"The world's richest source of platinum and related metals is an enigmatic geological structure in South Africa known as the Bushveld Complex (http://en.wikipedia.org/wiki/Bushveld_igneous_complex). This complex of ancient magmas is known to have formed some two billion years ago, but the source of its metallic riches has been a matter of scientific dispute. Now researchers from the Carnegie Institution and the University of Cape Town have traced the origin of the unique ore deposits by using another of South Africa's treasures - diamonds."

Read more (http://www.ciw.edu/news/diamonds_reveal_deep_source_platinum_deposits)

Thank you for the link. I studied many samples (hand specimens and thin sections) from the Bushveld four decades ago. It was interesting to catch up on current thinking on the topic.

platinum is currently the most praised metal of them all...it would be interesting to know whether platinum is located also in USA