Transactions, Volume 57American Institute of Mining, Metallurgical, and Petroleum Engineers, American Institute of Mining Engineers The Institute, 1918 - Metallurgy Some vols., 1920-1949, contain collections of papers according to subject. |
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Common terms and phrases
accidents air shaft amount anthophyllite anthracite apatite asbestos Assay average ball mill black damp blasting Bonne Terre burning cars cent chrysotile chrysotile veins coal committee concentrate Cone Conveyor cost cristobalite crocidolite cross-fiber crusher crushing crystals danger deposits desliming diameter discharge district Dorr tanks drill dump efficiency electric engineers excavation explosive feed fibers fibrous fire flotation foreman galena grade grinding Hancock jig handling hoisting hole hutch increase Joplin Lead Belt loaded machine Marathon mill material Mesh method middling minerals mining misfires obtained operation overburden overflow paper percentage phosphate rock plant possible powder practice pulp Pump pyrites quartz quartzite rolls safety lamp screen serpentine shot shot-firer shown Sieve silica silica brick slime solution specific gravity spigot steam shovel stripping surface tailing temperature tests thickness timber tion tonnage tons Total tridymite trommel undersize usually wires zinc
Popular passages
Page 187 - Intoxication or wilful failure or refusal to use a safety appliance or perform a duty required by statute...
Page 261 - Permanent total disability means the loss of both legs or both arms, or one leg and one arm, total loss of eyesight, paralysis or other condition permanently incapacitating the workman from performing any work at any gainful occupation.
Page 912 - On the occurrence of sulphur in marine muds and nodules, and its bearing on their mode of formation,
Page 245 - In every working approaching any place where there is likely to be an accumulation of explosive gas, no lamp or light other than a locked safety lamp shall be allowed or used...
Page 239 - Every cage or skip used for hoisting men must be provided with a safety catch of sufficient strength to hold the cage or skip with its maximum load at any point in the shaft in the event that the hoisting cable should break.
Page 59 - It is, therefore, concluded that the veins are crystallized portions of the serpentine walls, and that the crystals (fibres) have grown outwards from the original crevices which are now represented by partings of iron ore found near the centre of the veins.
Page 237 - No candles shall be left burning in a mine, or any part of a mine, when the person using the candle departs from his work for the day.
Page 105 - Found in places where no capital and but little labor were needed to get it, the poorest have been able to avail themselves of its benefits. Lands which, in the old style of cultivation, had to lie fallow, by the use of marl produce heavy crops of clover, and grow rich while resting. Thousands of acres of land, which had been worn out and left in commons, are now, by the use of this fertilizer, yielding crops of the finest quality.
Page 105 - The marl which has been described in the preceding pages has been of incalculable value to the country in which it is found. It has raised it from the lowest stage of agricultural exhaustion to a high state of improvement.
Page 154 - The normal slope that earth of a clayey nature will take is about 1 to 1. Sandy ground requires 1% to 1 or even 2 to 1, while rock can be cut nearly vertically if the height of bank does not exceed one shovel cut. For greater depths, % to 1 must be allowed or even 1 to 1 if the rock is of a shaley nature.