The mining area of Yebu-kalar-gon (Indians in Hot Water) is situated west of the main water pipe passing through the Yebu valley. Several joint venture companies are engaged in mining the soft, sandy alluvium using small scale open-pit and lebin
mining methods. Most of the gems recovered are rubies
, some blue sapphires
. Star rubies
and star sapphires
of good quality are often found.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 221