It never appeared on Ordnance Survey Ireland's historic maps, meaning it was absent from the documentary record that most archaeologists and local historians would consult. Its existence only became formally recognised when an aerial photographic survey, carried out over the Bruff area in 1986, caught a tell-tale circular cropmark in the pasture below. Cropmarks of this kind appear when buried features such as ditches or banks affect how vegetation grows above them, with the soil conditions over an ancient structure causing grass or grain to grow differently from the surrounding field, making the shape visible from the air even when nothing is apparent at ground level.

A ring barrow is a burial monument, typically consisting of a low central mound enclosed by a circular ditch and sometimes an outer bank, dating in Irish contexts generally to the Bronze Age or early medieval period. The Kilduff example sits on a south-east-facing slope in improved pasture, roughly 25 metres north-east of the townland boundary with Pallas. What makes its position all the more intriguing is the company it keeps. A cluster of three further ring barrows lies just 45 metres to the north-east, recorded separately as LI024-249, LI024-250, and LI024-251, suggesting this part of Kilduff was once a focus of repeated or sustained funerary activity. Roughly 75 metres in the same direction lies Keating's Well, a named holy well whose proximity to the barrow group may or may not be coincidental. The aerial survey reference for this site is Bruff 158.1, AP 4/3678, from the 1986 survey.

Because the monument was absent from historic mapping, it lacks the kind of long paper trail that draws casual visitors to better-documented sites. Its presence is confirmed through a sequence of satellite and aerial imagery: it appears on OSi orthoimages from the 2005 to 2012 period, on a Digital Globe image from 2011 to 2015, and on a Google Earth image captured on 18 November 2018. On the ground, the feature reads as a circular earthwork within ordinary grazing land, understated in the way that many Irish field monuments are. Visitors working from the coordinates should look for the slight rise and curvature in the pasture, and be aware that the nearby barrow cluster and Keating's Well are all within comfortable walking distance to the north-east, making this a compact but genuinely layered patch of landscape to read carefully.