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Day and night the low thunder of the powerful batteries told of the milling of hundreds of tons; and the great concentrator, sprawling down on the broad hillside, washed out the copper and separated it from the muck.
This operation is repeated over and over again; but the stuff which is fine enough to go to the concentrator is removed by sieving after each operation of the kind; and the successive rolls or other crushers are set to a finer and finer gauge, so that there is a progressive approach to the conditions of coarse sand, which is that specially desired by the ore-dresser.
It operates four completely equipped mines which produced nearly 30,000 tons of copper in 1917, and a smelter with an annual capacity of 40,000 tons of copper. A concentrator capable of handling 4,000 tons of ore per day is nearing completion. This bustling industrial community was the second surprise that the Congo disclosed.
"Very fine ore, so far as I can judge," said Van Dorn carelessly, "I would like to see it run through that concentrator and amalgamator of mine; if these men ever get through talking about mines, Mr. Rivers, I must get you and Mr. Blaisdell interested in my machinery." At the suggestion of Mr. Lindlay, the party next paid a visit to the Morning Star mine, that being the one which Mr.
The blanket table is, however, a very unsatisfactory concentrator at best, and is giving place to mechanical concentrators of various descriptions. An ancient Egyptian gold washing table was used by the Egyptians in treating the gold ores of Lower Egypt.
Welsbach, has discovered a composition which is as good a non-conductor that is to say concentrator of heat as platinum, is much more durable, and a great deal cheaper.
During the last few days the miners had been at work blasting the quartz, and as soon as the stamps and machinery were in position they were ready to begin. The men were all told off to various duties, some to carry the rock down to the stamps, others to break it up into convenient sizes; two men fed the stamps, others attended to the concentrator and blankets, supervised by Harry.
The experiments of Kircher showed him the necessity of employing a sort of concentrator in order to increase the force of the wind, and to obtain all the advantage possible from the current of air that was directed against the strings. The place where the instrument is located should not, according to him, be exposed to the open air, but must be a closed one.
Next they would learn that a new herd of Galloways had done finely last season on the Bitter Root ranch; that a big lot of ore was sacked at the Irish Boy, that an eighteen-inch vein had been struck in the Old Crow; that a concentrator was needed at Hellandgone, and that rich gold-bearing copper and sand bearing free gold had been found over on Horseback Ridge.
"But a more effective weapon, if these men are as I expect them to be, will be a peculiarly effective magnetic field concentrator device, which will project a magnetic field as a beam for a mile or more. How useful it will be I don't know. We don't know what the enemy will turn against us!"
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