KOBU, Congo, the Democratic Republic of the
To match feature CONGO-DEMOCRATIC/BUSINESS
Gold miners form a human chain while digging an open pit at the Chudja mine in the Kilomoto concession near the village of Kobu, 100 km (62 miles) from Bunia in north-eastern Congo, in this February 23, 2009 file photo. Home to the world's biggest reserves of cobalt -- used in batteries, ceramics and dyes -- Congo has gold, silver and diamond mines, and holds some of the world's largest stores of copper, tin and metals such as tungsten, a component of many mobile phones. To match feature CONGO-DEMOCRATIC/ REUTERS/Finbarr O'Reilly/Files (DEMOCRATIC REPUBLIC OF CONGO - Tags: BUSINESS ENVIRONMENT)