Simple Ball Mill Design Could be Useful in Crushing Quartz and Finding Gold

I thought this was a nice idea about building a ball mill. It might be good with small pieces of quartz that give a signal indicating metal (of any kind). I have found that quartz that sets of a detector, even if not in the gold region, still can have gold. It probably has to do with the density of the quartz and size of the cross section. Anyway, for a 51 second video, it makes one think about the possibilities. I am in the process of building my own version and hope to be done soon.

http://www.youtube.com/watch?v=tAFQ55YOA_E

courtesy of Pixabay