Bingham Canyon Mine in Utah, the world’s biggest manmade pit.
This mammoth mine measures 4 km wide and drops a stomach-churning 1.2 km into the ground, the result of extraction begun in 1863. The ore-inspiring fruits of its labour include more than 17 million tonnes of copper and 715 tonnes of gold – a mental load of metal.
Now it employs 1,400 people and 50,000 tonnes of material are removed from it each day. What’s more, this giant earth scar and National Historic Landmark is growing – and will continue to until at least 2013.
John Bullas, photographer