|The use of metal clamps in T-Grooves has been discovered in Tiahuanaco, Ollantaytambo, Koricancha and the site of Yuroc Rumi, Vilcabamba. These clamps were also used on the Parthenon, on buildings in Mesopotamia, Egypt and Cambodia.Some scientists have suggested the clamps were for ceremonial use. Other researchers point out that ancient metal clamps served for keeping the blocks together, so they would harden out in the right position.Several imprints show that metal clamps intended to join huge blocks of stone that our modern machines cannot lift.|
The clamps from Pre-Columbian South America that have been examined show them to be made of a very unusual alloy - 2.05% arsenic, 95.15% copper, 0.26% iron, 0.84% silicon and 1.70% nickel.
This composition is particularly interesting because there is no source nickel anywhere in Bolivia. At first archaeologists believed that clamps were brought to these grooves to be placed, but recent scans have revealed that metal was poured into these indentations, which means the builders had portable smelters.
The metals used could only be melted at very high temperatures; temperatures the ancients (to our knowledge) were not capable of. The rare alloy of nickel-bronze-arsenic requires extremely high temperatures. The Puma Punka brackets holes, when analyzed, showed platinum, a metal which only melts at 1753 C and aluminum, which supposedly was not discovered and produced in quantity until the 19th century.