Iron ores, salt and sandstones . Plate IX.—A.—The Old Tunnels at the Dan Mine, Beaver LickMountain, Pocahontas Plate IX. -B.—Hanging Wall at the Dan Mine, Beaver LickMountain, Pocahontas County. WEST VIRGINIA GEOLOGICAL SURVEY. 285 eluding one large panic and two small ones, might be takenas representing average future conditions. The rate of in-crease in iron ore production during this period was cent per annum, or per cent per decade. If theincrease in iron ore production be taken at 100 per cent perdecade, Dr. Kent estimates the future annual production asfollows:
Iron ores, salt and sandstones . Plate IX.—A.—The Old Tunnels at the Dan Mine, Beaver LickMountain, Pocahontas Plate IX. -B.—Hanging Wall at the Dan Mine, Beaver LickMountain, Pocahontas County. WEST VIRGINIA GEOLOGICAL SURVEY. 285 eluding one large panic and two small ones, might be takenas representing average future conditions. The rate of in-crease in iron ore production during this period was cent per annum, or per cent per decade. If theincrease in iron ore production be taken at 100 per cent perdecade, Dr. Kent estimates the future annual production asfollows: 1910 33,000,000 tons 1920 66,000,000 1930 132,000,000 1940 264,000,000 1950 528,000,000 PART II. Salt in West Virginia. CHAPTER XL THE DISTRIBUTION AND ORIGIN OF SALT. Common salt or sodium chloride (Na CI) is one of thevery common and also most important minerals, forming oneof the necessities of life. When theoretically pure, commonsalt contains per cent of sodium and per centchlorine. It occurs in solid form as rock salt with a hard-ness of and a gravity of 2 to ; and also in form of saltbr
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