E/MJ : engineering and mining journal . l accidents. As a means of 622 Engineering and Mining Journal Vol. 108, No. 15 overcoming injurj from these sources and at the sametime increasing the efficiency in dumping directly intoskips (in the absence of skip chutes or ore pockets)a scheme was devised at the Berkeley mine of the Ana-conda Copper Mining Co., of Butte, Montana. The ground in front of each hoisting compartmentof the shaft was removed as shown in Fig. 1 and islined on the sides and bottom with sheet iron, makinga slide or chute with an opening into the shaft 20 in. A Straightener or B
E/MJ : engineering and mining journal . l accidents. As a means of 622 Engineering and Mining Journal Vol. 108, No. 15 overcoming injurj from these sources and at the sametime increasing the efficiency in dumping directly intoskips (in the absence of skip chutes or ore pockets)a scheme was devised at the Berkeley mine of the Ana-conda Copper Mining Co., of Butte, Montana. The ground in front of each hoisting compartmentof the shaft was removed as shown in Fig. 1 and islined on the sides and bottom with sheet iron, makinga slide or chute with an opening into the shaft 20 in. A Straightener or Bent PipePipes that have been laid through crooked drifts andup crooked raises are usually badly bent, and theirmuch of the equipment is recovered from parts of themine that have been worked out, an assortment of piperemoval further bending, and to this is addedthe falls of ground and shooting on thf; pipes. At mostmines where development is progressinij rapidly and SheetDoor Track onLeve/. HoistingCoffipariinen P A ^ FIG. I \. Il^AN AND AKRAlTCiEMENT OF SAFETY DEVICE FOR DUMIING ORE INTO SKIPS deep and 19 in. wide. Sheet-iron doors, as shown inFig. 2, cover the openings on the station floor when notin use. The doors when closed will not interfere withthe caging of waste or handling of supplies on thestation. In order to provide a dump or stop for thecars as they are being emptied, the device shown inFig. 3 was made, and this prevents the car from push-ing ahead and holds it stationary while it is beingdumped. After the skip has been filled, the stop isturned over and folded into the slide or chute, a partof it serving as a support for the door when it isclosed. This method protects the station tenders fromdanger, as their work is done at a safe distance fromthe shaft, and all station doors are closed. By the useof the old method it was necessary to re-spot theskip after three cars were dumped, on account of thestretching of the rope. The skip can now be filledwithout
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
