Global silver trade from the 16th to 18th centuries American mining for the early part of the 16th Century. Mining in the Americas became formally industrialized when the process of mercury amalgamation became popularized. Mercury amalgamation was invented by a Spaniard in central Mexico in the 1550s. Historians dispute what individual was the first to invent the process, however most agree that it was a Spaniard. Mercury was the one of the highest costs of production for the Americas, since much of it had to be shipped. The ratio of Mercury to silver produced was about two to one. Furthermore, German miners introduced the stamp mill and lead smelting
The Robot vs. The Aztec Mummy in the production schedule. The evil Dr. Krupp (Luis Aceves Castañeda), a mad scientist known as "The Bat", managed to escape the snake pit into which he was thrown at the end of "The Curse of the Aztec Mummy" and continues his efforts in this film to steal a valuable Aztec treasure from the tomb of a centuries-old living mummy, Popoca (Angel di Stefani). Krupp builds a robot with a human brain in it, planning to use it to destroy the mummy, should he return to thwart his efforts. Krupp's former colleague and original finder of the mummy, Dr. Eduardo