ok, here's some quick ideas on where resources might be located (before i start editing the map itself) ...
1)easy one is wine country in sonoma and other places
2)central valley (that I've driven through and know firsthand) with cows, cows, and more cows...
for the metal resouces i've started just searching on google for "[metal] mines california"... i think adding a temperary overlay of the major freeways (as railways with markers) to assist in correct placement of resources
if i decided to get really crazy on this, I could go over to the college of natural resources here at Cal and look at maps that they have...they might even get it on it (however, i gotta graduate first, i wouldn't do that till the summer)