| Summary: | Accounting books of the Caboga (Kabužić) brothers 1426-1433
(Squarço/Reminder, Journal and Main Ledger) kept at the Historical Archives
of Dubrovnik provide new evidence for the composition and advanced levels of
processing of precious metals from Serbian medieval mines. Notably, that the
residue left after the process of obtaining fine silver was copper. Even the
price of the refining process is specified. Two items of a transaction
entered in the Squarço in 1430 contain some previously unknown data about
auriferous silver (argento di glama). Besides gold, it also contained copper
and, moreover, the ratio of the two per pound is specified. Apart from the
Caboga brothers’ accounting books, neither the other written sources nor
geological research have provided any indication about the presence of copper
in the auriferous silver mines.
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