The logistics of transporting tonnes of raw materials to port from mining sites in remote parts of Guinea has been a major hurdle for prospective developers of the country's vast mineral wealth.

London-listed Vast Resources will join new entrants like Russia's Alrosa as well as unlisted Chinese firm Anjin Investments.

A blockchain and an ethical sourcing platform are working to verify the origin of minerals used in tech.

Skorpion expected to produce around 90,000 tonnes of zinc last year.

The roaster, which the company says is a crucial part of its sulfide processing circuit at the gold mine, was taken offline due to a crack in the main external shell.

Vedanta has been locked in a dispute with the Zambian government since May.