By the time it was examined, centuries of ploughing had broken it into three separate sections, the largest of which measured just 2.2 metres by 1.9 metres and barely 0.1 metres deep, a modest remnant of what was once a more substantial deposit of dark, loosely compacted silty sand loaded with charcoal and burnt stone.

The site came to light in 2006 during excavations carried out ahead of the M8/N8 Cullahill to Cashel Road Improvement Scheme, under licence E2394. Burnt mounds of this kind are closely related to fulachta fia, a term used in Irish archaeology for ancient cooking or processing sites, typically consisting of a horseshoe-shaped mound of shattered, fire-heated stone accumulated beside a trough or pit where water was boiled by dropping the stones in. The Glashare mound is not itself classified as a fulacht fia, but two recognised examples of exactly that type lie roughly fifty metres to the north-east, suggesting this small area of south Kilkenny was the scene of repeated, purposeful activity, possibly over a long span of prehistoric time. Whether the three sites were used simultaneously, or represent different episodes of occupation separated by generations, is something the archaeology alone cannot settle.