Sentence:  ...but as far as African bedded deposits are concerned I think that the prospector following either the “ <WSD>lateralist</WSD> " or " profundist " advice will waste much time and money unless he is also guided by a study of possible  sources of the ore he seeks, and of the probable itenerary of the solutions to which such ore owes its present position. 
Meaning of the word marked with <WSD> tags:  Favoring a lateral approach or explanation over one that involves a different direction, such as a vertical one.