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Htan-yan-sho, Pein-Pyit (Painpyit; Pyan Pyit), Mogok Township, Pyin-Oo-Lwin District, Mandalay Region (Mandalay Division), Myanmar

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Latitude & Longitude (WGS84): 22° 57' 43'' North , 96° 32' 45'' East
Latitude & Longitude (decimal): 22.96194,96.54583
Köppen climate type:Cwa : Monsoon-influenced humid subtropical climate
Other/historical region names associated with this locality:Burma

This mining area was known before the 1970s. It is situated about 8 km from Mogok town, between Dattaw in the south-west and Pein-pyit village in the north-east. It is close to the Mogok-Momeik road, forming a natural basin where many gems have accumulated. Another mining area is situated at the base of a marble faulted scarp in contact with garnet-bearing gneiss; leucogranite rocks and several skarns are also known in the same area. For many years gems have been mined in the loos (loo-dwin) situated in the adjacent hill.
In 2001 these mines produced mostly spinels (60%), near-colorless, greenish-blue, purple and other colored sapphires (10%), rubies (5%), other gemstones (25%). In 2004, most gems mined were blue or blue/green sapphires, fewer of fine quality; also some rubies. Other gems found iclude quartz, tourmaline, moonstone, near-colorless to yellowish and greenish chrysoberyl, danburite, topaz, zircon, diopside, fibrolite, amblygonite/montebrasite and andalusite. Vivid green grossular suitable for cutting brilliant gems below 2 carats were also recovered.
Most of the gems are found in sandy byôn using open-pit mining methods. Blue and blue-green sapphires, some milky-silky are also found in the alluvium and they are similar to those found at Pyant-gyi. Some of these sapphires are suitable for heat-treatment to enchance their color and increase their transparency. Rubies and spinels are found in the adjacent primary marble deposits. - Ted Themelis (2008) Gems and Mines of Mogok

Mineral List

12 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

541 - 4000 Ma

ID: 1380786
Precambrian intrusive and metamorphic terranes

Age: Precambrian (541 - 4000 Ma)

Comments: Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.

Lithology: Intrusive and metamorphic terranes

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Ted Themelis (2008) Gems and Mines of Mogok

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