A glossary of mining and metallurgical terms

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56 A GLOSSARY OF MINrXG AND METALLURGICAL TERMS. 3IaUet, Corn. The sledge-hammer used for striking or healing the borer. Mandril. See 3Iaundril. 31anganese-oreii. Gray oxide (pyrolusite, polianite, a.nhy(\rous per- oxide, and manganite, hydrated sesquioxide) ; black manganese (hauts- mannite, protoperoxide) ; braunite (anhydrous sesquioxide); red manganese ore irhodochrosite, a carbonate, or rhodonite, a silicate) also, manganiferous iron ores. Man-hole, Corn. The hole in a sollar through which men pass upon the ladder or from one ladder to the next. 3Ian-machine or Man-engine, Corn and Derb. A mechanical lift for lowering and raising miners in a shaft by means of a recipro- cating vertical rod of heavy timber with platforms at intervals, or of two such rods, moving in opposite directions. In the former case, stationary platforms are placed in the shaft, so that the miner in descending, for instance, can step from the moving platform at the end of the down-stroke, and step back upon the next platform below at the beginning of the next down-stroke. When two rods are employed, the miner steps from the platform on one rod to that on the other. Man-of-war, Staff. A small pillar of coal left in a critical spot also, a principal support in thick coal workings. 3Ianta, Sp. Blanket ; sack of ore. Mantle. The outer wall and casing of an iron blast furnace, above the hearth. Manway. A small passage, used by workmen but not for trans- portation. 3Iaquilla, Sp. A mill where ore is ground on shares. 3Iarl. Calcareous clay, sometimes used for the hearths of cupel- ling-furnaces. 3Iartin process. Called also the Siemens-Martin and the open- hearth process. See Steel. 31ass-copper, Lake Sup. Native copper, occurring in large masses. 3Iassicot. See Litharge. Matrix. The rock or earthy material containing a mineral or metallic ore ; the gangue. 3Iatt, or 3Iatte, Fr. A mass consisting chiefly of metallic sulphides got in the fusion of ores. 3Iaal, Derb. A large hammer or mallet.
A GLOSSARY OF MINING AND METALLURGICAL TERMS. 57 Maundril, Derb. and S. Wales. A prying jiick with two pronos. Mear. Derb. Thirty-two yards of ground measured on the vein. Measures. Strata of coal, or the formation containing coal beds. Ment-earth. The vegetable mould. Meetings, 'Sewc. The place at middle-depth of a .s/zr//?, .s/oyjt, or plane, where ascending and descending cars pass each otiier, Merced, Sp. A gift. This term is applied ro a grant wliich is made without any valuable consideration. MercJund-iron. See Mid. Merchant-train. A train of rods for reducing iron jji/c.s or steel ingot.s; blooms, or bidet.^t to bars of any of the various round, square, flat, or other shapes, known as merchant iron or steel. Mercury-ores. IsTative mercury ; cinna6ar (sulphide). Merrit-plate. See Bloomary. Metal, Sp. 1. This term is applied both to the ore and to the metal extracted from it. It is sometimes used for vein, and even for a mine itself. Metal en piedra, ore in the rough state. Metal ordinario, common ore. Metal pepena, selected ore. Metal de ayuda, ore used to a&sist the smelting of other ores. 2. Copper regulus or matt obtained in the English process. The following varieties are distinguished by apj)earance and by their percentage of copper (here given in approxi- mate figures) : Coarse, 20 to 40 ; red, 48 ; blue, 60 ; sparkle, 74 ; irJiite, 77 ; pimple, 79. Fine metal includes the latter four varieties. Hard metal is impure copper containing a large amoujit of tin. 3. Scot. All the rocks met with in mining ore. 4. Road met(d, rock used in macadamizing roads. Metal-notch. See Tap-hole. Mica-powder. See Explosives. Mill. IjExG. That part of an iron works where puddk-bars -are converted into merchant-iron, i. e., rolled iron ready for sale in bars, rods, or sheets. See Forge. 2. By common usage, any establishment for reducing ores by other means than smelting. More strictly, a place or a machine in which ore or rock is crushed, 3. An excava- tion made in the country rock, by a cross-cut from the workings on a vein, to obtain waste for gobbing. It is left without timber so that the roof may fall in and furnish the required rock. 4. Corn. A passage through which ore is shot underground. See J\iss and Shoot. mill. Mill-cinder. The slag from the puddling-furnaces of a rolling- b
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A glossary of mining and metallurgical terms

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