The metal was used by pre-Columbian Indians but platinum was "rediscovered" in South America by Ulloa in 1735 and by Wood in 1741. In 1822 plenty of platinum was discovered in the Ural Mountains in Russia.
Platinum and Gold would be useful in UFos along with Fiber optics if you wanted to build a Time Space vehicle like a UFO that runs off the magnetic fields of Earth because Platinum is the best conductor for electricity known on earth so far.
So, to me it is interesting that pre-Columbian Indians would have platinum because what use would they have for this unless they were remnants of a UFO or earth traveling (by air or space culture?)
Though Platinum is more valuable than Gold it is far more useful in a culture for electrical instruments than for any other single purpose if you are living in a technological society that might travel the world or into space.
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Platinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name is derived from the Spanish term platina, meaning "little silver". Platinum is a member of the platinum group of elements and group 10 of the periodic ...