E/MJ : engineering and mining journal . been used extensively. These cars operate ontwo levels where the gage of the track is 20 in. They areequipped with M. C. B. couplers and roller all dump at an angle of 30°. This incline is satis-factory for Phoenix ores, which are coarse and compara-tively dry. When the ore contains a proportion of fine,damp material, this incline is not steep enough. For thisreason the cars recently constructed here for the Anyoxmine, where a portion of the ore is fine and sticky, werebuilt so that the incline of the box when dumping wouldbe 45°. These car
E/MJ : engineering and mining journal . been used extensively. These cars operate ontwo levels where the gage of the track is 20 in. They areequipped with M. C. B. couplers and roller all dump at an angle of 30°. This incline is satis-factory for Phoenix ores, which are coarse and compara-tively dry. When the ore contains a proportion of fine,damp material, this incline is not steep enough. For thisreason the cars recently constructed here for the Anyoxmine, where a portion of the ore is fine and sticky, werebuilt so that the incline of the box when dumping wouldbe 45°. These cars, having a capacity of 135 , alsohave a simplified leverage arrangement for opening thedoor, and as the door swings free, the opening will pass arock 4 ft. in diameter. By Sydney II. Ball* and L. S. Thompson! In the southwest Virgina lead and zinc field the oxi-dized zinc orebodies are prospected by means of a light,spring-steel core drill. The cutting shoe of the drill,shown in Fig. 1, consists of a split steel ring 6 in. in. PIG. 1. CUTTINGSHOE OF DRILL, DRILLING IPOWER •Superintendent, Granbyand Power Co., Phoenix, B. C. Consolidated Mining, Smelting diameter, beveled so as to make a cuttingported by a steel stirrup. The shoe weighand is operated as a percussion drill, being ?Mining- geologist, 71 Broadway, New ., 71 Broadway, New York. -ho ? and sup- . about 30 lb. pulled about December 16 916 ENGINEERING AND MINING J01 RNAL 1059 every 6 in. (the hi nf clay or oxidized zinc ores. As usually operated, the shoe i slung from a l-in. ropepassed over a sheave mounted on a tripod, as shown inPig. •.. Two men are employed on the rope to lift the bit,while a third stands a1 the In li to rotate the rope, ?the blows and throw the bit downward as il is too Lighttn work by gravit] alone and to clean the bit. Ilit tn 50 ft. arc drilled per daj of 10 br., the drilling cost ,exclusive of fixed charges and re-sharpening being about7c. per tt. The whole outfit, i
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
