Table 6.--Employment1/ at iron mines and beneficiating plants, quantity and tenor of ore produced, and average output per worker hour in the United States ----------------------------------------------------------------------------------------------------------------------- Production Average per worker hour Employment2/ Total (thousand metric tons) (metric tons) Year ------------------------------------- worker ----------------------------- --------------------------- Minnesota Michigan3/ Other Total hours Crude Usable Iron Crude Usable Iron U.S. (thousands) ore ore4/ contained ore ore4/ contained ----------------------------------------------------------------------------------------------------------------------- 1965------- 9,689 3,957 7,127 20,773 46,403 180,796 88,024 50,174 3.90 1.90 1.08 1966------- 9,871 3,615 6,855 20,341 46,448 186,147 90,790 52,437 4.01 1.95 1.13 1967------- 9,300 3,400 6,100 18,800 43,891 186,340 84,745 49,212 4.25 1.93 1.12 1968------- 9,000 3,400 6,100 18,469 44,459 199,526 86,503 50,689 4.49 1.95 1.14 1969------- 8,700 3,700 6,300 18,646 42,634 209,987 89,005 53,644 4.93 2.09 1.26 1970------- 8,500 2,600 5,900 17,000 43,579 215,869 90,352 53,678 4.95 2.07 1.23 1971------- 8,200 2,500 5,200 15,900 39,385 199,549 81,332 48,973 5.07 2.07 1.24 1972------- 7,600 2,500 4,400 14,500 35,587 190,659 76,330 46,382 5.36 2.14 1.30 1973------- 11,210 3,352 5,040 19,602 38,335 222,167 88,778 54,092 5.80 2.32 1.41 1974------- e/11,000 e/4,000 e/5,000 e/20,000 39,118 220,700 85,209 51,642 5.64 2.18 1.32 1975------- 11,190 3,909 4,819 19,918 39,113 217,964 79,636 48,750 5.57 2.04 1.25 1976------- 11,721 4,188 4,547 20,456 39,173 227,659 80,554 49,698 5.81 2.06 1.27 1977------- 11,289 4,468 4,405 20,162 30,385 160,924 56,119 34,709 5.30 1.85 1.14 1978------- 13,294 4,732 2,922 20,948 39,664 238,190 82,437 51,290 6.01 2.08 1.03 1979------- 13,915 4,734 3,000 21,649 40,030 259,928 86,777 54,299 6.49 2.17 1.36 1980------- 11,716 3,886 2,630 18,232 34,090 215,464 70,730 44,592 6.32 2.07 1.31 1981------- 12,189 3,868 2,103 18,160 34,349 230,644 74,348 47,286 6.71 2.16 1.38 1982------- 6,049 1,752 1,429 9,230 17,246 111,619 36,002 23,004 6.47 2.09 1.33 1983------- 5,085 1,795 687 7,567 14,235 117,388 38,165 24,555 8.25 2.68 1.72 1984------- 5,713 2,129 373 8,215 16,704 161,610 52,092 33,641 9.67 3.12 2.01 1985------- 5,780 2,083 315 8,178 14,042 151,606 49,533 31,798 10.80 3.53 2.26 1986------- 4,100 1,716 232 6,048 11,477 121,887 39,486 25,298 10.62 3.44 2.20 1987------- 3,737 1,834 210 5,781 11,667 148,104 47,648 30,526 12.69 4.08 2.62 1988------- 4,706 2,090 210 7,006 14,229 183,166 57,515 36,468 12.87 4.04 2.56 1989------- 5,245 2,205 278 7,728 15,719 187,806 59,032 37,413 11.95 3.76 2.38 1990------- 5,577 1,701 314 7,592 15,712 181,442 56,408 35,695 11.55 3.59 2.27 ----------------------------------------------------------------------------------------------------------------------- e/Estimated. 1/Mining Enforcement and Safety Administration (MESA) provided 1973-77 data. Mine Safety and Health Administration (MSHA) provided 1978-90 data. 2/Employment data for 1967-72 are calculated from data provided in the U.S. Bureau of Mines Minerals Yearbook. "Total U.S." employment data for 1968 and 1969 are exact figures, but exact data for individual states are not available. 3/Includes workers in Wisconsin for years prior to 1984. 4/Byproduct ore included after 1979.