Still working on sorting this stuff out,Time and Culture. Is the beginning a Alantians,Aztec/Mayan culture, then gone. Then a mediterranean group or groups working there sites.Then they are gone. They dont seem to have destroyed the others work, but seemed to have added theirs to it. I think the originals had big main storage vaualts,later they where broken down to smaller ones.Guess i just have keep digging for ansewrs. A real melting pot of time and culture.
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DTTH
The Atlanteans were all over the shores of Atlantic Ocean, but not far north and south from the tropics. They were not mining gold but only copper and tin because they liked bronze as their main metal for jewelry and decors. After their disappearance, the gold was discovered and subtituted the bronze, not because was more worthy but because was more easy to come to the same result like the bronze sight. For the bronze they would need two components copper+tin, which in the most case were not so close each other and they would go in another terittories to take one or the other. That would means wars with the owners of those metals if they would not agreeded to give it in exchange for another things.
In the Golden Ege, Maditeranean and Middle East civilizations went out searching for gold in new and unknown terittories, like America. They found gold but in the most cases they were banned by the natives of that era.
The Aztecs were a combination of European and Middle East civilizations who came to America for its gold, with Toltecs and Olmecs, and were " melting " together about 800-100 AD. The melting of the newcomers with the Toltecs occured at the " seven cities/caves of gold " known as Cibola, place located at the ancient American Native's gold mines which were " conquered " by the newcomers.
The Spaniards, who came little later on the scene of the Americas, went for the same reason, the famous ancient gold mines. They took all the gold and silver can find and searched for new deposits and worked the still found for over three centuries.
What little people know, maybe less than the fingers of a hand, how the Spaniards under Coronado comands and with the help of Franciscan priests, found the place of the " seven cities/caves of gold " and worked them secretly. I don't know the reason they never made it public in archives, because they had plenty of time, judging from the big deposits of gold bars they left in each of the seven caves. What is for sure, the Spaniards who worked the Cibola were massacred by the Natives and as a result the place remains unknown to the Saniards and the church, but not to the Natives of that terittory.
What is really amazing with Cibola, is how in the 1760's, Jesuit priests with the help of the Natives, hid in four of the seven caves their golden and silver church ornaments.
So, a place which you have mentioned to hold treasures added from different owners, is the seven "cities"/caves of gold, with one of them to holds, except Spanish and Jesuit treasures, the Monctezuma lost treasure.