This WoGE is similar: It is a dune. Yet there are enough distinguishing features to place it in a fairly limited area, and I have included one feature making the location unique.
Previous WoGEs are collected by Felix on his blog and a KML file.
After a week has gone, and with Easter holidays coming up, I think it is time for a hint:
I followed a stream upriver to the source, and I think I may have found the source of the black coating on the dunes. It also explains why there is a mine in such an inhospitable area, the source area is even worse!