Frequently they doubled as goldsmiths and were required to separateauriferoussilver from base metal.
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Auriferousquartz veins were subsequently found in surface exposures at the site of the current open pit.
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In the adjacent region to the locality there are considerable nonauriferousmineral deposits.
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This basalt has been subjected to biotite-carbonate alteration andauriferoussilicification.
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Two types of mineralization exist, one type beingauriferousquartz-carbonate veins with combinations of pyrite, galena, sphalerite and chalcopyrite present.
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The broad gravel flood plain in this part of the basin is said to beauriferous.
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This action was of economic importance, since it prevents accumulations ofauriferousgravels within areas in which it operatesa fact which was proved by prospecting.
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The basin's lake beds areauriferous.
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