Compressed air . fire or were exploded be-fore the other holes, considerable muck wasleft at the breast which required much addi-tional labor. The usual time needed to muckback was hour, but this varied consider- the total cost of labor performed in each head-ing. The cost of operating the machines pershift was $ for the large machine and $ the small machine; these figures, whichvary from month to month, include the costof everything connected with the operation ofthe machines: engineers wages, blacksmith ex-penses, new steel, repairs to the machines, costand repair of air-line
Compressed air . fire or were exploded be-fore the other holes, considerable muck wasleft at the breast which required much addi-tional labor. The usual time needed to muckback was hour, but this varied consider- the total cost of labor performed in each head-ing. The cost of operating the machines pershift was $ for the large machine and $ the small machine; these figures, whichvary from month to month, include the costof everything connected with the operation ofthe machines: engineers wages, blacksmith ex-penses, new steel, repairs to the machines, costand repair of air-lines, etc. The cost of labor,per foot driven, by the large machine was $,and by small machine $ The cost of explosives, a detailed report ofwhich is given in Table II, shows that the 40per cent, dynamite costs $0,127 per lb., thefuse, $ per ft.; and the caps. $0,007 each. These figures, which include freight, unload-ing, wages of the powder man, and one-thirdof the wages of the store-keeper, represent. FRONT ELEVATION SIDE ELEVATION P tM^ FRONT ELEVATION SIDE ELEVATION Fig. Fig. 2. ably. Flat steel 48x96x>^-in. sheets, were used,from which to shovel the material. Thesewere placed in position 3 or 4 ft. back fromthe breast by the trammer just before goingoff shift. The ground broke fine enough torequire little or no sledging. A cubic foot ofbreccia in place will average 154 lbs. in weightas compared with 90 lbs. on the muck-pile, giv-ing an average of 42 per cent, of void the waste was trammed to the shaft 800 , and hoisted to the surface. No timberwas used in either heading. The following summary of the results ob-tained by using both large and small machineshas been prepared from the data given inTables I and II. Labor is the largest indiv-idual item. The wages of machine men were$4 per shift, and the addition of the itemsgiven under the several heads of Table I shows the entire cost of the material, as laid downat the station for the machine
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
