Largest width? Largest depth? Largest production? Largest reserves?
There are a couple of different ways you could define “largest”–by area? Depth? Amount produced?–but the Argyle mine in Kimberley in western Australia is the largest single producer of diamonds. It was opened in 1985 and a recent investment will extend the life of the mine to at least 2019. The mine is an open-pit style with rock being blasted away and then loaded onto trucks and removed. Since its opening, the mine has produced over 670Mct of diamonds.
There is a diamond mine in Mirny, a town in siberia, that is so large, the sky above it is a no fly zone for helicopters, as the downward airflow causes them to be sucked downward and crash. It is the second largest man-made hole in the world, the largest being a Bingham Copper Mine in Utah. It is currently 1,772 ft (525m) deep and 3,900 ft (1.25km) wide, and excavation has continued since 1955. Picture from the second link.
Bingham Canyon is not the largest open pit in the world; there are two mines in Chile that are larger.
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