The next three to six months will be crucial to the future of the vast copper-gold mine, as the companies behind the operation negotiate with the government.

The unbroken white diamond, recovered from the Karowe mine in Botswana, could fetch more than $10 million.

Modular plant could initially supply 20% of global market for the critical mineral.

Output at the Pueblo Viejo gold mine rose 23% to 159,000 ounces of gold.