Image from page 484 of "S.A. mining and engineering journal" (1891)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto
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g Ileus, ar<ateh, weighed (weight after melting) and samples takenthe Assaj Office. In the < ase i I depi sits the assaj i i whichis satisfactory, the bullion is sent to the Gold Refinerj atconvenient tunes. When the assay is unsatisfactory, i iwhen the bullion contains base metals which renderthe assajresults unreliable, the bullion is returned to the Touch Gold.Melting House for a preliminary refining (toughening) withair, chlorine, nitre, etc., to remove base metals which produceunevenness in samples. After this treatment the bullionis again weighed in the balance room and another -samples is taken for the Assay Office Gold Refining Branch. After the weight and assay have been determined, thebullion is forwarded to the Gold Refinery. Here it is made upinto lots of about 700 ounces each. Each lot is melted in a4-pint (day crucible, which stands in a plumbago guardcrucible, using borax as a flux. When the bullion is melteda (day pipe stem is introduced into the molten metal and
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The Rand Refinery at Germiston. Store Rooms, Coke Bins, Coal Bunkers, Switch and Trans-former House, Garage and Police Guard Rooms, all of whichare enclosed by a boundary wall covering an extent over 5acres of ground. Refinery Office. The bullion received is weighed in the presence of thedepositor, the numbers and marks on the ingots are noted,a refinery number is given to the deposit, a receipt showingweight aiid refinery number is handed to the depositor, and aticket showing weight and refinery number is placed with the gold, Which is sent to the Lough Cold Melting House. Rough Gold Melting House. The bullion is check weighed, marks and description ofingots in each lot noted. Each lot of bullion is melted in aplumbago crucible with suitable tluxes; after melting bullionis cast into slipper ingots, deposit number stamped oneach ingot, ingots freed from slag, etc. The crucible usedin melting scraped, flux and scrapings crushed and pannedoff. The scrap gold so obtained is called the en
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