Base bullion
smelted lead containing impurities, as gold, silver, or zinc, that are later removed.
Historical Examples
It was obvious that the ingot was base bullion, and on the face of the affair there was clear proof that the Tartar had sold it.
Travels in Tartary, Thibet, and China Evariste Regis Huc
The ingot was handed round, and all the clerks saw that indeed it was base bullion.
Travels in Tartary, Thibet, and China Evariste Regis Huc
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