What country was platinum discovered?

I think it was California well during the 1800 in goldmines. Maine, New Hampshire, Rhode Island and Vermont could be candidates, but the quantities were very small and no significant mining was done. (Gold, as it turns out, can be found in most all of the fifty stated, but, again, the concentrations are not significant.) The Georgia gold rush in 1829 preceded the California gold rush by almost 20 years.