The Smelting House ruins on Kawau Island, New Zealand, belong to the copper mine established in 1844.

The Auckland architect Walter Robertson designed a simple building completely built of Waitematā sandstone.

The smelter was no longer functioning in September 1855, and shortly after that, the mine closed altogether.

[1] Guarded by just six wardens, they escaped in September 1864 and eventually returned to the Waikato.

[3] Media related to Smelting House ruins at Wikimedia Commons