Most of those mothers are in the pluton hotel, it's true. The pluton or intrusive theory of gold is pre 1945. Today it is not as widely accepted. QFP is considered to be the more correlative ore packer. Set up on the pillow lavas, drill through the tuffs/ore/shear zone into the fedspar porphyry seems to be the order in 90% of CDN gold stories.
Down in the lower americas the story changes somewhat but a felsic thingie is generally needed. Quartz and sulphides and shear are still a strong story. Low sulphide jasperoid thingies are very common too, though. The US has all these limestone thingies with sulphides and gold. MLM has one in Montana that is interesting. Small so far.
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