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Warning follows mining group becoming latest to fall foul of export restrictions
Group halts operations in Tanzania after authorities blocked shipment
London-listed miner in dispute with local government over gem value
BlueRock’s Waugh seeks to profit from mine tailings
Groups led by De Beers grapple with challenge of young adults eschewing marriage
Pledge to cut capital expenditure must be followed through
Miner will stop trying to maximise volumes as sector battles to recover
International Edition