Certain high-grade low-phosphorus iron ores which are not present in the United States in sufficient quantity to supply domestic needs have been imported in past years from Spain, North Africa, and to a small extent from Sweden. During the war, when the shortage of shipping facilities necessitated combing this country for supplies of high-grade low-phosphorus ores, it was shown that the United States is more or less dependent upon foreign sources for such ores. There are a number of mines in the United States, such as the Lyon Mountain mine in New York, and the Cranberry mine in North Carolina, which produce limited amounts of high-grade low-phosphorus ore. Several mines on the Menominee Range, Michigan, produce a very siliceous low-phosphorus ore that can be used to supplement in part the high-grade ores. A considerable quantity of low-phosphorus pyrite residue from sulphuric acid and fertilizer plants is also used for making low-phosphorus iron. Much of the pyrite yielding this residue is imported from Spain, some of it is of domestic origin, and some of it comes from Canada. Altogether, the United States supplies about 60 per cent. of the material required for the manufacture of its normal output of low-phosphorus pig iron. Certain developments in progress make it probable that a greater percentage of ore used for this purpose can be supplied from domestic mines. The principal enterprise is one that plans to concentrate the siliceous magnetite ore of the eastern Mesabi Range. Experiments have yielded a high-grade product and work on a commercial scale is planned. The reserves of the ordinary grades of iron ore in the United States are large, and no shortage of such ore is anticipated for many years. They are easily capable of taking care of a considerably increased consumption. The largest reserves are in the Lake Superior district and in the southeastern states, but large untouched reserves occur in the western states as well. The iron ores in the Pacific Coast region have remained undeveloped from the lack of sufficient demand for pig iron and crude forms of iron and steel on the Pacific Coast. Undoubtedly this demand will increase in the future, and iron and steel industries will be established there. The reserves of ore in the Lake Superior district are large. The grade of ore mined, however, has been gradually getting lower, and it is possible that before many years Lake iron ores averaging considerably below 50 per cent. will have to be utilized. At present the average grade of the ores mined in the Lake Superior district is about 51 per cent.