Well, answer this.
From the end of one of the movies The Venus Project did.

they said, something to the effect: that we haven't done an global analysis of what natural resources we have.

How on earth would you do that? There are pyramids in the jungle of central america that we still haven't found. Further, how would you catalog, say lithium if you were living in the 1950s? We do not know what will be important in the future, and we have no way of doing that many tests.