[renormalised (Carl)]

On closer inspection there, it's looking more like a cataclasite...a really busted up piece of granite that's been altered via faulting and brecciation. That's one messy bit of rock!!!. Seen plenty of them, but it's still a good example of that type of geology.

I can see plenty of alteration of minerals in this shot....embayed quartz, micaceous alteration of feldspars, engulfed crystals etc.

That could possibly be part of an ore body....maybe gold. Or at least be associated with the formation of one. The fault would act as a conduit for ore bearing fluids percolating through the rock.