A lime kiln is essentially a stone-built furnace in which limestone was heated to produce quicklime, used widely across Irish farms to improve acidic soils and to make mortar. What makes this particular structure quietly notable is that it was one of a pair operating in the same area, both recorded on the Ordnance Survey six-inch map of 1839, suggesting that demand for lime in this part of Carlow was substantial enough to sustain two such facilities in close proximity.

The 1839 Ordnance Survey mapping was among the most detailed cartographic exercises undertaken in Ireland up to that point, and the fact that both kilns were considered worth marking speaks to how central lime burning was to the rural economy of the period. Farmers would haul limestone and fuel, often coal or culm, to these structures, burning the stone over days to produce the calcium oxide needed for their land. The presence of two kilns in the Ouragh area hints at either a particularly active local limestone source or a wider network of agricultural activity that kept both structures in regular use during the early nineteenth century.