From Post.  https://forums.galciv3.com/462874/page/1/#3533309

Lower resource settings removes elerium from the map.

I revealed the map and could find no elerium. Started a new one again same issue. Start another on just huge with same result. 

So I changed the resource settings to abundant and now elerium is showing up. Below is a screen shot of the settings. Elerium will not show up on the lower settings but will on the higher.

 It is a easily repeatable bug.

Reduced 44%

Original 1280 x 768

Also in my opinion I feel resources are still a bit too abundant on the rare setting to be considered rare. Rare habitable planets seems pretty spot on though.

Been having lots of fun exploring the vast dark cold space looking for signs life and expansion, Insane map size really provides that one more turn feeling   .