I have been picking ( not mining) my local range berms for years! Just looking for the cast boolits shot. This year I can't believe the amount (about a 30% increase ) in pure zinc slugs in the berms. Actually they are easy to pick out because they usually are not deformed much and show a large amount a strata marking & of course you can't "clip" them with snippers...but for those of us that mine the naked lead! ....beware! It is actually worse then searching for lead wheel weights!