A glossary of mining and metallurgical terms

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58 A GLOSSARY OF MINING AND METALLURGICAL TERMS. Mill-run, Pac. 1. The work of an amalgamating mill between two clean-ups. 2. A test of a given quantity of ore by actual treatment in a mill. Mine. 1. In general, any excavation for minerals. More strictly, subterranean workings, as distinguished from quarries, placer and hydravlic mines, and surface or open works. The distinction between the French terms mine and miniere results entirely from the law, and depends upon the dej^th of the working. The former is the more general term, and, ordinarily speaking, includes the latter, which signifies shallow or surface workings. 2, In a military sense, a mine is a subterranean gallery run under an enemy's works, to be subse- quently exploded. Mine-pig, Eng. See Pig-iron. Miner, Penn. The workman who ads the coal, as distinguished from the laborer who loads the wagons, etc. Mineral. In miners' parlance, ore. Mineral caoutchouc. Elastic bitumen. Mineral charcoal. A pulverulent, lustreless substance, showing distinct vegetable structure, and containing a high percentage of carbon with little hydrogen and oxygen, occurring in thin layers in bitu- minous coal. Mineralized. Charged or impregnated with metalliferous mineral. Mineral oil or Naphtha. A limpid or yellowish liquid, lighter than water, and consisting of hydrocarbons. Petroleum is heavier than naphtha, and dark greenish in color when crude. Both exude from the rocks; but naphtha can be distilled from petroleum. Mineral pitch. Asphaltum. Mineral right. The ownership of the minerals under a given surface, with the right to enter thereon, mine, and remove them. It may be separated from the surfiice ownershi[), but, if not so separated by distinct conveyance, the latter includes it. Mineral wool. See Slag-wool. Mine-rerd. The rent or royalty paid to the owner of a mineral right by the operator of the mine—usually dependent, above a fixed minimum, upon the quantity of product. Mineria, Sp. Mining. This term embraces the whole subject, including both mines and miners, and also the operations of working mines and of reducing their ores. It, however, is often used in a more restricted sense. Muiero, Sp. Miner. This term is not limited to those who work mines, but includes their owners, and all who have the qualifications
A GLOSSARY OF MINING AND METALLURGICAL TERMS. 59 prescribed in the oiTiinances, and are enrolled as members of the body or craft. Many of the laborers who work in mines are not, technically speaking, miners. This term is sometimes used in the old laws for mine. Miners^ inch, Pac. A local unit for the measurement of water supplied to hydraulic miners. It is the amount of water flowing under a certain head through one square inch of the total section of a certain opening, for a certain number of hours daily. All these couditions vary at ditferent localities. At Smartsvillc, Cal., the discharge opening is a horizontal slit, 4 inches wide, in a 2-inch plank, with the standing head of water in the feed-box 9 inches above the middle of the slit. Each square inch of this opening will discharge 1.76 cubic feet per miuutc. A miners' inch in use in Eldorado County, Cal., discharges 1.39 cubic feet per minute. At North Bloomfield, Cal., and other places, the discharge is 50 inches long by 2 wide (giving 100 miners' inches) through a 3-inch plank, with the water 7 inches above the centre of the opening. Each inch is' 1.50 to 1.57 cubic feet per minute in practice, or 59.05 to 61.6 per cent, of the theoretical discharge. These figures are taken from the paper of A. J. Bowie, Jr., on " Hydraulic Mining in California," Trans. Am. Inst. 31. E., vol. vi, p. 59. Jllinda, Sp. A little mine ; a chamber, or cavity. Minium. Protosesquioxide of lead. Mispickd, Germ. Arsenical pyrites. Mi.^tresn, Xem'c. A lantern used in coal-mines. Mohby, S. Staff. A leathern girdle, with small chain attached, used by the boys who draw bowlces. Mock-lead, Corn. Zincblende. Moil or Moyle, Corn. A drill pointed like a gad. Monkey-drift. A small prospecting drift. Monitor, Pac. A kind of nozzle used in hydraulickinrj Monnier process. The treatment of copper sulphide ores by roast- ing with sodium sulphate, and subsequent lixiviation and precipi- tation. MonocUnal. Applied to any limited j)ortion of the earth's crust throughout which the strata dip in the same direction. Montefiore furnace. A peculiar furnace in which zinc-dust is com- pressed at a high temperature. Moorstone, Corn. Loose masses of granite found on Cornish moors.
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A glossary of mining and metallurgical terms

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