Commercial production at the tin mine, which is surrounded by dense forest, deeply weathered soils and experiences high rainfall, is expected in the second half of the year.
Union leader Joseph Mathunjwa has never hesitated to go head-to-head with powerful CEOs in South Africa's mining industry, but now he may have to face down the government.
Guinea expects to boost its energy production capacity by nearly four-fold over the next six years as it pushes mining companies to refine their bauxite output locally.