Electrowinning Silver Dore Bars
Dore bars from electrowinning cells in silver heap leach operations, impure with 80% Ag and 15% Au. Unwrought form under HTS 7106.91.10.20 due to silver predominance and lack of full refinement. Used by mints and refiners.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If rolled, drawn, or processed into semimanufactured
Any working beyond unwrought (e.g., hammered sheets) moves to semimanufactured silver in 7106.91.50.
If alloyed with platinum group metals >2%
PGM (iridium etc.) over 2% treats as platinum alloy per Note 5(a), shifting to Chapter 71 heading 7110.
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Import Tips & Compliance
• Include process flow diagrams in entry docs to verify electrowinning origin
• Separate cathode dore from anode slimes to avoid 7112 classification
• Beware FTZ procedures for refiners – must exit as classified product
Related Products under HTS 7106.91.10.20
Gold-Silver Dore Bars
Dore bars are semi-refined bullion containing a mixture of gold and silver, typically produced from mining operations before full separation. Classified under HTS 7106.91.10.20 as unwrought silver dore, where silver is the predominant precious metal by weight per Chapter 71 Note 5 rules. These impure bars require further refining to separate the metals.
Unrefined Silver Dore Ingots
Impure ingots from primary silver mining, assaying 70-80% silver with gold impurities, in unwrought form ready for electrolytic refining. Fits HTS 7106.91.10.20 as dore bullion where silver predominates. Not suitable for fabrication without purification.
Bolivian Potosi Silver Dore
Traditional dore from Potosi mines, high-grade silver (85% Ag) with doré characteristics from amalgamation. Unwrought silver bullion under HTS 7106.91.10.20. Historic import source for U.S. refineries.
Heap Leach Silver Dore Pours
Poured dore from cyanide heap leaching of silver oxides, 72% Ag. Meets unwrought dore criteria for 7106.91.10.20.
Miller Process Silver Dore
Partially refined dore from Miller chlorination, impure silver phase. HTS 7106.91.10.20 as unwrought.
Peruvian Silver Dore Bars
Dore from Yanacocha operations, silver-gold mix. Silver dominant for 7106.91.10.20.