And just who**is set up to pour molten whatever on the spot and create block clasps in Egypt or the high Andes? Yes...mobile hot metal smith
Actually, that's a good question. You've been around HOT metals and would be aware of their melting points. But I was surprised to discover the following :
Analyses carried out by Professor Heather Lechtrnan of samples of cramps in situ at Pumapunku reveal a ternary alloy of copper, arsenic, and nickel. "Middle Horizon Metallurgy in the Titicaca Basin: A Preliminary Assessment 1994"
At sea level the melting points are :
Copper 1083 degrees
Nickel 1455 degrees
Arsenic 1550 - 1600 degrees. The main use of metallic arsenic is for strengthening alloys of copper.
One might ask the questions :
1) Why use an alloy of three different metals when it is only for a clamp?
2) Where did the Puma Punkans mine these metals or were they transported in?
3) How and when did the Puma Punkans learn metallurgy?
Or, maybe they just dug up a hunk of stuff (galena) and melted it down without ever knowing what were its components.
Hot work, though. And don't breathe in.