On a headland in County Waterford called Dane's Island, roughly thirteen mine-openings punctuate the ground beneath a promontory fort, the kind of clifftop enclosure defined by its dramatic coastal position rather than any surrounding wall. The mines themselves are the puzzle. They sit there visibly enough, yet nobody can quite agree on what was being extracted, or when.

The debate runs to a considerable span of human history. Jackson, writing in 1979, identified the workings as Bronze Age copper mines, placing them among the earliest evidence of metal extraction in Ireland, a period when copper was alloyed with tin to produce the tools and ornaments that define the era archaeologically. Cowman, however, revisited the question in 1982 and argued on historical grounds for a far more recent origin: eighteenth-century operations targeting silver and lead. The two interpretations are not merely different answers to the same question; they describe entirely different economies and entirely different people. Bronze Age miners would have been working with stone and bone tools in a landscape without written records. Eighteenth-century miners would have been part of a documented, commercially driven industry, the kind that left leases, shareholders, and correspondence behind. That historical paper trail, or its absence, is presumably what Cowman found persuasive, though the physical evidence on the headland has not settled the matter.

The site is recorded as inaccessible, so the mines remain something to know about rather than visit. They sit beneath a promontory fort on a Waterford headland, unresolved, with Bronze Age prehistory and Georgian industry still competing to claim them.