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the evolution of alluvial gold beneficiation technology in vietnam

The ruby was found in colluvial and alluvial sediments and the primary source was believed to be marble Gem exploitation began in earnest in June 1988 with the establishment of VINAGEMCO Vietnam Gemstones Company a stateowned company for ...As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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