Ann: Toweranna drilling expands high-grade gold footprint, page-146

this is what is possible with in quartz veining!

Quartz veins often fluctuate widely in value, with the richest gold ore occurring in pockets or “bonanzas” as they are sometimes called. In some mining districts the bulk of the gold is found in these rich pockets and the rest of the vein may be nearly barren. Where the normal gold concentration might be a tenth of an ounce per ton or even less, a rich pocket might contain 20 or even 100 ounces per ton—and sometimes even more. In some cases the locations of these pockets can be predicted.
remember blue moon ? the gold is there but it is hit and miss!