Canadian mining journal July-December 1915 . a cubic yard, with wages at six dollars a day, and dry spruce wood for fuel at tendollars a cord. Since, with this plant and in a pro-perly conducted mine, about two-thirds of the menemployed are working underground with pick andshovel, it is not likely that this cost can be greatlyreduced while wages remain at their present rate. Improvements Above Ground.—The modifications ofthe methods of open cutting and ground-sluicingadopted in 1897 and 1898 have been usually on well-known engineering lines, and have not exhibited thesame originality as has be
Canadian mining journal July-December 1915 . a cubic yard, with wages at six dollars a day, and dry spruce wood for fuel at tendollars a cord. Since, with this plant and in a pro-perly conducted mine, about two-thirds of the menemployed are working underground with pick andshovel, it is not likely that this cost can be greatlyreduced while wages remain at their present rate. Improvements Above Ground.—The modifications ofthe methods of open cutting and ground-sluicingadopted in 1897 and 1898 have been usually on well-known engineering lines, and have not exhibited thesame originality as has been shown in the improve-ments of the underground mining methods. The gen-eral practice is still to pick the muck down into thestream and then to allow the water to carry it the muck has been removed and the frost hasbeen drawn out of the gravel by the warm air of oneor two summers, the barren upper gravels are usuallyremoved, either with shovels and wheelbarrows. hor>«-scrapers, or steam-scrapers, .and piled into Sluice from Tyrrells hydraulic mine on theBonanza creek benches After the barren gravel has been removed the pay-dirt is either shoveled into sluice-boxes set in the b t-tom of the cut, the water used being afterwards raidedby a centrifugal pump to the general surface level; orthe sluice-boxes are set over the cut. and the pay-dirtis shoveled, usually in two stages, into them: or thesluice-boxes are set above and to one side of the the pay-dirt is wheeled to a bucket which is hoist -ed in some way. preferably by a Dawson carrier,and emptied into the sluice-boxes. In mining the gravel on the terraces or benches, highabove the level of the streams, the early miners wereusually at the disadvantage of having no water im-mediately available, so that the pan and rocker werethe only washing plants that could be used, and waterfor these had often to be carried up a height of severalhundred feet in pails. The owner of one of the richerof the
Size: 1838px × 1359px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
