|
| TABLE 3 | ||||||||
| MINE PRODUCTION OF COPPER-BEARING ORES AND RECOVERABLE COPPER CONTENT | ||||||||
| OF ORES PRODUCED IN THE UNITED STATES, BY SOURCE AND TREATMENT PROCESS1 | ||||||||
| (Metric tons) | ||||||||
| 2004 | 2005 | |||||||
| Gross | �Recoverable | Gross | �Recoverable | |||||
| Source and treatment process | weight2 | copper | weight2 | copper | ||||
| Mined copper ore: | ||||||||
| Concentrated | 139,000,000 | 533,000 | 154,000,000 | 529,000 | ||||
| Leached | NA | 584,000 | NA | 554,000 | ||||
| Total | NA | 1,120,000 | NA | 1,080,000 | ||||
| Copper precipitates shipped, leached from | ||||||||
| tailings, dumps, and in-place material | 1,270 | 2,360 | 1,490 | 1,990 | ||||
| Other copper-bearing ores3 | 4,780,000 | 37,200 | 5,170,000 | 55,000 | ||||
| Grand total | XX | 1,160,000 | XX | 1,140,000 | ||||
| NA Not available.� XX Not applicable.� | ||||||||
| 1Data are rounded to no more than three significant digits; may not add to totals shown. | ||||||||
| 2In 2005, 14,518 kilograms of gold and 207 metric tons of silver were recovered from concentrated ore. | ||||||||
| The average value of gold and silver per metric ton of ore concentrated was $1.66. | ||||||||
| 3Includes gold ore, lead ore, silver ore, silver-copper ore, zinc ore, and ore shipped directly to smelter. | ||||||||
Source: United States Geological Survey Mineral Resources Program