This mining area is located just south of Ohn-bin. Ruby
, star ruby
, blue sapphire
, color-change sapphire, star sapphire
are found in the alluvium and they are mined by open-pit methods. These gems are of faceting and cabochon grade, mostly of small size.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 208