this research comes from a man that has spent many years in this part of new mexico,go to his website and read all that he has written on metals, it will take quite awhile but is well worth the time,i find him to be very helpfull if you e-mail him for info.. he has always responded to my questions with very good advice, i have encouraged him to publish some of his 'stories' (for lack of a better word). give it a try , i think you will like it. whitt459