and engineering journal . Headgears and Coal Screening Plants. MAKERS OF Headgears Headgear Sheaves Cages Kep Gears Stephen Humble Friction Driven Tipplers Jigging Screens Marcvs Screens and Con-veyors, etc., MAKERS OF Plate Picking BeltsDeflecting JibsRaising and Lowering GearsScraper ConveyersBar Picking BeltsElevatorsCreepersRotary ScreensBand Conveyors, etc., etc. COAL WASHING PLANTS. DESIGNS PREPARED AND ESTIMATES SUBMITTED BY UU I Head, Wrightson & Co., (South Africa) Ltd., | 47-48, Standard Bank Chambers, Johannesburg. Jbure, September 17 L921 THE MININ
and engineering journal . Headgears and Coal Screening Plants. MAKERS OF Headgears Headgear Sheaves Cages Kep Gears Stephen Humble Friction Driven Tipplers Jigging Screens Marcvs Screens and Con-veyors, etc., MAKERS OF Plate Picking BeltsDeflecting JibsRaising and Lowering GearsScraper ConveyersBar Picking BeltsElevatorsCreepersRotary ScreensBand Conveyors, etc., etc. COAL WASHING PLANTS. DESIGNS PREPARED AND ESTIMATES SUBMITTED BY UU I Head, Wrightson & Co., (South Africa) Ltd., | 47-48, Standard Bank Chambers, Johannesburg. Jbure, September 17 L921 THE MINING AND ENGINE] RING JOURNAL. Principles of Gold Refining. The completion ol the Gold Refinery at Germistonlends interest to the following brief review of theprinciples of gold refining, with special reference to theprocess in vogue at the London, Sydney, and the oldPretoria Mints. The gold produced from mines in general is associatedwith a greater or smaller amounl < I impurities. Theseimpurities are usuallj presenl on account of their existencein the ore from which the gold has been produced, bul thejare also included in the gold from external sources duringthe course of«extraction. They usuallj consist of the preciousmet
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
