| 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: | | | | |
| 2529 | | Feldspar; leucite, nepheline and nepheline syenite; fluorspar: | | | | |
| 2529.21.00 | 00 | Containing by weight 97 percent or less of calcium fluoride | t | Free | | 13.5% |
| 2529.22.00 | 00 | Containing by weight more than 97 percent of calcium fluoride | t | Free | | $5.51/t |
| 2529.30.00 | | Leucite; nepheline and nepheline syenite | | Free | | Free |
| 2530 | | Mineral substances not elsewhere specified or included: | | | | |
| 2601 | | Iron ores and concentrates, including roasted iron pyrites: | | | | |
| 2602.00.00 | | Manganese ores and concentrates, including ferruginous manganese ores and concentrates with a manganese con- tent of 20 percent or more, calculated on the dry weight | | Free | | 2.2￠/kg on manganese content |
| 2602.00.00 | 40 | Containing less than 47 percent by weight of manganese | kg Mn kg | | | |
| 2602.00.00 | 60 | Containing 47 percent or more by weight of manganese | kg Mn kg | | | |
| 2606.00.00 | | Aluminum ores and concentrates | | Free | | $1/t |
| 2608.00.00 | | Zinc ores and concentrates | | Free | | 8.8￠/kg on copper content + 3.3￠/kg on lead content + 3.7￠/kg on zinc content |
| 2609.00.00 | 00 | Tin ores and concentrates | t Sn t | Free | | Free |
| 2610.00.00 | 20 | Having a chromium content equivalent to not more than 40 percent chromic oxide (Cr2O3) | t Cr2O3 t | | | |
| 2610.00.00 | 40 | Having a chromium content equivalent to more than 40 percent but less than 46 percent chromic oxide (Cr2O3) | t Cr2O3 t | | | |
| 2610.00.00 | 60 | Having a chromium content equivalent to 46 percent or more chromic oxide (Cr2O3) | t Cr2O3 t | | | |
| 2614.00.60 | 40 | Other (including rutile and rutile sand) | kg | | | |
| 2619.00 | | Slag, dross (other than granulated slag), scalings and other waste from the manufacture of iron or steel: | | | | |
| 2620 | | Slag, ash and residues (other than from the manufacture of iron or steel), containing arsenic, metals or their compounds: | | | | |
| 2620.11.00 | 00 | Containing mainly zinc: | | | | |
| 2620.19.30 | 00 | Zinc dross and zinc skimmings | kg Zn kg | Free | | 3.3￠/kg |
| 2620.21.00 | | Containing mainly lead: | | | | |
| 2620.21.00 | | Leaded gasoline sludges and leaded anti- knock compound sludges | | Free | | 8.8￠/kg on copper content + 3.3￠/kg on lead content + 3.7￠/kg on zinc content |
| 2620.30.00 | | Containing mainly copper | | Free | | 8.8￠/kg on copper content + 3.3￠/kg on lead content + 3.7￠/kg on zinc content |
| 2620.40.00 | | Containing mainly aluminum | | Free | | Free |
