. The Yukon Territory, its history and resources . from the blow-offof the boilers; in loose gravels the steam alone is used. Anothereconomical method used for thawing gravels in drifting opera-tions is what is called the hot water method. This is especiallyused where the gravels are hard. A description of the methodis as follows:— A sump-hole is made at the bottom of the shaft, and asmall duplex pump is set up, to which is attached a small fire-hose with a two-inch discharge, and as the water is pumpedagainst the face of the drift it is returned to the sump-hole,leaving the gravels thawed on
. The Yukon Territory, its history and resources . from the blow-offof the boilers; in loose gravels the steam alone is used. Anothereconomical method used for thawing gravels in drifting opera-tions is what is called the hot water method. This is especiallyused where the gravels are hard. A description of the methodis as follows:— A sump-hole is made at the bottom of the shaft, and asmall duplex pump is set up, to which is attached a small fire-hose with a two-inch discharge, and as the water is pumpedagainst the face of the drift it is returned to the sump-hole,leaving the gravels thawed on the drift. This water is pumpedover and over again on the face of the drift. to Open-cut Method. On all claims Mhcre the depth of bed-rock is less thanfifteen feet it lias boon found that the ground can be operatedmore economically by what is known as the open-cut method has been used very largely on Bonanza andEldorado creeks. At first the surface of llic ground is removedby what is lonncd ground-sluicing, the water from the stream. in s o SO CD> O o 01 P5 ?5 41^ MINING 39 is diverted into small ditches, and incii wiili picks and shovelsremove the material into running water, which is carried this means all the muck or surface material is graduallycarried away until nothing is left but the gravel containingthe gold. The sluice-boxes are then set up, and the gold-bear-ing gravel is shovelled in. The mining methods to which reference has been madeare the chief methods whereby placer mining is carried on inthe territory under the term of ordinary placer mining. GRAVELS OF THE KLONDIKE GOLD-FIELDS. A section across the valley of any of the gold-bearingstreams entering the Klondike shows a comparatively narrowtrough-like depression below, from 150 to 300 feet deep,bordered on one or both sides by wide benches beyond whichthe surface rises in easy, fairly regular slopes up to the crestsof the intervening ridges. The benches represent fragmentsof older valley
Size: 1246px × 2006px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcanadadeptoftheinteri, bookcentury1900, bookdecade1900
