RE:RE:RE:RE:RE:RE:Fosterville, a mere Junior to QueenslandThese orogenic gold bearing quartz veins form a similar pattern to that of a maple tree. You can think of the trunk as being the AFZ. The big branches are the second order faults (Keats-Baseline etc). The smaller braches are the third and fourth order faults and the leaves are the disseminated refractory gold/alteration halo. We are missing the refractory gold on the east side of the AFZ suggesting that the top of the tree has been eroded away on the east side.
You can also think of cinnabar, realgar, orpiment and stibnite as being the brightly coloured birds on the top of the tree. They are finding Stibnite on the west side implying a high state of preservation but not on the east side. Better preservation means more gold and deeper gold.