It is a sinkhole, noted with prominent karst topography, caves and loos (twisted holes). Some of these loos are connected to the other loos at Dan-dagu-taung.
Rubies, diopsides and spinels were recovered from the byôn, which was brought out from the loos using powerful pumps and washed on the small valley floor.
By 2001 the deposit was depleted.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 238