William 'Bill' Marmion, Western Australia's minister for mines and... News PhotoAsia,Australasia,Australia,Ceremony,Delivering,Diamond - Gemstone,Finance,Gemstone,Government Minister,Growth,Kununurra,Man Made Object,Mine,Miner,Mining,Oceania,Oil Industry,Opening Ceremony,Precious Gemstone,Rio Tinto Group,Talking,Traditionally Australian,Vertical,Western AustraliaPhotographer Collection: Bloomberg 2013 BloombergWilliam 'Bill' Marmion, Western Australia's minister for mines and petroleum, speaks during the opening ceremony of Rio Tinto Group underground expansion of the Argyle diamond mine in Kimberley, Australia, on Tuesday, April 30, 2013. Production at Argyle, which supplies more than 90 percent of the world’s pink diamonds, will rise to 20 million carats annually as production moves underground, while costs will fall. Photographer: Ian Waldie/Bloomberg via Getty Images