San Ciprian lies in the extreme northwest Atlantic coast of the Spanish state of Galicia. The production plants of aluminium oxide and aluminium in San Ciprián comprise the largest industrial complex of Alcoa in Spain and have been the principal economic and social engine of La Mariña (Lugo) since these were inaugurated by the King of Spain 20 years ago.

Currently, the center directly employs 1,500 people and generates 600 more jobs in subsidiary businesses, not counting the services and the entire economic and social framework that it generates in the surrounding area. San Ciprián has one of the highest per capita incomes of Galicia.

The refinery complex produces 1,400,000 metric tons of aluminium oxide and 250,000 metric tons of primary aluminium as ingots for casting, billets for extrusion and sheets for lamination. Of the total aluminium oxide capacity approximately 400,000 mt are dedicated to chemical (non-metallurgical) applications. This tonnage is split almost 50:50 between aluminium oxide and aluminium hydroxide, also referred to as hydrated alumina.

The production of aluminium oxide is used for the production of primary aluminium and aluminium oxides for the ceramics and chemicals sectors, while the production of primary aluminium is basically supplied to Alcoa plants of intermediate products in Spain and in other European countries, as well as to other clients mainly from Europe and Asia.

The port stands out from the common installations of the industrial complex. Ninety-two percent (92%) of the merchandise for import and export pass through Alcoa’s port in San Ciprián, which is the second in Galicia for volume of merchandise.

San Ciprian, Spain


ISO 14001
ISO 9002 (precipitation plant)


Aluminium hydroxides
Aluminium oxides