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dry blowing : ウィキペディア英語版
dry blowing
Dry blowing is a method to extract gold particles from dry soil without the use of water. It is a form of winnowing.
==Methods==

*One method is to pour dry soil from a height into a pan, allowing the wind to blow away finer dust. The denser gold particles to fall into the pan.〔(Swirk: Success of early mining methods )〕
*Alternatively, the prospector would use one pan and throw dirt up into the air and catch it.〔(Geology.com: Gold Prospecting - Alluvial & General )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「dry blowing」の詳細全文を読む



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