Um, ok, that goes against just about every resource out there...... but if you say so...
Putting A Trillion Dollars Of Platinum In Perspective | Zero Hedge dates january 2013
Amerigold: Why Platinum
Platinum
HowStuffWorks "How much gold is there in the world?"
Platinum – The Other White Metal

if you follow the dates, it steadily increase the number of cubic feet mined.......but they all say less than 30cubic feet mined ever, and that was just a 2 minute google search...