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Definition of myaw-dwin

A mining method used for gem mining in Burma.
On selected hillsides, or between slopes, workers dig openings to remove the topsoil, stones and boulders to locate and expose the byôn (gem-bearing alluvium). These openings are dug in the form of downhill channels. Water runs continuously from the hilltop through the channels to the bottom of the hill, washing the byôn and breaking it down. The gem-bearing concentrate is eventually directed into above ground washing pits situated at the bottom of these channels. In small scale mining operations the byôn is taken to the nearby stream for washing.

Nowadays high pressure water cannon are used.

Ref: Ted Themelis (2008) Gems and Mines of Mogok
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