Burnt mounds are accumulations of fire-cracked stone and charcoal-rich soil, almost certainly the byproduct of repeatedly heating stones and plunging them into water, most likely for cooking, bathing, or industrial processes. They are found in their thousands across Ireland, typically dating to the Bronze Age, and their very ordinariness makes them archaeologically compelling: they represent the routine, unglamorous work of daily life rather than the ceremonial or the monumental.

Excavation at the Camlin site revealed four such deposits, three of which had been identified during earlier testing and a fourth uncovered once stripping of the ground surface began. One mound that had initially appeared to be a burnt deposit proved, on closer examination, to be natural blackened soils, a reminder of how readily geology can mimic archaeology. The clearest surviving feature, designated BM3, survives as a spread roughly seven metres in diameter and around twenty centimetres high, modest in height but substantial in extent. Close to this deposit, excavators identified two large, notably circular pits, their regularity suggesting they may have functioned as wells rather than as simple quarry scoops or storage features, a detail that, if confirmed, would fit the pattern of burnt mounds often being associated with a nearby water source.