Show SUBMARINE concentrator if suitable ground can be secured a new invention for the recovery of placer gold or black sand containing gold will be set up on oil lynx creek says the courier prescott arizona the new contrivance known as cooleys colleys Coo leys submarine concentrator is so arranged that it acts very much in the manner of a gold pan in the hands of a skillful placer miner the he machine has a sidewise and jigging motion the gravel being submerged in a long tank of water As in panning by hand the heaviest substance goes to the bottom A mechanical arrangement carries away the upper and lighter part of the mass of rock and sand being treated and riffles fiffles assist in the pocketing of the gold it is found that a high percentage of recovery is made and that this can call be accomplished with comparatively little water tile the concentrator is also useful in separating heavy black sand from the mass of gravel tile the sand being afterward treated by cyanide or other p process process for tile the gold contained in it the con concentrator cen is operated with a 10 horsepower engine |