Silverless map ?

[Gumbolt]

Overall I treat resources popping up as a random event. A nice treat when it happens. No point beelining IW on the basis of a resource might pop up. Chances are you might of found iron anyway.

On last game I had 64 mine and copper popped up around T174 or so. Unclear if stats treats 64 as worked mines or built mines.

 

[6K Man]

I've experienced maps with no Crab. Everyone hates getting stuck at a pole to start the game, but if your high latitudes are all ocean, you probably won't see any Crab/Silver/Fur/Deer