When a geologist discovers a new deposit( copper in this instance), the new deposit icon does not appear, although the icon for the mine deposit upgrades does appear. The icon displays onMouseOver but goes away when you move the mouse.
Also have you tried running your mouse over it? That will allow it to show so you can confirm "Hey I need to build that"
Clicking the mine in the build menu helps but if you dont recognize there is a mining node that needs to be built its like meh.
This is with ALL ore nodes. Copper, Iron, Gold.
space for bare / found depos is just blank like a placeholder for mine .. but no depo icons. until you go to build then it quickly flashes OOH ICON and poof gone while it builds. lol