Bisbee daily review., 1915-11-21

each other, adding materially to con venience. Ore hoisting is done in four 12ls-ton skips-there are two skips in each shaft-which are operat- , ed by set of engines in turn operated by a single hoistinR engine
 At the top of the hoisting shafts and on the tramming lines. are concrete pockets into which the ore is dumped ! by means of revolving tippers which will dump five cars at one time and by a single operation. From these com crete ore pockets, the ore is automat- ically loaded into skips which i'm turn are automatically hoisted by the ap- ' plication of an electric controlling de vice attached to the hoisting engines. l With four skips running it is therefore possible to dump one skip every 90 seconds in the hours of operations, goo tons per hour.
 Hoisting Equipment. The hoisting engines are electrically driven and are equipped with four drums, 10 feet in diameter and hsins 5-S in. cable These hoists are set under one roof to the east of both shafts
 The feature of these hoists is the electric controlling device which was originated by engineers in the employ ment of the General Electric Com pany. By means of it the hoisting en- gineer can start the operations of the hoist and need give it no further at tention except to observe that all con tinues 10 run smoothly When ona pair of drums finishes revolving, the i brackets on the other pair are immedi- ately and automatically released and the second pair of drums is thereby i put into operation while, meantime, i the brakes are being automatically ap- piled to the first pair
 The direct current for the hoist mo- tors is supplied through the medium of a fywheelmotor generator set. The motor is of the induction type and is driven by means of power obtained from the U. s Reclamation service plant at the Roosevelt Dam transmit ed from thence direct to the Inspira- , tion plant over the transmission line
 Coarse Crushing Plant. After the ore is dumped into the 1 skip bins at the collars of the two ! shafts it is fed by means of pan con l veyors to the plant. In this plant are contained four large gyratory crush CTS followed by eight screener disc crushers and the ore is broken to the
 size required.
 From the coarse crushing plant it Is
 delivered to the storage bins by means
 of two 36-in. conveyors and is further transferred into the distributing con
 veyor above the storage bins. These
 bins have a storage capacity of 25,0OO
 tons and are so constructed that a
 train of IA ore cars, 6O-tons capacity, can be placed under each of the dis charge gates.
 Milling Operations.
 From the storage bins the ore is taken by train over a standard gauge railroad to the concentrator which is situated about a mile and Q quarter from the mines There the ore is
 dumped from the cars into the mill
 bins which have 6 capacity of 10000
 tons. From thence it is drawn and
 fed to a battery of Marcy Ball mills.
 After this treatment the pulp is fed
 to Notation machines being further
 treated on two-deck Oyster concen-
 trating tables The middlings from the tables are then reground in liar
 dinge Mills and are returned to the
 Notation tables for further treatment and concentration The concentrates
 are discharged into an Oliver filter
 plant where they are dried and then
 delivered by car to the International Smelling Companys reduction works
 located about three-fourths of a mile
 east of the mill
 Joint Power Plant. In conjunction with the International [ Smelling Company, the Inspiration