. Transactions. ring, mediums a. i^. inch ring, and coarse a 4 inch coarse fall on bumping tables from which the ore and gangue ispartially separated by hand-picking. The ore may now either besmelted green, that is, without roasting, or it goes to the roast heaps,where it burns for from two to six months, thus oxidizing the sulphur,which is reduced in this way from about 24 per cent, or thereaboutsto 2^ to 8 per cent. An average sample of the roast ore gave : Copper per cent. Nickel Sulphur Iron And the rest gangue. Each heap contains from one thousand to four tho
. Transactions. ring, mediums a. i^. inch ring, and coarse a 4 inch coarse fall on bumping tables from which the ore and gangue ispartially separated by hand-picking. The ore may now either besmelted green, that is, without roasting, or it goes to the roast heaps,where it burns for from two to six months, thus oxidizing the sulphur,which is reduced in this way from about 24 per cent, or thereaboutsto 2^ to 8 per cent. An average sample of the roast ore gave : Copper per cent. Nickel Sulphur Iron And the rest gangue. Each heap contains from one thousand to four thousand tons ofore, the average being about two thousand tons, and they burn fromtwo to six months, the time depending on their size. The place selectedfor the piles is first covered with fine ore distributed evenly over theclay soil, the ground around being well drained to prevent as far aspossible the leaching out of the nickel and copper sulphates, then a ( i The Stilphide Ore Bodies of the Sudbury Region. 545. 35 546 The Canadian Mining Institute. foundation of cordwood, stamps, etc., through which are arrangedcanals filled with kindling wood communicating to chimneys for thesupply of draught. Then the interstices are filled up with small woodand chips, over which is laid the coarsest class of ore, then the med-iums, next a layer of rotten wood or chips, then a layer of regularraggings and over all a layer of fines and flue dust. When sufficientiof the sulphur is oxidized they are blasted up and the ore is sent to thesmelter. There are two smelters now at Copper Cliff with thirteen furnacesin all. The furnaces are water-jacketed and belong to the Herreshofftype, each having a capacity of a hundred and twenty-five tons pertwenty-four hours. They are each supplied with a circular well,mounted on wheels which rest on a track so that the well may beeasily pulled away in case of a freeze up or when the furnace is to betapped out. The well serves as a setthng chamber in which the s
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
