While searching for the Dutch Schultz box, in the Catskill Mts, one of my kids came accross a dense heavy rock. I paid no attention, as I was fixated on the box. Now that the box thing is over, I'm wondering if I had a piece of silver ore in my hand that could be from the lost silver mine. Can anyone recommend a condensed account in identifying silver ore, and tracing it to it's source. Thanks.