Ernest Henry was born in England in 1837 and became an explorer, prospector, and grazier of the kind the colonial frontier produced in abundance: restless, ambitious, and willing to ride into country that mapmakers had barely touched. His 1867 copper discovery on the Cloncurry River, made with the help of a companion and Aboriginal guides who knew the land, opened the region to mining. He is often called the father of Cloncurry. He went on to find more copper at Argylla and Mount Oxide before dying in 1919. The frontier he opened, however, was already home to people who had lived there for tens of thousands of years.

The mineral wealth that made Ernest Henry's name lay in the country of the Mitakoodi people, who belonged to the Cloncurry district, with the Kalkadoon to the south and west around Mount Isa. The arrival of miners and pastoralists in the late nineteenth century brought brutal frontier conflict. The Kalkadoon in particular fought a determined resistance against the newcomers and suffered terribly for it, in violence now remembered in the region's history and memorials. The copper that built the towns was won from land taken from people who never ceded it - a truth that sits beneath every shaft and headframe in the district, including the one that bears the prospector's name.

The modern Ernest Henry deposit is a geological oddity worth marvelling at. It is an iron-oxide copper-gold body, a pipe-like mass of mineralised rock plunging steeply into the earth, formed by superheated fluids surging through the crust more than a billion years ago. Within it, copper-bearing chalcopyrite is bound up with magnetite, the strongly magnetic iron mineral, alongside gold and silver. That magnetism is exactly what betrayed the buried ore to geophysical surveys in the mid-1990s. The mine doesn't just yield copper and gold; the magnetite itself is sold as a product, so the same rock that hid the treasure also pays its own way to the surface.

Commercial mining began here in 1998 as an open cut, a widening spiral carved down into the deposit. When the open pit reached its economic limit, the operation went underground in 2011, switching to a method called sub-level caving, where the rock is undercut and allowed to collapse in a controlled way so it can be drawn off from below. Today a shaft about 1,000 metres deep hoists the ore to the surface, where grinding and flotation separate out the copper and gold. The concentrate travels to Glencore's smelter at Mount Isa and on to the refinery at Townsville. In March 2023, floodwater poured into the workings and shut the mine for six weeks - a reminder that the dry Gulf country can turn, suddenly, to water.

The mine's story is far from over. Now owned by Evolution Mining, Ernest Henry has had its life extended toward 2040, driven by a hunger for copper that the old prospectors could never have imagined. The metal that once went into telegraph wire and roofing now feeds electric motors, wind turbines, and the grids of a decarbonising world, and demand keeps climbing. So the green-and-blue stone that Ernest Henry knocked off an outcrop in 1867 has come full circle: the same copper, dug from the same district, now powering machines a Victorian prospector could not have dreamed of - the past quietly wiring the future.