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Many indications have been found, and it is inevitable that they will be located in time. The diamond-bearing earth sometimes travels very far from its base, and the American engineers in the Congo with whom I talked are convinced that these volcanic formations which usually produce large stones, lie far up in the Kasai hills.
In all of the deep mines the laborers are taken up and down the shafts in cages. The method of mining and working the diamond-bearing earth at present employed is far more economical than in former years. After the blue material has been brought up it is carried to the depositing floors where it is allowed to remain several months. In the meanwhile it is harrowed several times to break the lumps.
Lawns were laid out and vines and trees planted about the houses, making the dusty, wind-swept expanse a thing of beauty and comfort. At length prospectors learned that the diamond-bearing earth was confined chiefly to several oval-shaped funnels, ranging in area from ten to twenty acres, and that outside these few diamonds were to be found.
The diamond-bearing area of the Belgian Congo and Angola covers nearly eight thousand square miles and only five per cent has been prospected. There is not the slightest doubt that one of the greatest diamond fields ever known is in the making here. Now for a real human interest detail. At Kimberley the Zulus and Kaffirs know the value of the diamond and there was formerly considerable filching.
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