What is the current estimate value of the world's mineral production in terms of USD ?

The top 5 mining countries (South Africa, Russia, Australia, Ukraine and Guinea) are sitting on about 4 trillion USD of wealth at current estimation giving a total annual income in excess of 500 billion USD. Globally it is very hard to say but you could effectively triple that and then triple it again when you attempt to predict price rises against availablility and changes in technology and supply/demand.