The example at Killaloonty, in County Galway, is one of countless such structures that once formed the backbone of rural land management, yet it passes almost unnoticed today. A lime kiln was essentially a stone-lined furnace, usually built into a hillside or bank to aid loading, in which limestone was burned at high temperatures to produce quicklime. That quicklime was then spread across acidic boggy soils to improve fertility, a practice that transformed marginal land into workable ground across Ireland from the seventeenth century onward.

The production of lime was a labour-intensive business. Farmers or landowners would gather limestone, often quarried locally, and layer it with fuel, typically turf or coal, inside the kiln's bowl-shaped interior. The burn could last several days, and the resulting quicklime had to be handled carefully, as it reacted violently with water and could cause serious burns. The spread of lime kilns across Connacht reflected both the improvement agriculture movement of the eighteenth and nineteenth centuries and the particular challenges of farming in the west of Ireland, where thin, wet soils made cultivation difficult without amendment. Many kilns were built communally and shared among neighbouring farms, making them as much a social feature of the landscape as a practical one.