We (San Francisco Mining and Scientific Frees) have been shown a model of a device for caving gold and other precious metals that will doubtless ultimately work its way into favour able use, and be worthy, of the appellation of *' Gold Gleaner," whioh has been given it. Since the inventor, Mr Bryan Tyson, over five years ago, constructed the first device of this kind, important and valuable changes have been made. It is especially designed for saving fine gold and rusty gold, black eand, sulphurets, etc., from the tailing*, of' either quartz or hydraulic mines. Much gold is, aslfr Tyson believes, lost by attempting to pave it in the midst of too ' much sand, or similar sub stances. His device "as now improved and re modeled, consists, in the first place, of a suitable arrangement for skimming, or rather cutting, out a thin stratum from the bottom of the flow ing eands. To prove the efficiency of this plan, he 'cites his experiment at' Bodie of August, 1878 In his first experiment he .worked the whole amount of' tailings as they flowed from the mill, and in two days took in amalgam and sulphide of silver 'to the amount of 13 doll. He then changed his device so as to work only a thin stratum of .tailings, taken from near the bottom, and in another two days took over 100 dols , having' increased his catch nearly eight fold. It is a model of this device, since greatly improved and reduced to machinery, of which we now speak. ., / ;'< ' The next feature consists in a simple and ■effective device for keeping the sands between ordinary rifle bari loosV, thu* apparently pre senting all necessary i facilities for the precipita tion and settling or^ the precious metals to a place of safety. . This .device, as Mr T. tells ue, baa only been partially tested, and yet answered an excellent purpose in a- ving both gold and quicksilver. Recent improvements, as pointed out to us, will doubtless render it far more effec tive.
