E/MJ : engineering and mining journal . breathin In fact Dr. Flaldane made tin ratns had cerl ts, which ra tied, it was tl Dr. is said tohow much he exerted hin ply him with the Iarticle rea -eral. declared thatexpended must be made •oxygen 1In make a man wi mem1 S ward will have !•• 980 ENGINEERING AND MINING JOURNAL Vol. 102, No. 23 D< )ffia< alllllllllllllllllll By Akthue C. Daman* Considering the high cost and comparatively short lifeoi the domestic crucibles used in refining gold and silverprecipitates, it is advantageous to take all precautions inlengthening their life. We
E/MJ : engineering and mining journal . breathin In fact Dr. Flaldane made tin ratns had cerl ts, which ra tied, it was tl Dr. is said tohow much he exerted hin ply him with the Iarticle rea -eral. declared thatexpended must be made •oxygen 1In make a man wi mem1 S ward will have !•• 980 ENGINEERING AND MINING JOURNAL Vol. 102, No. 23 D< )ffia< alllllllllllllllllll By Akthue C. Daman* Considering the high cost and comparatively short lifeoi the domestic crucibles used in refining gold and silverprecipitates, it is advantageous to take all precautions inlengthening their life. We have inside and outside corro-sion, cracking and other troubles. The least expensiveand probably greatesl life extender for crucibles is properseasoning, especialy when they have become damp intransit or storage. At the Commonwealth Mines, Pearce, Ariz., a woodenchest, with steam coils covered with sand, is used. Thechest holds four crucibles, and by the time required, theyare thoroughly seasoned. Since using this chest the life. Boiler for Hill HeatingTWO FORMS OF CRUCIBLE-SEASONING CHAMBERS of a crucible has been increased from in to 25% which,considering the initial cost (between $50 and $60),amounts to quite a saving. At the Churchill Milling mill. Wonder, New, asheet-iron seasoning box is placed above the mill heatingboiler. As shown by the sketch, the top and front sidesopen on hinges, and the crucibles are lifted out by meansof chain blocks. The Nevada Hills Mining Co. at Eairview, keep-two or three crucibles in the bullion vault and inside ofeach is placed a 110-volt electric-heating element. Thislatter method is successful, though it takes a considerablylonger time to season and costs IS In the modem Australian mill the rock breakers shouldbe made to play a more important part in ore reductionthan is the case at present. Not enough attention is paidto this department in the ordinary mill, and as a conse-ouence, the duty per stamp in many Austra
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
