| Metal | Price in 2003 | Price in 2006 |
| Aluminum (ton) | $1,431 | $2,621 |
| Copper (ton) | $1,779 | $6,388 |
| Gold (ounce) | $363.5 | $670.7 |
| Lead (kg) | $0.515 | $1.170 |
| Silver (ounce) | $4.911 | $12.632 |
| Zinc (kg) | $0.828 | $3.095 |
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