural elements. A single sidestone survives to the north and another to the south, with an inset backstone closing the eastern end of the chamber. A single roofstone still caps the gallery, which is more than many comparable sites can claim. One of the more curious details is a transversely-set stone at the western end of the northern side, which may represent part of a facade or entrance feature, the kind of framing that would have given the monument a more pronounced face toward the living when it was in active use. A split buttress-stone has been pressed into service supporting the southern sidestone, suggesting some structural movement over the millennia. Less romantically, a quantity of field clearance debris has been piled against the northern side at some point, the accumulated result of farmers working the surrounding land and treating the ancient stonework as a convenient dumping spot. Seán Ó Nualláin, who catalogued the site in 1989, recorded these details as part of a broader survey of Cork's megalithic heritage.