look at all the hard green rock maybe Emerald and the dark stuff above your head and maybe gold looking stuff strait across from your right hand.
Very true and 100 years later the waterfall could have replenishedThey couldnt have gotten it all sounds like a fun adventure you got on your hands. I'd grid the whole area and test pan it all. You never know what you will find, that you found gold on your property at all is very cool! Keep us posted!