A glossary of mining and metallurgical terms

Recommendations

Info

4 A GLOSSARY OF MINING AND METAL.LURGICAL TERXfS. found in Greenland ; oxide and silica. bauxite, a hydrous compound of alumina, ferric Amalgamation. 1. The production of an amalgam or alloy of mercury. 2. The process in which gold and silver are extracted from pulverized ores by producing an amalgam, from which the mercury is afterwards expelled. See Retorting. Amalgamator. 1. A machine for amalgamating ores. 2. The workmen in charge of such a machine. American forge. See Catalan forge. Anemomete)'. An instrument for measuring the rapidity of an air- current. Annealing. 1. The gradual cooling of glass or metal from a high temperature, to render it less brittle. 2. See Malleable castings. Anthracite. See Coal. Anticlinal. The line of a crest, above or under ground, on the two sides of which the strata dip in opposite directions. The con- verse of .synclinal. Antimony ores. Native antimony ; .^tibnite (sulphide of antimony) valentinite and senarmontite (oxides). Apex. In the U.S. Revenue Statutes, the end or edge of a vein nearest the surface. Apolvillados, Sp. Ores superior in quality to the azogues. Appall oven. An oven for the manufacture of coke, differing from the Belgian in that it is divided into vertical compartments. Aprons. See Copper-plates. Arch, Corn. 1. A portion of a lode left standing when the rest is extracted, to support the hanging wall or because it is too poor for profitable extraction. 2. The roof of a reverberatory furnace. Arenaceous. Silicious or sandy (of rocks). Arends' tap. An arrangement bv which the molten lead from the crucible of a shaft-furnace is drawn through an " inverted siphon " into an exterior basin, from which it can be ladled without disturb- ing the furnace. Arenillos, Sp. Refuse earth. Argentiferous. Containing silver. Argillaceous. Containing clay. Arm. The inclined member or leg of a set or frame of timber. Arrastre, Sp. Apparatus for grinding and mixing ores by means of a heavy stone dragged around upon a circular bed. The arrastre is chietly used for ores containing free gold, and amalgamation is
A GLOSSARY OF ^fIMNO AND MFTAT,T,UROICAL TERMS. 5 combined with the grinding;. Sometimes incorrectly written arraster, arrastra, or raster. Arroha, Sp. Twenty-five ponnd avoirdupois. Arsem'n ores. Kative arsenic ; mispickel. [arsenopyrife, arsenical Pyrites, arseno-sulphide of iron). Ascension-theory. The tlieory that the matter filling fissure- veins was introduced in solution from below. Ash-pit. The receptacle for ashes under a fire-place. Assay. To test ores and minerals by chemical or blowpijie ex- amination ; said to be in the dry way when done by means of heat (as in a crucible), and in the wet or humid way when by means of solution and precipitation or liquid tests. An assay differs from a complete analysis in being confined to the determination of certain ingredients, tiie rest not being determined. Both assays and analyses may be either qualitative or quantitative ; that is, they may determine the presence merely, or also the amount, of some or all of the con- stituents of the substance examined. The assay value of gold and silver ores is usually determined in Troy ounces (or, for gold, penny- weights) per ton (2000 pounds avoirdupois) of ore. See Assay ton. When reported in money value, the ounce of gold is taken at $20.6718. A ton of pure gold would be worth §602,928.51 ; the value of $6 per ton would be by weight one-thousandth percent., and so on. Silver varies greatly in market value; but assayers often report their results according to the old U.S. standard, which made the ounce of pure silver worth §1.2929. The ton of silver at this rate, would be worth §37,710.40 ; the value of §37 per ton would be by weight one-tenth per cent., and so on. For ordinary gold and silver ores, it is evident that the percentages would be inconveniently small as expressions of value. Assays of lead, copper, iron, etc., are rej)orted in percentages. Assay-ton. A weight of 29.166f grams. Since one ton of 2000 pounds avoirdupois contains 29.166| troy ounces, it is evident that each milligram of gold or silver obtained from one assay-ton of ore represents one ounce troy to the ton of 2000 pounds avoirdupois. A.^sessment-toork, Pac. The work done annually on a mining claim to maintain possessory title. Astel. Overhead boarding or arching in a gallery. Astyllen, Eng. A small dam in an adit or level, to check water. Atierres, Sp. Refuse ores. Attle, Corn. Refuse rock. Auger-nose shell. See Wimble.
Page 1 and 2: CO LO CD OO CD 1
Page 7: -^ GLOSSARY OF mine m muiPtCicii i
Page 10 and 11: 2 A GLOSSARY OF MINING AND METALLUR
Page 18 and 19: 10 A GLOSSARY OF MINING AND METALLU
Page 22 and 23: 14 A GLOSSARY OF MINING AND Af ETAL
Page 28 and 29: 20, A GLOSSARY OF MIXING AND METALL
Page 34 and 35: 26 A GLOSSARY OF MIXING AND METALLU
Page 40 and 41: 32 A GLOSSARY OF MINING AND METALLn
Page 44 and 45: 3G A GLOSSARY OF MINING AND METALLU
Page 46 and 47: P>S A GLOSSARY OF MINING AND METALL
Page 50 and 51: 42 A GLOSSARY OF MINING AND METALI>
Page 52 and 53: 44 A GLOSSARY OF xMINING AND METALL
Page 54 and 55: 46 A GI.OSSARY OF MINTNO AND METALL
Page 58 and 59: 50 A GLOSSARY OF MININTG AND METALL
Page 62 and 63:
54 A GLOSSARY OF MINING AND METALLU
Page 64 and 65:
56 A GLOSSARY OF MINrXG AND METALLU
Page 66 and 67:
Page 68 and 69:
GO A GLOSSARY OF MINING AND METAI.I
Page 70 and 71:
62 A GLOSSARY OF MIXING AND METALLU
Page 72 and 73:
Page 74 and 75:
66 A GLOSSARY OF >rTNTNG ANP METALL
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
86 A GLOSSARY OF MIXING AND METALLO
Page 96 and 97:
Page 98 and 99:
90 A GLOSSARY OF IMIXING AND JklETA
Page 100 and 101:
Page 102:
show all

A glossary of mining and metallurgical terms

Create successful ePaper yourself

Delete template?

Save as template?