This mining area is situated in a small valley (at the 9th milepost Mogok-Momeik road), north of the Pein-pyit village. Since November 2003, a small team of miners was working an open-pit deposit mining spinel
and other gems found in samyay byôn
from the alluvium. Most of these gems are small and of low quality.
Further north and north-east of the village of Pein-pyit, more gems and minerals are found. At Loi-sau mountain situated about 3 km east of the Pein-pyit village, gem-quality jeremejevite
crystals are found. In 2005, a faceted 4.53 carats yellowish jeremejevite was sold at Htar-Pwe, the main gem market in Mogok.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 193