Show cyanide laboratory tests van F furman in it A paper upon labora laboratory toly tests in connection with the extraction of gold from ores by the cyanide process says tho the history of the development of the p process r icess in the united states stales has been analogous to that of oll all new processes proc sacs esNes many failures tire are to be recorded ile ed and a fow few successes it la Is the opinion of the writer that had tho the following simple tests been better belter understood ninny of the iho failures bould not have occurred and wo we should probably havo a larger lamer no number ber of successful ful plants in operation opo rallon while I 1 lie hie process la Is not simple but requires a libath of chemical and longin cering skill tile tho determination of 0 the adaptability of nil an oro to tile iho method Is in generally not difficult while title the iho laboratory insults will mill not always coincide with the antuni results obtained in the mill they will mill 1 deive ei ve na a a gulde and control on t the lie working of tho lie mill and v will III alIv suffice I 1 to 0 determine if tile ore can bo be economically acal ly treated by the lie process objection n may y rea reasonably scina bly be roads mad that in small tests testa conditions different from those which occur on a larger aicale aro are introduced however tests mado made on from twenty iv iivo to a hundred pounds of ore should bo be closely duplicated in tho the mill tests on oil a smaller scale will serve to show what may bo be expected in tho the mill in determining tile the adaptability of an oro to this method of treatment and t the ile percentage of extraction which may bo expected in tile the n III tho the follow must receive revel vo consideration tho the percentage ninKo of extraction mill v generoli V lie be holew hat higher in tile tho laboratory than in tho the mill but the consumption of cyanide will also also bo be higher in ilia laboratory A most important imp p 0 point N the character of tile ilie ore particularly tile tho manner in fit which the gold Is contained in it whether it Is 14 in tho the free mate coarse or line intimately associated m till p rites or other sulphides sulp hides the iho character of tile tho sulphides sulp hides with milli which it Is atad whether it I 1 li combined or allowed with mith bismuth tel lullu in or other oilier elements an examination by the rye eye with or without tile tho old aid of a crying glass will frequently settle these points should the sample be in a finely pulverized condition careful may bo be resorted to with advantage |