Agreed. I JUST discovered the more interesting properties of Tiberium.
I've been trying to train myself to recognize the high-value rocks/metals by color. The rocks are pretty easy, but many of the metals are almost indistinguishable from iron until you pick them up.
My idea is to maximize money/time by only sending my sim to pick up the most valuable items lying on the ground. I'll start a strict collector Sim in Riverview (since the location of various collectibles is easier to track). He'll be athletic, loves outdoors, loner, insane, and neurotic (just to keep things interesting).