United States or Djibouti ? Vote for the TOP Country of the Week !
Some copper can be taken out of the mortars at once, but the rest of the broken gangue is fed to jigs, or screens, which are kept under jets of water. The water is thrown up from below and the lighter rock is tossed away, while the heavier copper falls through the tiny holes in the screens.
In their ignorance they knew nothing of which way the vein "dipped", of what the "gangue" was composed, nor how often and where "faults" occurred. The question in hand was the presence of gold and the length, width, and depth of the quartz lode. The gold was really there in pretty yellow streaks and spots, shining brightly in whichever way it was turned. Of course Roberts claimed the discovery.
In the midst of a mass of blackish debris, a, organic and inorganic, and immersed in an amorphous and transparent gangue, we find a few recognizable fragments, such as thick-walled macrospores, b, of various sizes, bits of flattened petioles, c, pollen grains, d, debris of bark, etc.
For general purposes, where the gangue has not been crushed too fine, I think the Duncan pan will usually be found effective in saving the concentrates. In theory it is an enlargement of the alluvial miner's tin dish, and the motion imparted to it is similar to the eccentric motion of that simple separator.
I was lately consulted with respect to the treatment of a pyritic ore in a very promising mine, but could not recommend the above treatment, because though the pyrites in the gangue was similar, the bulk of the lode consisted of silica, consequently there would be a great waste of power in triturating the whole of the stuff to what, with regard to much of it, would be an unnecessary degree of fineness.
Side, and Some ash timber in the high bottoms. the river has more Sand bars today than usial, and more Soft mud. the current less rapid. at 2 P.M. I was obliged to land to let the Buffalow Cross over. not withstanding an island of half a mile in width over which this gangue of Buffalow had to pass and the Chanel of the river on each Side nearly 1/4 of a mile in width, this gangue of Buffalow was entirely across and as thick as they could Swim. the Chanel on the Side of the island the went into the river was crouded with those animals for 1/2 an hour. the other Side of the island for more than 3/4 of an hour.
To pay railroad charges on ores carrying perhaps 80 to 90 per cent. of useless material would be prohibitive. Hence the elimination of the worthless "gangue" by concentration of the iron particles associated with it, seemed to be the only solution of the problem.
In the clear light a sheen glittered over those portions of the ledge where its surface had been freshly abraded by the mass of rock grinding over it in the avalanche's descent; it was indubitably quartz, quartz in place, the only body of it found in situ so far on that mountain. His rich float had been of quartz gangue!
"'E gone at Doctah Kin." "I do not need Doctor Keene; I am not badly hurt. Raoul should not have left you here in this manner. You must not stay." "Bud, 'Sieur Frowenfel', I am afred to paz dad gangue!" A new distress seized Joseph in view of this additional complication. But, unmindful of this suggestion, the fair Creole suddenly exclaimed: "'Sieu' Frowenfel', you har a hinnocen' man!
In general practice I have seldom found 1000 gallons per hour more than sufficient. As to the most effective mesh for the screen or grating no definite rule can be given, as that depends so largely on the size of the gold particles contained in the gangue.
Word Of The Day