|
| TABLE 3 | ||||||||
| CRUDE IRON ORE MINED IN THE UNITED STATES IN 2006, BY DISTRICT, | ||||||||
| STATE, AND MINING METHOD1, 2 | ||||||||
| Open pit | Underground | Total | ||||||
| Number | (thousand | (thousand | (thousand | |||||
| District and State | of mines | metric tons) | metric tons) | metric tons) | ||||
| Lake Superior: | ||||||||
| Michigan | 2 | 32,500 | -- | 32,500 | ||||
| Minnesota | 6 | 137,000 | -- | 137,000 | ||||
| Total | 8 | 169,000 | -- | 169,000 | ||||
| Other States | 4 | 9 | -- | 2 | ||||
| Grand total� | 12 | 169,000 | -- | 169,000 | ||||
| -- Zero. | ||||||||
| 1Includes some byproduct ore. Excludes ore containing 5% or more managanese. | ||||||||
| 2Data are rounded to no more than three significant digits; may not add to totals shown. | ||||||||
Source: United States Geological Survey Mineral Resources Program