. Transactions. • f- .:/ - ? ^n-mmrm^^txnmi^.-^r^-x .-^,. ? Jl Mining in the Ross land District. 465 two other compartments, the fifth compartment being the ladder long, cages with three decks will be used. One of these isshown in a photo. It is lying outside the entrance to the Black Beartunnel, prior to being mounted in shaft. Separate engines are used for. Uld .Surlace Works Ccntie Star. the ore and man ski[)s. Ihe hoisting signals are a combination of pullrope and electric bell. In most of the large mines there is a telephone connection at eachlevel with the surfa
. Transactions. • f- .:/ - ? ^n-mmrm^^txnmi^.-^r^-x .-^,. ? Jl Mining in the Ross land District. 465 two other compartments, the fifth compartment being the ladder long, cages with three decks will be used. One of these isshown in a photo. It is lying outside the entrance to the Black Beartunnel, prior to being mounted in shaft. Separate engines are used for. Uld .Surlace Works Ccntie Star. the ore and man ski[)s. Ihe hoisting signals are a combination of pullrope and electric bell. In most of the large mines there is a telephone connection at eachlevel with the surface. This is found to be a very great convenience. VKN ihis is chiefly natural. In long drifts ventilation is produced bymeans of a Root blower. This is on the surface, is usually worked bya motor and blows a positive current down a main set in the ladder-way of the shaft. This main is round, of galvanized steel, and isriveted and soldered with telescopic joints branches of smaller pipingare taken off at each level wheie necessary and led into the 466 The Canadian Mifiing Institute. PUMPING. As yet the water encountered in most of the mines is the Centre Star the water which accumulates on the 200 level is runout of the tunnel on this level. The water of the 300 and 400 levelsruns into the sump on the 500 level, and from there an over
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
