A lime kiln is essentially an industrial furnace in which limestone was heated to extreme temperatures to produce quicklime, a material used extensively in agriculture to reduce soil acidity and in construction as the base for mortar and whitewash. Kilns of this kind were once common features of the Irish countryside, positioned near quarries to minimise the hauling of raw stone, and their presence in the landscape speaks quietly to the practical demands of farming and building in earlier centuries.

The Mohera example follows the typical construction logic of a field kiln: it is set into the hillside so that limestone and fuel could be loaded from above, while the calcined lime was drawn out through the arched recess at the front. That opening measures roughly two and a half metres high, just over two metres wide, and about two and a half metres deep, with sloping slabs running to the rear of the draw hole. The overall structure is a substantial one, the six-metre frontage suggesting a kiln built for serious local output rather than occasional use. The top of the kiln is now heavily overgrown, which is common for structures of this kind once they fell out of use, the vegetation gradually softening what were originally stark industrial forms.