The De Beers Group of Companies has a leading role in the diamond exploration, diamond mining, diamond retail, diamond trading and industrial diamond manufacturing sectors. The company is currently active in open-pit, large-scale alluvial, coastal and deep sea mining. The company operates in 28 countries and mining takes place in Botswana, Namibia, South Africa and Canada. Until the start of the 21st century, De Beers effectively had total control over the diamond market as both a monopoly and monopsony of diamonds. Opposition has since dismantled the complete monopoly, though De Beers is still a large shareholder and currently sells approximately 35% of the world’s rough diamond production through its Global Sightholder Sales and Auction Sales businesses.