Cecilia Jamasmie , Senior Editor

The $400 million-deal will make of Trevali the first pure zinc company with operations in North and South America as well as Africa.

Takeover brings together two of the UK's largest energy services companies.

Disputes at BHP Billiton’s Escondida mine in Chile, the world's biggest copper mine, and Freeport’s Grasberg and Cerro Verde mines, are also having a significant effect on global supplies of concentrate.

The rectangular, 25.27-carat gem is one of a collection of 13 polished diamonds cut from the famous 726-carat Jonker rough, unearthed at South Africa’s Elandsfontein mine in 1934.

The Kvanefjeld project would also be the world’s second-biggest rare earths operation.

The mine produced just under 500,000 tonnes of the red metal last year, making it Peru's largest copper operation.

Once the deals close, there will be only three major companies — CNRL, Suncor and ExxonMobil majority-owned Imperial Oil Ltd. — dominating Canada's oil sands industry.

The country expects mining investments to increase 360% in the next four years compared to the 2013-2016 period as it has already granted 160 of the 420 explorations licences it put out to tender in July.

The 187.6-carat rare stone will remain on display until April at the Smithsonian’s National Museum of Natural History in Washington D.C..

Beijing will adopt more market-friendly measures in the sector and other oversupplied industries.