. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . to a flat car by means of alocomotive crane. This is illustrated in Fig. 17 at the NevadaConsolidated Copper Company. To do this, three chains ofproper length are attached to the drill, one just above the frontaxle and the other two to the two rear wheels. The mast is notlowered nor are the tools taken off the machine; the fire is notdrawn nor is the boiler blown out. A barrel of water is put on the 96 STEAM SHOVEL MINING bed of the drill and all other equipment is loaded on the
. Steam shovel mining, including a consideration of electric shovels and other power excavators in open-pit mining . to a flat car by means of alocomotive crane. This is illustrated in Fig. 17 at the NevadaConsolidated Copper Company. To do this, three chains ofproper length are attached to the drill, one just above the frontaxle and the other two to the two rear wheels. The mast is notlowered nor are the tools taken off the machine; the fire is notdrawn nor is the boiler blown out. A barrel of water is put on the 96 STEAM SHOVEL MINING bed of the drill and all other equipment is loaded on the flat the drill is unloaded it moves to its new spot and beginsdrilling. The barrel of water serves until the necessary waterconnections are made. This method obviates preparing a road; requires but 3 menon the crane beside the drill crew, instead of at least 10 men onroads and moving; causes no delays or damage on haulagetracks passed over or along; and relieves the drill of most ofthe wear and tear of moving. When it*is necessary to move adrill on its own power, the tools are tied beneath the rig and. Fig. 17.—Moving drill with loconiotivo crane. dragged along the ground; a barrel of water is put on the bed ofthe machine and the remainder of the equipment is carted alongon a push car or by teams. These drills carry a working steam pressure of 100 lb. persq. in. They consume per shift about 600 lb. of coal, twelve50-gallon barrels of water (for boiler and drill hole); l^^^ pintsof cylinder oil; 1 pint dark lubricating oil; ^.^ lb. cup grease; 3^^gallon of gasoline for night lighting; and }^ lb. cotton waste. With hard mining usage they require many renewals and MECHANICAL EQUIPMENT 97 repairs but l)y a little careful study the weaker parts can bestrengthened by increasing their size or changing the are made in the field until the drill loses its efficiency,when it is taken to a shop, entirely dismantled, examined andrebuilt. The footage drilled and
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