and engineering journal . ear, and ^lessrs. R. , James Gray, H. A. White and J. A. WiUiamsonVice-Presidents. » * * * The well-known firm of Messrs. Harvey & Russell, Ltd.,mining machinery merchants, are removing to larger andmore commodious offices at the end of the present and after the 1st July the new address of the firm willbe 50-52, Central House, Simmonds Street, and the newtelephone number will be 4004. Notice is given in the Governmcni Gazette, under Sec-tion 59 of Ordinance No. 4 of 1904 (Orange River Colony),that the Government of the Union of South Africa h
and engineering journal . ear, and ^lessrs. R. , James Gray, H. A. White and J. A. WiUiamsonVice-Presidents. » * * * The well-known firm of Messrs. Harvey & Russell, Ltd.,mining machinery merchants, are removing to larger andmore commodious offices at the end of the present and after the 1st July the new address of the firm willbe 50-52, Central House, Simmonds Street, and the newtelephone number will be 4004. Notice is given in the Governmcni Gazette, under Sec-tion 59 of Ordinance No. 4 of 1904 (Orange River Colony),that the Government of the Union of South Africa has leasedto the Crown Diamond Mining and Exploration Company,Ltd., certain 116 claims in the mine now known as theCrown Diamond Mine (formerly known as the Lace DiamondMine), situated on the farm Ruby No. 691, in the districtof Kroonstad, Province of the Orange Free State, whichclaims were abandoned bv tlu siil Crown Diamond Miningand Compativ. T, ithon being the claimholderof the said claims), in August, THE SOUTH AFEICAN MINING JOURNAL. Johannesburg, Juno 26, 1915. REFINING GOLD * An Authoritative Review of a Subject of Interest on the Rand. [By Sir Thomas Kirke Rose.] Deposiiion of Gold at Cathodes.—It is recommended byWohlwill that the proportion of gold present as chloride inthe bath should be 2| per cent, to 3 per cent., and strengthsof 3 per cent, to 7 per cent, are in use in America. The rateof deposition, however, may be increased if stronger solu-tions are used. It is generally considered desirable that thecathode deposit should be coherent to enable it to be washedreadily. At Ottawa, according to Entwistle, the deposit ofgold on the cathode at 500 amperes per sq. m. of surface isa black slime in cold solutions containing 5 per cent, ofgold, a yellow-coloured coherent sheet at 50 deg. atthe same current density. In the United States Mints acurrent density of 1,000 amperes in a cold solution with 7per cent, of gold appears to
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectmineralindustries
