Well here it is, This is the outside of the "mystery machine", it sits beside the railway track in Cobalt.
The picture in the earlier post was taken through one of the windows looking toward the nose of the drum. At one time the whole drum spun and big iron balls tumbled around within, pounding silver bearing ore to powder. In this respect I suppose you could say that the machine was a rock tumbler of sorts. Well done Aneil of "totaltrust". Jonathantu had suggested that it might be a sarlacc. try as I might nobody seems to be able to tell me what that is. How about it Jonathantu?