I been going to my ranch in mexico for the past 2 years and always see black sand everywhere. just join gpaa and just was wanting to know if anybody had tried the rio grande or rio grande area. might have to take a chance next time I go and go to the mountains and pan in the creeks see if I have any luck. I know there are lots of crystal formations in the rocks and granet. ( not valuable crystals I don't think) going to spend some time to see if I find anything. I will let yall know what I find and if I find some well I will invite anyone willing to travel. well until next time. I will post on later date on the outcome of my trip.