Unlike the vertical waterwheel familiar from later industrial milling, the horizontal-wheeled mill, sometimes called a Norse or tub mill, operated on a much simpler principle: water was directed at a horizontal wheel mounted directly on a vertical shaft, which turned the millstone above without the need for gearing. This design was common across Ireland and Scotland from early medieval times well into the nineteenth century, and its very simplicity made it well suited to small rural communities where a modest stream and a local grain crop were all that was needed to justify its construction. Finding one recorded at Ballingarden places Mayo within a broader tradition of small-scale milling that once dotted the townlands of the west.

Horizontal mills of this type are often all but invisible above ground. What typically survives is the millrace, the channel cut to direct water onto the wheel, along with stone-built sluice features or the outline of the mill building itself, sometimes reduced to little more than a scatter of worked stone. Without more detailed survey information available for this particular site, the precise condition and extent of what remains at Ballingarden is unclear, but its classification as a recorded monument means it has been identified as a feature of archaeological significance worth preserving and investigating further.