Okay, some update, checked the original generated by gt6 old_barely_used_gt5_style_garbage_worldgen.cfg file, and there for example
but Venus itself be like:
nope, only galaxyspace sulfur and diamonds and lava pools
so whats next 
i mean - is it still worth try to add custom slot?
p.s. GalaxySpace-1.7.10-1.2.14
p.p.s. there are rocks at the surface with various ores though
