Arizona republican., 1913-09-14
Miami


 near the above place.
 Miami
 Miami Copper Company output for August totalled 3,097, 300 pounds.
 The following is from the Mining and Scientific Press of August 90 and We thought it would be interesting tU some of our readers. especially as We have quicksilver properties so close to our own city:
 Recovery of Quicksilver From Ores
 During the last two years. inquiries have been made by the United States Geological Survey relative to methods of recovery and QuantitatiVe data on the subject has become available for the first time. This data shows the insignificant total output from re- torts although large number of re- torts usually are in operat tiOn.
 Quicksilver retort furnaces are of two types: the pipe retOrt and the D retort. Both work on the principle of distilling off the mercury from the ere separately from the bases of com hustion and conveying the volatilized metal through short outside cOndens- ing pipes to d trough in which the mercury is collected The retorts are built over fire boxes and are filled and discharged horizontally from the same doors and from the furnace floor. The D retort by means of iron pans resting on the flat bottom and the pipe retort by semi circular sho- Vels and hoes. RetOrt plants contain fl om l to 15 retorts F being the usual number for pipe retOrt plant and are inexpensive to build and Op- crate It has been estimated that :: r inch pipe plant costs from 5000 to $500, depending upon local condi- tions. The pipes themselves cost $25 to s35 WheIeas the D retorts cost about s250 each The D retort, however. in creases capacity and decreases space Recovery is probably - per cent of metal in the ore charged.
 Retort plants serve useful purposes at small mines or in prospecting or early development but are best used perhaps for treatment of rich ore md concentrate or furnace soOt Cn- less carefully operated they menace the health of workmen by causing salvation, and when in operation at new mines the temptation is to gouge out rich ore for them and possibly
 
 otherwise might be remunerative
 The great bulk of the present do- mestic output is from shaft furnaces in which, as is well known. the dos cending ore meets the upward fur mace flames and gases and the vo- latilized metal passes with the gases and impurities of combustion into a series of condenser chambers usually of brick. in which the metal is col Iected and from which it is drawn off
 The gases pass from the final chamber to the stack usually through an inclined flue. The modern tend ency is toward the increased use of the Huttner tile furnace perfected by Robert Scott formerly of the New Almaden mine which is adapted to both medium and fine ore All the furnaces in Texas and Nevada are of this type. At New Idra. also, are the coarse ore furnaces designed by l.. NJ. Newcombe and at the Guada- lupe are the Danev modified Litch- field furnaces Some thought and experimentation have recently been given to the application of rotary furnaces for quicksilver ores It has been estimated that Scott furnace can be built under favorable local conditions at about $10O0 per ton of capacity. According to this the com mon l0-tOn furnace should cost about $1O,O00