Canadian mining journal July-December 1915 . of less value than fifteenor twenty dollars a cubic yard. After the narrow belts of rich and shallow groundalong the edges of the benches or terraces had thusbeen shoveled off. and the gold extracted from themin rockers, the miners began to run adits into the hills,along the bottom of the gravel on top of bed-rock. andto bring out the pay-dirt to the rim* to be washed in November 1, 1915. THE CANADIAN MINING JOURNAL rockers. But this process of milling and hand-washingproved entirely too slow and expensive. Consequentlythe pay-dirt was rained and br
Canadian mining journal July-December 1915 . of less value than fifteenor twenty dollars a cubic yard. After the narrow belts of rich and shallow groundalong the edges of the benches or terraces had thusbeen shoveled off. and the gold extracted from themin rockers, the miners began to run adits into the hills,along the bottom of the gravel on top of bed-rock. andto bring out the pay-dirt to the rim* to be washed in November 1, 1915. THE CANADIAN MINING JOURNAL rockers. But this process of milling and hand-washingproved entirely too slow and expensive. Consequentlythe pay-dirt was rained and brought out to the mouthsof the adits, where it was piled up for a time, andwas then either run down the hill in a chute to a sluiceset near the creek, and supplied with water from it;or, if it was impossible to dump tailings on the creekclaim, a pump was installed and water was pumpedup the hill and allowed to run down again through thesluice-boxes, being often used two or three times overby different parties in its descent. At a later date. A winter scene in valley of Klondike river, near Dawson ditches, sometimes several miles in length, were dugto bring water from tributary streams at a sufficientlyhigh elevation to enable the miners to wash thesedumps of pay-dirt. The methods of mining adopted on these terraces,or so-called hillside claims, were for the most parteery similar iii character to those used in undergroundmilling in the creek claims. An adit was run along thetop of tin- bed rock to the rear boundary of the claim,or as far as pay-gravel could be found, and drifts weredriven at regular intervals at right angles to it. Theintermediate pillars were then taken out, a certainamount of timbering being usually necessary to sup-port the roof while the pay-gravel from these pillarswas being recovered. In most of these mines theground was frozen and had to be thawed with steam-points; but in some cases, generally where tin- overburden of barren gravel was more than two hundr
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
