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Updated: May 21, 2025
It is called by the miners the cascalho, and consists of loose gravel, the pebbles of which are rounded and polished, having at some previous era been subject to the action of running water. The bed varies in thickness from one to four feet and the pebbles are of various kinds; but when there are many of a species called Esmerilo preto, the cascalho is considered to be rich in diamonds.
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