Jamalco is a joint venture between Noble Group and Clarendon Alumina Production (CAP) with a focus on bauxite mining and alumina production. The company started as a bauxite mining venture by Alcoa in 1959 and exported its first shipment of bauxite in 1963. The company began alumina production at a new refinery in Halse Hall Clarendon in 1972 with a production capacity of 500,000 metric tonnes per year (mtpy), which it exported from its port facility at Rocky Point.
The refinery’s capacity was upgraded to 1 million mtpy in 1999 and then to1.25 million mtpy in 2003. The completion of a further upgrade in March 2007 lifted the production capacity of the refinery to 1.425 million metric tonnes per year.