i saw a mention in another thread about some types of lead denting other types of lead, my question is, is there anyway to come up w/ some good rules of thumb from this when scouting lead? i have visited several places that have lead, but don't know when i find high tin or other desireable elements to it. can anyone offer any insight to this ? is how big the dent is from a ball peen hammer an accurate test of what it is or are there to many other variables?