Nickel in TechReborn? : r/feedthebeast Reddit
TechReborn is supposed to be a GregTech 3 lite, of all the grindy stuff TR kept, reliance on a biproduct could be one of them. Like Titanium you may need to get it from a biproduct source. IIRC nickel is attained by industrial grinding iron ore. Probably wrong there. But I don't remember nickel having it's own ore.