new icn messageflickr-free-ic3d pan white
Image from page 484 of "S.A. mining and engineering journal" (1891) | by Internet Archive Book Images
Back to photostream

Image from page 484 of "S.A. mining and engineering journal" (1891)

Identifier: p2saminingengine32joha

Title: S.A. mining and engineering journal

Year: 1891 (1890s)


Subjects: Mineral industries Mining industry and finance Mines and mineral resources

Publisher: Johannesburg

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto



View Book Page: Book Viewer

About This Book: Catalog Entry

View All Images: All Images From Book


Click here to view book online to see this illustration in context in a browseable online version of this book.



Text Appearing Before Image:

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


Text Appearing After Image:

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



Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

0 faves