Feel the same way. This is interesting reading in comparison: https://www.bisbeeminingandminerals.com/geology-c512

And this: https://www.geologyforinvestors.com/ic-introduction-alteration/

"Potassic alteration involves the formation of new potassium feldspar and/or biotite. There may also be small amounts of sericite, chlorite and quartz. This type of alteration is typically found at the core of porphyry copper deposits and is the result of alteration by very high temperature potassium-rich fluids."