The revision follows a fall in reserves and resources at the miner's Yanfolila mine, where estimates dropped 18% and 17%, respectively.

CEO Mark Bristow said the copper increase plus its gold production was to boost total production to 6.8 million gold equivalent oz. by that date.

The government of Botswana said in March that it had agreed to buy a 24% stake in the diamond processor and trader.

LCM is currently the only rare earth metal and alloy manufacturing facility in the UK.

A state-backed Saudi venture would buy stakes in mining assets worth $15 billion in African countries, which will permit US companies to buy some of the production.

The granite quarry is owned by Chinese company Omni Quarries.

Biofuel adoption is aimed at reducing emissions in the transportation and industrial sectors.

The Swiss miner will pay a staggered $5 million to Tantalex as part of the marketing off-take agreement.