Bulletin . g mixed with the ore, is believed to be shght, if any. DISPOSAL OF TAILINGS. Usually throughout the region the tailings from the miUs arepiled near the mills by means of elevators and launders. As a pileof failings increases in height the tailings from the launder are directedinto the boot of another elevator and raised again as shown in PlateXV, A. Other means have been tried, such as belt conveyors andtrams, but elevators seem to find favor among most of the operators. Except for a few of the older and richer piles, the tailings are rarelyretreated. This is especially true of taih
Bulletin . g mixed with the ore, is believed to be shght, if any. DISPOSAL OF TAILINGS. Usually throughout the region the tailings from the miUs arepiled near the mills by means of elevators and launders. As a pileof failings increases in height the tailings from the launder are directedinto the boot of another elevator and raised again as shown in PlateXV, A. Other means have been tried, such as belt conveyors andtrams, but elevators seem to find favor among most of the operators. Except for a few of the older and richer piles, the tailings are rarelyretreated. This is especially true of taihngs from the sheet-groundmines where the lead and zinc content of the ore is relatively piles of any considerable size are, as a rule, purchased by theraihoads for use as road ballast. The taihngs are usually loaded bymeans of steam shovels, as shown in Plate XVI, or the taihngs fromthe mill may be permitted to flow directly through launders intoraihoad cars. BUREAU OF MINES BULLETIN 154 PLATE XV. A. METHOD OF DISPOSING OF TAILINGS.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
