The coup exacerbated concerns about supply constraints that have pushed aluminum prices to the highest level in 13 years.

Guinea is China's biggest supplier of bauxite.

The political upheaval catches the aluminum raw materials chain at a vulnerable moment with alumina prices already surging higher due to refinery problems.

Aluminum climbed to the highest in more than a decade after a coup in Guinea fueled concerns over raw material supplies.

Chalco produces bauxite, the main aluminium ore, from the Boffa mine.

Guinea is a key global supplier of bauxite, an ore that’s processed into alumina and then aluminum.

Rising bauxite output from Australia and Guinea to push market to pre-covid levels.

Annual top-ten list of the largest US-based mining companies ranked by market capitalization