You can turn on the "resource icon" overlay which will put up floating icons showing what all the resources are (ctrl+r, or click on the "toggle map options" button to the left of the mini-map and tick "resource icons"). If you then zoom out you should be able to see where the resources are quite easily, and what they are.

You can turn on the "resource icon" overlay which will put up floating icons showing what all the resources are (Ctrl+R, or click on the "toggle map options" button to the left of the mini-map and tick "resource icons"). 
If you then zoom out you should be able to see where the resources are quite easily, and what they are.