The =tungsten= industry is active; 900 tons have been mined in one year, about one-seventh of the world production. Exploitation of marble, wolfram, and mica in Córdoba and San Luis is showing good results. =Manganese= is exported in increasing quantity chiefly from the desert section of Santiago del Estero. Large =saline= deposits exist, some in basins with no outlet, in the central Provinces, some of volcanic type on the Puna of Atacama, others near the ocean not far from Bahia Blanca. Some of them have been exploited. Importation of salt has diminished and home production is expected shortly to suffice for local needs. =Petroleum= is now exciting the greatest interest. Oil is known to exist in four regions with others reported, but only one has been thoroughly tested, that at Comodoro Rivadavia. Borings carried on here by the Government struck oil at a depth of about 1800 feet in 1907. In 1910, 12,000 acres were reserved for Government exploitation which has since been carried on. The place is near the coast about 850 miles south of Buenos Aires. Development has been rather slow, but in 1916, 25 wells had been sunk and 21 were in active production of about 14 tons each per day. There were four steel tanks and other storage space, in all about 26,000 cubic meters, one such of this oil equalling .93 metric ton. In 1917, 36 wells were in production and 19 being bored. In 1918 about 1,250,000 barrels were produced. Tank steamers are provided, and storage tanks in Buenos Aires. An oil tank is begun in Rosario. Others are to be constructed in Buenos Aires, Bahia Blanca, Puerto Militar, Santa Fé, and Mar del Plata. The oil is heavy with an asphalt base; distilled, it yields 1.5-3.5 per cent of naphtha and gasoline, 15-19 per cent of illuminating oils, and 77-85 per cent of lubricating oils, fuel, and coke. Heavier than the better grades of United States oil, it has been used almost entirely as fuel, though it is said that it will distil readily. This will undoubtedly be its chief usefulness, to serve instead of coal. It is employed by a number of factories. A new Government well, 1921, was producing 34,000 barrels a day, and prospects are of the best. Millions have been appropriated for tank steamers, machinery, and for intensive development of the oil fields. The price rose from about $10 a ton in 1916 to $40 in December, 1917. Government control will probably continue, especially because the oil is likely to be used by the navy. A few private companies are operating outside the restricted area, using 12-inch tubes, while the Government has used smaller. One Company with a capital of $2,000,000 has with other equipment 4.3 miles of railway connecting with the Government railway to the port, also two miles of pipe line. Many of the _frigorificos_ use oil, mostly Mexican. The West India Oil Company imports from the United States or Mexico, mainly for refining.