Bisbee daily review., 1918-01-06

get to our maximum capacity of 150. 900 tons per month in January without fail
 ! The ore is mining to somewhat bet ter grade than our estimates call for. So far the average has been nearer 1% per cent than 1ls. and the extrae- tion has come up to our expectations.
 The ore is mined. by three steam shcvels. It is exceedingly coarse and broken and requires large amount of
 shOoting to break up the larger bOulders. The shovels are tended by standard locomotives with eight tS) thirty-five (35l ton standard dump cars each The ore is hauled about a mile to our crushing plant and is dumped direct from the cars into No. 24 gyratory crusher, which has an opening of 4S inches by I20 inches This crUsher has Q double discharge and there are two No. s gyratOries on each side. or four (4l il all. below The ore from the mine is crushed to a ten (10) inch cube in the big crush CT and thence passes by gravity to the four t4) No S's. where il is crushed to about a four (4l inch cube. and from thence it is conveyed by belts to a ten thousand QO.OO0l ton storage bin
 The fine crushing plant for leach ing purposes consists of four (4l units of SymOns disc crushers containing two 12) each. The ore from the bin is conveyed to each unit by separate belt In each unit the ore is received by one disc crusher set to crush to about a maximum of three-QuarJers of an inch. The discharge is screened and the oversize goes to two (2l small CT crushers set to crush fine and the ore is crushed so that it will all pass a three (3l mesh screen. From these crushers it is conveyed to one of the Q1) teaching tanks. which are so feet square and Is feet deep. and each hold 5cO0 tons of ore. These tanks are made of reinforced concrete and are lined with lead. The tanks are paved with asphalt underneath to catch any leakage. but fortunately ther is no leakage except on rare occasions. The ore is leached in series. The solution containing the least acid being passed to the fresh ore and the ore that is nearly spent receiving the strongest acid solutions. The saturated solu- tion passes to towers, where it is treated with sulphurOus acid gas to reduce ferric sulphate. and thence to the tank house. where a certain amount of the copper is precipitated. Some additional acid is then added and the solution passes to the leach ing tanks to have the copper that has been deposited electrolyticalIy re- plenished. Owing to the fact that iron and alumina is dissolved out of the ore and is not precipitated We pass a certain amount of the solution current ly to launders containing scrap iron. where the copper is precipitated and the waste liquors are conducted out to ponds on the desert. in this way avoid ing approximation.
 We estimate that We will produce about seventy-five C75l per cent Of our copper as electrolytic copper and twenty-five (25l per cent as cement copper The e'ectrclytic cooper is shipped directly to New York. where it is melted and cast into merchsntahle shapes The cement copper is shipped to Douglas. where it is melted and cast into bars which have to he re fiped-
 The plant has passed the expert mental stage and is a complete sue cess.
 'I enclose you a set Of photographs on which I have written some slight description. Yours truly
 ''L- D. RICKETTS,"
 The foregoing from Dr. Ricketts is a brief statement of what has been done and of what will be accomplished in the future. The bringing up of capacity to that predicted and ct such an early date from the starting of the plant is . fine accomplishment
 The Grade of Ore
 It is also most gratifying that the