Surface Iron Ore Mines, in Thousand Long Tons, 1988 ..... 113 Table 14. Beneficiation Methods Commonly Associated With Iron Ores and the Percentage of Ore Treated by Each Method, 1990 ..... 115 Table 15. Water Usage of Selected Iron Ore Operations and the Sources of the Water Used ..... 115 Table 16. Reagents Commonly Used In Iron Ore .