Worked from 1954 to 1970, this was once a HUGE open pit mine over 750 feet deep. It is famous for a find of these sparkly, turquoise-blue chalcoalumite specimens, often associated with a deeper electric-blue azurite. This is classic for the finds, and with the rich association is just a beautiful specimen. It is of very good size, too - most we have seen are smaller. The chalcoalumite forms rich growths into a protected pocket and so is preserved in excellent condition. Valenzuela, Frank obtained this specimen as a gift from his wife's uncle, Daniel Estrada, who was a driller for this mine (He collected this piece in the late 1950's). Joe Budd Photos.