Lime kilns were once a common feature of the Irish countryside, used to burn limestone at high temperatures to produce quicklime, which farmers then spread across acidic soils to improve fertility. They also supplied lime for mortar in local building work. That one exists on an island is a small detail worth pausing over, since the logistics of island farming, the sourcing of fuel and raw stone, and the effort of maintaining such an operation in a coastal environment, add a layer of particularity to what might otherwise seem an unremarkable piece of industrial vernacular.

Lime kilns of this type were built and used across Ireland roughly from the seventeenth century through to the late nineteenth and early twentieth centuries, when cheaper agricultural lime became available through commercial supply chains. The typical design is a stone-built bowl or draw kiln set into a hillside or bank, allowing fuel and limestone to be loaded from above and the burnt lime to be raked out from a lower arch. Many thousands were constructed, often by tenant farmers or landlords improving their estates, and a significant number survive in varying states of decay across the island. The example at An Inse Mhór is recorded as a monument, which places it within the longer arc of Cork's island archaeology, a landscape where human occupation has left marks ranging from early ecclesiastical remains to post-medieval agricultural features such as this.