Bisbee daily review., 1911-07-23
OLD DOMINION
(Dy Geo. L. Walkofl

ADg hto. h. VI aAhtl-f
 Globe, Arizona-Old Dominion's recent reduction in production costs must be credited to the management rather than wholly to the mine. President Smith and his directors are to be congratulated on their selection of Supt Doweil to man. age the eompany's affairs in Ari zona and particularly its smeltns operations. Since he took charge he has effected economies in prac- tically every department. the sun total of which is a reduction oi about two cents a pound in the cost of making copper.
 During the first six months of this year smelting costs have averaged S256 per ton. comparing with S2.9z for all of 1910 The cost Of mining has been reduced to about S4-oo per ton, which compares with Q cost of nearly S6 two or three years ago Leaks and unnecessary expenses have been eliminated m other directions. also and plans are being worked out which will re duce costs still further.
 One of the most important econ mics has been effected by a thor ough and scientific mixing of the great variety of ores from the com pany's mines, the object being to get a uniform smelter charge. The ore is now being hauled up the high line and dumped Into the coke-storage bin, discharged from there on a conveyor belt and then strewn in @ small stream into a string of railroad ere cars. which take it to the smelter bins.
 Perfect Mining.
 This is a temporary arrange- nent. but it has demonstrated that if effects a perfect mixing. Plans are being worked out to apply this system of handling in a much more economical way, and construction for this purpose will begin soon
 The advantages of a uniform ore mixture are many. It saves coke, reduces the loss of copper in the slae and eliminates the freezing Of furnaces. which cut down produc- tion and increase expenses. Before this system was inaugurated- old Dominion often made a 90 per cent matte one day and 50 per cent matte the next. Now it's smelter charge and matte are uniform, and its consumption of fuel and it's siag losses have been reduced t7 minimum.
 Eventually Old Dominion's orc handling and smelting costs will be reduced another 50 cents pei ton, which means a saving Of hal
 ffF n1rTTD1 produced.
 Another economy is being ef fected through the use Of fiu' dust in part for converter Things Ih this way approximately enougi Gue anst is smelted 10 offset th, cost of converting.
 While there has been a notabl' improvement ia the condition Q the mine, the average grade o the ore treated has not been raised The company is mining about 65 tons of ore daily, slightly less thai half Of which is miUed and th rest smelted direct The smeltin ore carries z to T5k per cent cor per and the milling 3lz to 4 pc cent. An average of B 10 per cen copper is recovered from all th ore mined, or 1o2 pounds to th ton.
 Ores Are chaneins.
 The milling of a cOnsiGerabl quantity of very low grade ore fo the sulphur and iron it contain tends to bring down the ayereg yield of Old Domiuion's entire out put. The ores of the mines ar gradually changing with depth frOr
 ell fraerHr q su!phides. and the prospect is tha there will be relatively less direC ssnelting and more cCDcentratin ores as the workings go deeper.
 The f6th level the bottom of ta old Dominion mine, is at dept os only about 200 feet. 1t mas not be considered as an old an deen. but as a comparatively virgil undeveloped mine. therefore. TheT is no reason to doubt that the Oi Dominion vein carries cOmmerci' ore as deep as it can be niine' 1000 or coco feet.
 Originally the Old Dominion ha one big shoot of ore in the centrs portion of its present working Two others have been devel0pe by tho extension of it's drifts. th longest Of which, the 12th, nearly 4.00O feet, or three-QuarteI of a mile.
 Tn the east end, in ground 10 merIy owned by United Globe. large body Of cuprite ana gland ore, averaging tO 8 per cent col ger, and what promises to prove big deposit of f per cent concei trafing ore. have been developed.
 The west end of the mine has new surprise for the managemeI every few days. Some 60 to 2 per cent copper glance is bein