They are not the remnants of a grain mill or a flour operation, but of something considerably stranger to the modern eye: a nineteenth-century facility for processing barytes and umber, two minerals that belong firmly to the industrial and commercial world rather than the agricultural one most people associate with rural West Cork.

Barytes, a dense sulphate of barium, was mined across parts of Cork and was valued in the nineteenth century for uses ranging from paint manufacture to the weighting of paper and textiles. Umber is an iron and manganese oxide pigment, used since antiquity as a brown or reddish-brown colourant. That both were being processed together at this harbour-side site points to a small but purposeful industrial enterprise, grinding and preparing raw minerals for onward shipment. The Ordnance Survey six-inch map of 1901 labels the complex plainly as a Barytes and Umber mill, which suggests it was still a recognised feature of the landscape at that point, even if working days may already have been behind it. The dilapidated quay alongside the two structures would have allowed processed material to be loaded directly onto boats, a practical arrangement on a harbour as sheltered and accessible as Schull's.

What survives today is fragmentary but legible. The base of a chimney remains on the southern elevation of the northern building, a trace of whatever heat or engine power the milling process required. The nine millstones, varying in type, are the most visually arresting element, lying about the site as though simply set down and forgotten when the work stopped.