I'm starting to skill up my first Geologist and have 3 points in "natural copper vein" so I was thinking of going for "Quality Copper Mineshafts",but to get it I have to spend "5 books in the levels below". Given that I only have a certain amount of points to work with I really don't want to spend points in things I consider unnecessary,so what would be my best options? I was going to make this Geo concentrated around Ore-skills and have my next one be about marble and things like that.