Transactions . ver, suffers more or lessfrom blasting and in course of time is replaced if necessary. Ifconvenient, heavy railroad iron covered with lagging may be usedinstead of a wooden cap. Chutes have been built-lined with tankplates, and the inside timbers armour-plated. This, however, isseldom done as the life of an ordinary chute is usually long enoughto handle all the ore from that part of the stope of which it is theoutlet. The chute gate is a solid piece of sheet iron, and is oper-ated by a lever. It is shown in section in the drawing of a case a car is loaded and the gate i
Transactions . ver, suffers more or lessfrom blasting and in course of time is replaced if necessary. Ifconvenient, heavy railroad iron covered with lagging may be usedinstead of a wooden cap. Chutes have been built-lined with tankplates, and the inside timbers armour-plated. This, however, isseldom done as the life of an ordinary chute is usually long enoughto handle all the ore from that part of the stope of which it is theoutlet. The chute gate is a solid piece of sheet iron, and is oper-ated by a lever. It is shown in section in the drawing of a case a car is loaded and the gate is prevented from closing by alarge rock, a plank or two is moved along the staging against themouth of the chute thus preventing any loose rock from runningover. Tunnel sets are rarely needed. The main haulage way onthe 400 ft. level, a straight run of about 1,000 feet, has no timbersother than those necessary to carry the electric light and trolleywires. This is the usual experience. In No. 3 Tunnel there is a.
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
