recovered right after the conquest of Cortés with tumbaga gold bars The "Tumbaga" Saga: Treasure of the Conquistadors. Book about Tumbaga Bars The Art of Precolumbian Gold: The Jan Mitchell Collection, an exhibition catalog from The Metropolitan Museum of Art (fully available online as PDF), which contains material on Tumbaga Copper alloys Gold Science and technology in Mesoamerica Precious metal alloys