Add 'Material' to your Overlays

[Casey Dog]

An overlay similar to oxygen level to show, on the visible map, unworked / raw material would be helpful.  It is very difficult to find a specific material to dig toward when you are running short.  i.e. Select Material Overlay / Sub select Copper.  All copper not hidden by the fog of war would show colored.

It is very difficult for me to distinguish the various material icons (coal is not significantly different from dirt and even some of the minerals) at a glance so it breaks game immersion.  It is not fun to have to manually search pixel by pixel to find this information.