The mound is what archaeologists call a fulacht fia, a type of Bronze Age cooking site found in extraordinary numbers across Ireland, particularly in low-lying, waterlogged ground near water sources. The characteristic shape comes from the gradual accumulation of fire-cracked stone, discarded after repeated heating and plunging into a water-filled trough. Over centuries of use, the rejected stone builds up in a distinctive curved ridge around the trough, which is itself usually no longer visible at the surface.

Fulachtaí fia are among the most common prehistoric monuments in Ireland, yet individual examples like this one at Knockanevin rarely attract much attention. The site conforms closely to the typical pattern: proximity to a stream, low ground that would have retained moisture, and the telltale burnt mound material that gives these sites their recognisable profile in the field. The exact date of use at Knockanevin is not recorded, but as a class, fulachtaí fia cluster mainly in the Bronze Age, roughly 2000 to 500 BC, with some evidence of use extending into later periods. The purpose has been debated at length by archaeologists; cooking remains the most widely accepted explanation, though experimental work has shown the same technology would have served equally well for textile processing or preparing hides.