I seem to recall some article some years ago in which platinum was
found along with silver in South America. It seems that some of this
strange/ strong metal was used in the casting of Spanish cannons.
In Florida those cannons that have been found in the ocean from
wrecks are sometimes used as ornaments in front of business's. It
seems that some restaurant had one of these cannons sitting out by
the road for some 20 years before it was discovered that the thing
had a very high platinum content. How high? How high does it have to
be in a cannon that weighs several hundred pounds.
Maybe this is "urban legend" and I can't remember just where it was
that I read this but it was something that stuck in my mind.