The assumptions and evidences upon which the present "alkaline" theory of ore solutions is based are briefly summarized. A number of detailed criticisms of this theory are presented from the viewpoint of wall rock alteration. The tentative conclusion is reached that there is impressive evidence from a number of mineral deposits that ore solutions are originally acid and become neutral or alkaline only after long travel and recognizable reaction with their channelways. It is proposed that "acid" minerals develop in near-source environments.

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