None of these editions are the one I have, which has the picture of the spacesuited figure, but is apparently not a reprint, but the original 1959 edition. (No, correct that: the critical/bibliographic essay at the end (by Lin Carter) implies that the edition I have was from 1966 or so). It's not in great condition--there're several loose pages, though none have fallen out yet. I think this book was also issued under the name Wolf's Head, but I can't be sure.
The orphan Joktar has been memory-blocked, and there's some evidence he's not human, though he doesn't know what he is.
The Earth presented in the start of the book is distinctly dystopian, with a high-tech totalitarian structure, which sends slaves offworld as a way of dealing with its 'excess' population. Fenris isn't much better, but it's more isolated, and the main dangers are natural, at least outside the company enclaves. More later.
Fenris, on the other hand, seems to be of the 'another planet without women' type. From all I can tell, there's not a single woman on the whole planet: not among the 'emigrants' in the mines, not among the company, not in the few towns, not among the 'colonists'. I began to suspect about mid-book that the 'Ffallian' represented the missing women in the story; turns out I wasn't that far off the mark. I don't want to spoil the surprise ending, though it's not that much of a surprise (it's telegraphed from early on), so I won't elaborate further.