The example at Caheronaun in County Galway is one such structure, a surviving fragment of an agricultural and building practice that shaped the landscape for centuries. A lime kiln was essentially a stone furnace, typically built into a hillside or bank, in which limestone was burned at high temperatures to produce quicklime. The resulting material was spread on fields to reduce soil acidity and improve fertility, or mixed with water and sand to make mortar for construction. In a county like Galway, where limestone underlies much of the terrain, the raw material was rarely far away.

The presence of a kiln at Caheronaun points to the kind of small-scale, localised industry that once operated quietly across townlands throughout Connacht. These structures were seldom built by large concerns; most were put up by landowners or tenant farmers to serve their own needs, occasionally shared among neighbours during the burning season. The work was labour-intensive and the fires had to be maintained continuously for days at a time, fed with alternating layers of fuel and stone. By the late nineteenth and early twentieth centuries, the arrival of commercially produced lime made many such kilns redundant, and they were gradually abandoned where they stood, left to weather into the surrounding ground.