=Vanadium= is found near Cerro de Pasco, the property of Americans. From 70 to 80 per cent of the world’s supply is believed to be in Peru, the second largest stock in Colorado. It is of great value for certain purposes in steel construction. The Peruvian ore, roasted before shipping, contains 25 per cent of vanadium. Three thousand five hundred tons were exported in 1918. =Quicksilver.= In the old mines of Huancavelica there is resumption of work through the activity of Señor Fernandini, a prominent Peruvian mine owner who has a smelter near that of Cerro de Pasco. He has been clearing out old tunnels, and driving new ones across, to cut the ores 700 feet below the old surface workings. A hydro-electric plant is on trial for the furnaces. The mines are high on the mountain above the town Huancavelica. The ore is a bright red cinnabar, mercury sulphide, impregnating clean sandstone uniformly, or along planes or fractures. =Other minerals= exported are tungsten, in 1917 1500 tons with a 60 per cent basis; a deposit at Yauli gives 14 per cent zinc with silver; a large borax lake near the city of Arequipa is likely soon to be developed; salt, a government monopoly, is found in many places but mainly worked in the _salinas_ of Huacho near Lima. Bismuth, molybdenum, and antimony are found. =Petroleum= is a very important product of Peru, the total area of oil territory being 5000 square miles, not all proved but with possibilities. The chief field is in Tumbes and Piura in the north, the Titicaca so far having made slight production. The latter field is 300 miles from the sea and eight from Lake Titicaca, near the Bolivian frontier and extending toward Cuzco. Deposits have been found in several provinces but the chief work was not far from the Juliaca station where 10 wells were sunk, in 1912 producing an average of 50 barrels a day, the oil with the paraffin base. At last accounts the work had been discontinued. In 1915 there were 524 wells in the country. The field at the north extends 180 miles south from the town of Tumbes to some distance beyond Paita, running east to the mountains and perhaps including the Islands of Lobos. The field is 30 miles wide, though some believe it may extend 150 miles. Here is practically no rain, no vegetation, and no water, except that of the sea which is used for all purposes. The temperature is called ideal. The wells range from 250 to over 3000 feet deep. At the north there is a slight plateau 160-500 feet high, running down towards the south. The Zorritos field farthest north and the oldest in Peru is 24 miles south of Tumbes, with wells four miles along the coast, drilled mostly at the water’s edge and some in the ocean. The deepest is 3000 feet but most are 600-2000 feet. Some wells produce 500-600 barrels a day, but one third of those dug were failures.