-The methods of extraction of gold placer in the world: depends on the distribution characteristics and geological structure that has methods like extraction methods open-pits, most gold is mined by Placer mining method, and then return to the base metal, ore to gold or glass favors in-ore mine extraction of the Gold Cup, by chemicals. Placer ore in the topography of mounds, hills can exploit and transfer to the central collection or system of recruiting maneuver. Placer ore Lake, River, can use the type of mining technology with the power associated with the system on the float or clusters of attached mobile device system of gravity.-The gold Placer mining method in Vietnam: tapping technology also backward, effective training, not higher enrolment. The technology is still sketchy, mostly conducted by the method of gravity.+ Favors > Crystal favors-Trough-> recovered by mercury or furnace should also lower recovery efficiency. Placer gold recovery rate of 45-50% of the original gold mine, 30-40%. (the map represented the mines
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