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Silica - USGS Besides silica sand, various silica stones were used as abrasive material The value of grindstones produced in 1900 was $710,000, breaking the old record set in 1882 The production of infusorial earth and tripoli was 3,280 tons , improve recovery in oil wells Additionally, electronic-grade
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Can You Extract Gold from Black Sand? — Reclaim, , If you live in an area with large deposits of black-colored sand, are you sitting on tons of gold that you can refine? Or if you work for a mining company that pulverizes minerals and ends up with quantities of black sand, it is likely to contain quantities of gold that are worth extracting?
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PURE GOLD AND IRON FROM SAND - Elmer R Gates M’Govern, C Montgomery “Pure Gold and Iron from Sand” Pearson's Magazine, date unknown, pp 181-185 (On the copy of this article in ,
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