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| TABLE 2 | ||||||||||||||||||
| EMPLOYMENT AT IRON ORE MINES AND BENEFICIATING PLANTS, QUANTITY AND TENOR OF ORE PRODUCED, AND AVERAGE | ||||||||||||||||||
| OUTPUT PER WORKER HOUR IN THE UNITED STATES IN 2006, BY DISTRICT AND STATE1 | ||||||||||||||||||
| Production | ||||||||||||||||||
| Iron contained | Iron | Average quantity per worker hour | ||||||||||||||||
| Average | Crude ore | Usable ore | (in usable ore) | content | (metric tons) | |||||||||||||
| number of | Worker hours | (thousand | (thousand | (thousand | natural | Iron | ||||||||||||
| District and State | employees | (thousands) | metric tons) | metric tons) | metric tons) | (percent) | Crude ore | Usable ore | contained | |||||||||
| Lake Superior: | ||||||||||||||||||
| Michigan2 | 1,220 | 2,560 | 32,500 | 11,900 | 7,210 | 60.4 | 12.69 | 4.66 | 2.82 | |||||||||
| Minnesota | 3,230 | 6,260 | 137,000 | 40,800 | 26,100 | 63.9 | 21.85 | 6.52 | 4.16 | |||||||||
| Total or average | 4,450 | 8,820 | 169,000 | 52,700 | 33,300 | 63.1 | 19.20 | 5.98 | 3.77 | |||||||||
| Other States3 | 20 | 39 | 9 | 9 | 5 | 54.0 | 0.24 | 0.24 | 0.13 | |||||||||
| Grand total or average | 4,470 | 8,860 | 169,000 | 52,700 | 33,300 | 63.1 | 19.11 | 5.95 | 3.76 | |||||||||
| 1Data are rounded to no more than three significant digits, except "Average per worker hour, crude ore" and "Average per worker hour, usable ore;" may not | ||||||||||||||||||
| add to totals shown. | ||||||||||||||||||
| 2Does not include professional or clerical workers at mines, pelletizing plants, maintenance shops, or research lab workers. | ||||||||||||||||||
| 3Includes California and South Dakota. | ||||||||||||||||||
Source: United States Geological Survey Mineral Resources Program