Those I-clamps at Tiwanaku are made of a particular alloy of iron, copper and arsenic that requires a smelter operating at very high temperatures.
A scanning electron microscope determined that the clamps were poured into place, necessitating a portable smelter.
All this in an area current theory denies an iron age.
jcolavito.tripod.com...
In Graham Hancock’s book Heaven’s Mirror is said.
A spectrografische analysis of one of the view been left clamp has demonstrated that they consist of a very unusual alloy of 2.05 percent arseen, 95.15 percent copper, 0.26 percent iron, 0.84 percent silicium and 1.70 percent nickel. There is nowhere in bolivia a source for nickel to find.
Moreover requires the rarely occurring alloy of arseen-nickel-bronze a melt oven with which one reach can extreme high temperatures.
Because both these images of where the clamps were poured into place are copyright protected, I post only the link to them.
Carved groove once occupied by metal clamp for joining stone blocks in Puma Punku temple , Tiahuanaco , Bolivia
img3.photographersdirect.com...
Carved groove once occupied by metal clamp for joining stone blocks in Puma Punku temple , Tiahuanaco , Bolivia
img3.photographersdirect.com...



