[Crevan]

So what I must do if my nation cannot detect those sites, or my mages have limited skills, or skilled in just 2-3 paths of magic? Strategy of searching "Cheap scan in early game > ARec in mid-game" is quite easy and effective
First you get just 2-3 types of gems, but you can use them right now. Late - with ARec you receive different types, so you can improve your own mages or hire neutral specialists (for me - now Marignon longplay MP - it`s Jade Sorceress/Enchantress for Nature and Water paths, Necromancers for Death and I`m lucky to find Silver Order so I can use Astral and Air magic)