Sorium seems a bit sparse in my current game;
Minerals discovered on Jupiter: Sorium 357,500 (0.4)
Minerals discovered on Saturn: Sorium 482,160 (0.5)
Minerals discovered on Uranus: Sorium 102,240 (0.6)
My fingers are crossed for Neptune.
However I'm liking 2 colonies in particular:
Luna; Duranium 2,548,697(0.9), Corundium 2,335,951 (0.6),
Mercury; Duranium 7,620,608 (1), Gallicite 2,143,296 (0.5), Mercassium 1,259,782 (1), Tritanium 152,412 (0.
, Corbomite 38,103 (.01), Sorium 29,173 (0.1)
Also Callisto has 1 million each of Corundium and Neutronium at high accessibility, so my construction projects are looking very secure for the future.