The Compagnie minière de l'Ogooué, or COMILOG, is a manganese mining and processing company based in Moanda, Gabon.It is a subsidiary of the French metallurgical group Eramet. The company is the world's second largest producer of manganese ore.At first the ore was carried by a cableway to the border with the Republic of the Congo, then by rail to the sea at Pointe-Noire.In the 1980s a railway was built to carry the ore through Gabon to the sea near Libreville.