| 2610.00.00 | 60 | Having a chromium content equivalent to 46 percent or more chromic oxide (Cr2O3) | t Cr2O3 t | | | |
| 2611.00 | | Tungsten ores and concentrates: | | | | |
| 2611.00.60 | 00 | Concentrates | kg W kg | 37.5¢/kg on tungsten content | Free (A,AU,BH, CA,CL,E,IL,J,JO, MA,MX, P,SG) | $1.10/kg on tungsten content |
| 2612 | | Uranium or thorium ores and concentrates: | | | | |
| 2612.10.00 | 00 | Uranium ores and concentrates | kg | Free | | Free |
| 2612.20.00 | 00 | Thorium ores and concentrates | t | Free | | Free |
| 2613 | | Molybdenum ores and concentrates: | | | | |
| 2614.00 | | Titanium ores and concentrates: | | | | |
| 2615 | | Niobium (columbium), tantalum, vanadium or zirconium ores and concentrates: | | | | |
| 2615.10.00 | 00 | Zirconium ores and concentrates | kg | Free | | Free |
| 2615.90.30 | 00 | Synthetic tantalum-niobium (columbium) concentrates | kg | Free | | 30% |
| 2615.90.60 | 30 | Niobium (columbium) ores and concentrates | kg | | | |
| 2615.90.60 | 60 | Tantalum ores and concentrates | kg | | | |
| 2615.90.60 | 90 | Vanadium ores and concentrates | kg V2O5 kg | | | |
| 2616 | | Precious metal ores and concentrates: | | | | |
| 2616.10.00 | | Silver ores and concentrates | | 0.8¢/kg on lead content | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,MA,MX, P,SG) | 8.8¢/kg on copper content + 3.3¢/kg on lead content + 3.7¢/kg on zinc content |
| 2616.10.00 | 10 | Copper content | Cu kg | | | |
| 2616.10.00 | 20 | Lead content | Pb kg | | | |
| 2616.10.00 | 30 | Zinc content | Zn kg | | | |
| 2616.10.00 | 40 | Silver content | Ag g | | | |
| 2616.10.00 | 80 | Gold content | Au g | | | |
| 2616.90.00 | 10 | Copper content | Cu kg | | | |
| 2616.90.00 | 20 | Lead content | Pb kg | | | |
| 2616.90.00 | 50 | Other precious metal content | g | | | |
| 2616.90.00 | 30 | Zinc content | Zn kg | | | |
Harmonized Tariff Schedule of the United States inquiry: 3920590000
