Zinc ores and concentrates
Zinc ores and concentrates
Duty Rate (from China)
Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Subheadings
Products classified under HTS 2608.00.00
Zinc Blende Ore
Zinc blende, also known as sphalerite, is the primary zinc ore consisting mainly of zinc sulfide (ZnS) with minor impurities. It falls under HTS 2608.00.00 as a zinc ore mined directly from deposits and used for zinc extraction after concentration. This classification covers natural zinc-bearing ores prior to smelting or refining.
Willemite Zinc Ore
Willemite is a zinc silicate mineral (Zn₂SiO₄) found in oxidized zinc deposits, often with fluorescent properties. Classified under HTS 2608.00.00 as a natural zinc ore suitable for concentration and smelting into zinc metal. It represents secondary zinc ores from weathered primary deposits.
Smithsonite Zinc Ore
Smithsonite (ZnCO₃) is a zinc carbonate ore formed through supergene enrichment in zinc deposits. It is imported under HTS 2608.00.00 as a zinc ore for roasting and leaching in zinc production. This ore type is common in nonsulfide zinc deposits.
Hemimorphite Zinc Ore
Hemimorphite (Zn₄Si₂O₇(OH)₂·H₂O) is a hydrated zinc silicate ore from oxidized zones of zinc deposits. HTS 2608.00.00 covers this ore as it is concentrated for zinc silicate flotation recovery. It serves as an important source for secondary zinc production.
Calamine Zinc Ore
Calamine refers to a mixture of zinc carbonate and silicate ores, historically mined for zinc extraction. Under HTS 2608.00.00, it qualifies as zinc ore when containing sufficient zinc for metallurgical recovery. Common in European and North American deposits.
Zinc-Lead Mixed Ore
Polymetallic ores containing both zinc and lead sulfides, such as those from Red Dog mine, with zinc as principal value. Classified under HTS 2608.00.00 when zinc predominates for separate concentration circuits. These ores require complex flotation separation.
High-Grade Zinc Ore
Direct shipping zinc ores with zinc content exceeding 30%, requiring minimal concentration before smelting. HTS 2608.00.00 includes these premium ores from deposits like Century mine. Valued for lower processing costs in zinc production.
Zinc Silicate Ore Concentrate Borderline
Low-grade zinc silicate ore fines suitable for heap leaching rather than flotation. Borderline classification under HTS 2608.00.00 as crude ore when not fully concentrated. Used in solvent extraction-electrowinning zinc circuits.
Irish-Type Zinc Ore
Carbonate-hosted massive sulfide zinc ores like those from Navan mine, dominated by sphalerite with calcite gangue. HTS 2608.00.00 applies to these high-volume European zinc ores for flotation concentration. Known for consistent grade and purity.
Sedex Zinc Ore
Sedimentary exhalative (SEDEX) zinc-lead ores like those from Sullivan mine, featuring sphalerite in fine-grained sediment-hosted deposits. Under HTS 2608.00.00 as primary zinc ores for selective flotation. Major historical source of zinc concentrates.