HUGE Black Hills, South Dakota Sample

This is the second most amazing sample Heidi & Conan Gold Prospecting collected in the Mountains of South Dakota.
Black Hills Gold Ore is famous around the world and may even have free mill gold visible on the surface or through crushing.  However, most of the AU found in ore is bonded with other elements like tourmaline and requires chemical methods or heat/smelt to release it from the rock.  You will have many hours of research to determine the make up of this HUGE rock.  WE EVEN HAVE SOME SILVER ORE!  So test, test, test.
Cheers!
HnC