Not trying to be a spoil sport but just because one finds fine gold or even species in a vein it dosen't mean that the veins/or veins contain payable material.It's only ore if it's economical to extract and process it.But then again any gold found in a quartz vein is worth following.The gold goes in and out in a vein if it's there at all.Paystreals,lean,fines,species, pockets,barren, etc etc..or in any combination of the above.As far as a mine being close to your point of interest,that may or not have a bearing on your deal.If it's on the same lead or in the same zone of mineralization it may be good.What's good in one spot may have no bearing on a spot thirty feet away,or it may.