Cuba has considerable mineral wealth: nickel, cobalt, chromium, copper, tungsten, manganese, iron, gold, silver, zeolithe, calcium carbonate and silica sand. The oil that is currently being extracted is of very poor quality (heavy, viscous and heavily loaded with sulfur (between 10° and 20° API)), which very much limits its use at the moment. The Cuban industry concentrates, on the most part, to processing agricultural products, manufacturing machines for the agricultural sector and production of raw materials for the construction sector (cement, prefabricated buildings...).