Table 3.--Historical tungsten concentrate price statistics (U.S. dollars per metric ton unit WO3)1/ ------------------------------------------------------------------------------------------------------------------------ 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 ------------------------------------------------------------------------------------------------------------------------ Metal Bulletin (London): Wolframite2/----------------------- 83.74 53.67 43.64 48.74 92.52 91.70 114.29 170.89 143.77 138.84 144.48 Scheelite3/------------------------ -- -- -- -- -- -- -- -- -- -- -- International Tungsten Indicator4/--- -- -- 47.58 48.87 94.50 91.11 103.84 158.87 142.94 139.00 142.64 Metals Week5/------------------------ -- -- -- -- -- -- -- 164.08 141.31 140.34 143.16 U.S. mine shipments6/---------------- 44.67 51.69 44.94 47.44 83.48 92.65 111.00 159.87 143.62 146.75 146.49 ----------------------------------------------------------------------------------- 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 -------------------------------------------------------------------------- Metal Bulletin (London): Wolframite2/----------------------- 143.58 106.12 80.67 81.28 67.61 47.54 49.00 55.94 56.57 46.42 Scheelite3/------------------------ -- -- -- 92.27 74.03 55.16 57.15 60.65 65.10 62.61 International Tungsten Indicator4/--- 143.48 113.19 80.19 82.75 73.10 55.56 51.36 58.78 60.79 54.27 Metals Week5/------------------------ 142.37 107.32 84.93 85.08 68.00 46.46 50.34 59.46 53.69 41.87 U.S. mine shipments6/---------------- 139.21 111.06 82.17 90.63 73.77 56.04 NA W W W ------------------------------------------------------------------------------------------------------------------------ NA Not available. W Withheld to avoid disclosing company proprietary data. 1/Annual average. A metric ton unit contains 7.93 kilograms (17.48 pounds) of tungsten. 2/European market, 65% WO3 basis. 3/European market, 70% WO3 basis. 4/Weighted average, 60% to 79% WO3 basis. International Tungsten Indicator was called Tungsten Users Index from Apr. 1972 through June 1978. 5/U.S. spot quotations, 65% WO3 basis, c.i.f. U.S. ports. Reporting began in 1977. 6/Reported value, f.o.b. mine.