| 2528 | | Natural borates and concentrates thereof (calcined or not), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight: | | | | |
| 2528.10.00 | 00 | Natural sodium borates and concentrates thereof (whether or not calcined) | kg | Free | | Free |
| 2528.90.00 | | Other | | Free | | Free |
| 2528.90.00 | 50 | Other | kg | | | |
| 2529.30.00 | 50 | Other | t | | | |
| 2530 | | Mineral substances not elsewhere specified or included: | | | | |
| 2530.90 | | Other: | | | | |
| 2530.90.80 | | Other | | Free | | 0.3¢/kg |
| 2530.90.80 | 50 | Other | kg | | | |
| 2601.11.00 | | Iron ores and concentrates, other than roasted iron pyrites: | | | | |
| 2601.11.00 | 90 | Other | t | | | |
| 2601.12.00 | 90 | Other | t | | | |
| 2604.00.00 | 80 | Other metal content | kg | | | |
| 2606.00.00 | 60 | Other | t | | | |
| 2606.00.00 | 90 | Other | t | | | |
| 2613.90.00 | 00 | Other | kg Mo kg | 17.8¢/kg on molybdenum content | Free (A+,AU,BH, CA,CL,D,E,IL,J, JO,MA,MX, P,SG) | 77.2¢/kg on molybdenum content |
| 2614.00.60 | | Other | | Free | | Free |
| 2614.00.60 | 40 | Other (including rutile and rutile sand) | kg | | | |
| 2615.90 | | Other: | | | | |
| 2615.90.60 | | Other | | Free | | Free |
| 2616.90.00 | 50 | Other precious metal content | g | | | |
| 2616.90.00 | | Other | | 1.7¢/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 |
| 2617 | | Other ores and concentrates: | | | | |
| 2617.90.00 | | Other | | Free | | Free |
| 2617.90.00 | 60 | Other | kg | | | |
Harmonized Tariff Schedule of the United States inquiry: 3920590000
