=Antimony= also is found in large quantities. Nearly 18,000 tons were exported in 1916, worth approximately $5,000,000, but with high prices and abnormal demand due to the war. Less than one per cent of the quantity was exported in 1912. The ores are rich, often running 70 per cent pure metal. =Zinc= in the form of sulphides or blends is abundant, largely in connection with silver. Such ores are sent to Europe, there to be separated, the scarcity and almost prohibitive price of coal rendering such a course desirable for various products, to avoid the excessive cost of smelting; at the same time the high cost of transportation limits the export. =Wolfram=, an iron-manganese tungstate, is found near veins of tin and much is exported, the production being especially in the Santa Cruz district, at the northeast of Cochabamba. Some lodes contain no less than 50 per cent of tungstic acid, the ores concentrated for export running higher. About 7¹⁄₂ million pounds were exported in 1918 valued at nearly $3,708,000. =Coal.= The lack of good coal is the chief fault in nature’s economy in Bolivia. Its usual cost in La Paz is $40-$50 a ton, at times $75. It is therefore used as little as possible, although some is imported. While Bolivia has been said to possess no coal at all, a lignite of fair quality has been discovered in the peninsula of Copacabana, Lake Titicaca, some of which has been used by the Guaqui-La Paz Railway to develop electric power; but not in serious fashion, experimental merely. Other seams are found near the Ayoapó station, which a company has been organized to exploit. Good samples have come from Tacora on the Arica Railway near the frontier, the coal said to be equal to that of Coronel in Chile, the seams rich and thick. If so their exploitation will immensely advance the industries of the country. Good coal is reported across the mountains from Sorata and lignite is found near Cochabamba.